Merge branch 'master' of https://github.com/vikasrajput6035/tutorials into BAEL-3832

algorithms-searching/README.md

@@ -10,3 +10,4 @@ This module contains articles about searching algorithms.
 - [String Search Algorithms for Large Texts](https://www.baeldung.com/java-full-text-search-algorithms)
 - [Monte Carlo Tree Search for Tic-Tac-Toe Game](https://www.baeldung.com/java-monte-carlo-tree-search)
 - [Range Search Algorithm in Java](https://www.baeldung.com/java-range-search)
+- [Fast Pattern Matching of Strings Using Suffix Tree](https://www.baeldung.com/java-pattern-matching-suffix-tree)

apache-beam/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Introduction to Apache Beam](https://www.baeldung.com/apache-beam)

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

@@ -5,3 +5,5 @@ This module contains articles about Java 14.
 ### Relevant articles
 
 - [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)
+- [Java Text Blocks](https://www.baeldung.com/java-text-blocks)
+- [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)

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

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Arrays.deepEquals](https://www.baeldung.com/java-arrays-deepequals)

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

@@ -7,3 +7,5 @@ This module contains articles about core java exceptions
 - [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
 - [Wrapping vs Rethrowing Exceptions in Java](https://www.baeldung.com/java-wrapping-vs-rethrowing-exceptions)
 - [java.net.UnknownHostException: Invalid Hostname for Server](https://www.baeldung.com/java-unknownhostexception)
+- [How to Handle Java SocketException](https://www.baeldung.com/java-socketexception)
+- [Java Suppressed Exceptions](https://www.baeldung.com/java-suppressed-exceptions)

core-java-modules/core-java-io-2/pom.xml

@@ -47,6 +47,14 @@
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/com.github.tomakehurst/wiremock -->
+        <dependency>
+            <groupId>com.github.tomakehurst</groupId>
+            <artifactId>wiremock</artifactId>
+            <version>2.26.3</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>

core-java-modules/core-java-io-2/src/test/java/com/baeldung/blockingnonblocking/BlockingClientUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.blockingnonblocking;
+
+import com.github.tomakehurst.wiremock.junit.WireMockRule;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.io.*;
+import java.net.Socket;
+
+import static com.github.tomakehurst.wiremock.client.WireMock.*;
+import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.wireMockConfig;
+import static org.junit.Assert.assertTrue;
+
+public class BlockingClientUnitTest {
+    private static final String REQUESTED_RESOURCE = "/test.json";
+
+    @Rule public WireMockRule wireMockRule = new WireMockRule(wireMockConfig().dynamicPort());
+
+    @Before
+    public void setup() {
+        stubFor(get(urlEqualTo(REQUESTED_RESOURCE)).willReturn(aResponse()
+          .withStatus(200)
+          .withBody("{ \"response\" : \"It worked!\" }\r\n\r\n")));
+    }
+
+    @Test
+    public void givenJavaIOSocket_whenReadingAndWritingWithStreams_thenSuccess() throws IOException {
+        // given an IO socket and somewhere to store our result
+        Socket socket = new Socket("localhost", wireMockRule.port());
+        StringBuilder ourStore = new StringBuilder();
+
+        // when we write and read (using try-with-resources so our resources are auto-closed)
+        try (InputStream serverInput = socket.getInputStream();
+          BufferedReader reader = new BufferedReader(new InputStreamReader(serverInput));
+          OutputStream clientOutput = socket.getOutputStream();
+          PrintWriter writer = new PrintWriter(new OutputStreamWriter(clientOutput))) {
+            writer.print("GET " + REQUESTED_RESOURCE + " HTTP/1.0\r\n\r\n");
+            writer.flush(); // important - without this the request is never sent, and the test will hang on readLine()
+
+            for (String line; (line = reader.readLine()) != null; ) {
+                ourStore.append(line);
+                ourStore.append(System.lineSeparator());
+            }
+        }
+
+        // then we read and saved our data
+        assertTrue(ourStore
+          .toString()
+          .contains("It worked!"));
+    }
+}

core-java-modules/core-java-io-2/src/test/java/com/baeldung/blockingnonblocking/NonBlockingClientUnitTest.java

@@ -0,0 +1,94 @@
+package com.baeldung.blockingnonblocking;
+
+import com.github.tomakehurst.wiremock.junit.WireMockRule;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.channels.SocketChannel;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.StandardCharsets;
+
+import static com.github.tomakehurst.wiremock.client.WireMock.*;
+import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.wireMockConfig;
+import static org.junit.Assert.assertTrue;
+
+public class NonBlockingClientUnitTest {
+    private String REQUESTED_RESOURCE = "/test.json";
+
+    @Rule public WireMockRule wireMockRule = new WireMockRule(wireMockConfig().dynamicPort());
+
+    @Before
+    public void setup() {
+        stubFor(get(urlEqualTo(REQUESTED_RESOURCE)).willReturn(aResponse()
+          .withStatus(200)
+          .withBody("{ \"response\" : \"It worked!\" }")));
+    }
+
+    @Test
+    public void givenJavaNIOSocketChannel_whenReadingAndWritingWithBuffers_thenSuccess() throws IOException {
+        // given a NIO SocketChannel and a charset
+        InetSocketAddress address = new InetSocketAddress("localhost", wireMockRule.port());
+        SocketChannel socketChannel = SocketChannel.open(address);
+        Charset charset = StandardCharsets.UTF_8;
+
+        // when we write and read using buffers
+        socketChannel.write(charset.encode(CharBuffer.wrap("GET " + REQUESTED_RESOURCE + " HTTP/1.0\r\n\r\n")));
+
+        ByteBuffer byteBuffer = ByteBuffer.allocate(8192); // or allocateDirect if we need direct memory access
+        CharBuffer charBuffer = CharBuffer.allocate(8192);
+        CharsetDecoder charsetDecoder = charset.newDecoder();
+        StringBuilder ourStore = new StringBuilder();
+        while (socketChannel.read(byteBuffer) != -1 || byteBuffer.position() > 0) {
+            byteBuffer.flip();
+            storeBufferContents(byteBuffer, charBuffer, charsetDecoder, ourStore);
+            byteBuffer.compact();
+        }
+        socketChannel.close();
+
+        // then we read and saved our data
+        assertTrue(ourStore
+          .toString()
+          .contains("It worked!"));
+    }
+
+    @Test
+    public void givenJavaNIOSocketChannel_whenReadingAndWritingWithSmallBuffers_thenSuccess() throws IOException {
+        // given a NIO SocketChannel and a charset
+        InetSocketAddress address = new InetSocketAddress("localhost", wireMockRule.port());
+        SocketChannel socketChannel = SocketChannel.open(address);
+        Charset charset = StandardCharsets.UTF_8;
+
+        // when we write and read using buffers that are too small for our message
+        socketChannel.write(charset.encode(CharBuffer.wrap("GET " + REQUESTED_RESOURCE + " HTTP/1.0\r\n\r\n")));
+
+        ByteBuffer byteBuffer = ByteBuffer.allocate(8); // or allocateDirect if we need direct memory access
+        CharBuffer charBuffer = CharBuffer.allocate(8);
+        CharsetDecoder charsetDecoder = charset.newDecoder();
+        StringBuilder ourStore = new StringBuilder();
+        while (socketChannel.read(byteBuffer) != -1 || byteBuffer.position() > 0) {
+            byteBuffer.flip();
+            storeBufferContents(byteBuffer, charBuffer, charsetDecoder, ourStore);
+            byteBuffer.compact();
+        }
+        socketChannel.close();
+
+        // then we read and saved our data
+        assertTrue(ourStore
+          .toString()
+          .contains("It worked!"));
+    }
+
+    void storeBufferContents(ByteBuffer byteBuffer, CharBuffer charBuffer, CharsetDecoder charsetDecoder, StringBuilder ourStore) {
+        charsetDecoder.decode(byteBuffer, charBuffer, true);
+        charBuffer.flip();
+        ourStore.append(charBuffer);
+        charBuffer.clear();
+    }
+
+}

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

@@ -9,4 +9,5 @@ This module contains articles about core features in the Java language
 - [Java Default Parameters Using Method Overloading](https://www.baeldung.com/java-default-parameters-method-overloading)
 - [How to Return Multiple Values From a Java Method](https://www.baeldung.com/java-method-return-multiple-values)
 - [Guide to the Java finally Keyword](https://www.baeldung.com/java-finally-keyword)
+- [The Java Headless Mode](https://www.baeldung.com/java-headless-mode)
 - [[<-- Prev]](/core-java-modules/core-java-lang)

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

@@ -8,4 +8,5 @@ This module contains articles about core Java non-blocking input and output (IO)
 - [Create a Symbolic Link with Java](https://www.baeldung.com/java-symlink)
 - [Introduction to the Java NIO Selector](https://www.baeldung.com/java-nio-selector)
 - [Using Java MappedByteBuffer](https://www.baeldung.com/java-mapped-byte-buffer)
-- [[<-- Prev]](/core-java-modules/core-java-nio)
+- [How to Lock a File in Java](https://www.baeldung.com/java-lock-files)
+- [[<-- Prev]](/core-java-modules/core-java-nio)

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

@@ -10,3 +10,4 @@ This module contains articles about performance of Java applications
 - [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
 - [Monitoring Java Applications with Flight Recorder](https://www.baeldung.com/java-flight-recorder-monitoring)
 - [Branch Prediction in Java](https://www.baeldung.com/java-branch-prediction)
+- [Capturing a Java Thread Dump](https://www.baeldung.com/java-thread-dump)

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

@@ -8,3 +8,4 @@
 - [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
 - [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)
 - [Difference Between Java Matcher find() and matches()](https://www.baeldung.com/java-matcher-find-vs-matches)
+- [How to Use Regular Expressions to Replace Tokens in Strings](https://www.baeldung.com/java-regex-token-replacement)

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

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Guide To The Java Authentication And Authorization Service (JAAS)](https://www.baeldung.com/java-authentication-authorization-service)

core-java-modules/core-java-string-operations-2/README.md

@@ -10,4 +10,5 @@ This module contains articles about string operations.
 - [Java String equalsIgnoreCase()](https://www.baeldung.com/java-string-equalsignorecase)
 - [Case-Insensitive String Matching in Java](https://www.baeldung.com/java-case-insensitive-string-matching)
 - [L-Trim and R-Trim in Java](https://www.baeldung.com/l-trim-and-r-trim-in-java)
+- [L-Trim and R-Trim Alternatives in Java](https://www.baeldung.com/java-trim-alternatives)
 - More articles: [[<-- prev]](../core-java-string-operations)

data-structures/README.md

@@ -9,3 +9,4 @@ This module contains articles about data structures in Java
 - [Circular Linked List Java Implementation](https://www.baeldung.com/java-circular-linked-list)
 - [How to Print a Binary Tree Diagram](https://www.baeldung.com/java-print-binary-tree-diagram)
 - [Introduction to Big Queue](https://www.baeldung.com/java-big-queue)
+- [Guide to AVL Trees in Java](https://www.baeldung.com/java-avl-trees)

ddd-modules/README.md

@@ -1 +1,3 @@
-## Relevant Articles
+### Relevant Articles:
+
+- [DDD Bounded Contexts and Java Modules](https://www.baeldung.com/java-modules-ddd-bounded-contexts)

gradle-6/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [What’s New in Gradle 6.0](https://www.baeldung.com/gradle-6-features)

gradle/gradle-to-maven/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Converting Gradle Build File to Maven POM](https://www.baeldung.com/gradle-build-to-maven-pom)

gson/README.md

@@ -13,4 +13,4 @@ This module contains articles about Gson
 - [Convert String to JsonObject with Gson](https://www.baeldung.com/gson-string-to-jsonobject)
 - [Mapping Multiple JSON Fields to a Single Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)
 - [Serializing and Deserializing a List with Gson](https://www.baeldung.com/gson-list)
-
+- [Compare Two JSON Objects with Gson](https://www.baeldung.com/gson-compare-json-objects)

image-processing/README.md

@@ -4,3 +4,5 @@ This module contains articles about image processing.
 
 ### Relevant Articles:
 - [Working with Images in Java](https://www.baeldung.com/java-images)
+- [Intro to OpenCV with Java](https://www.baeldung.com/java-opencv)
+- [Optical Character Recognition with Tesseract](https://www.baeldung.com/java-ocr-tesseract)

java-numbers-3/README.md

@@ -2,3 +2,4 @@
 
 - [Generating Random Numbers](https://www.baeldung.com/java-generating-random-numbers)
 - [Convert Double to Long in Java](https://www.baeldung.com/java-convert-double-long)
+- [Check for null Before Calling Parse in Double.parseDouble](https://www.baeldung.com/java-check-null-parse-double)

jee-7/src/test/java/com/baeldung/batch/understanding/CustomCheckPointUnitTest.java

@@ -12,7 +12,9 @@ import javax.batch.runtime.StepExecution;
 import com.baeldung.batch.understanding.BatchTestHelper;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Disabled;
 
+@Disabled("Should be fixed in BAEL-3812")
 class CustomCheckPointUnitTest {
     @Test
     public void givenChunk_whenCustomCheckPoint_thenCommitCountIsThree() throws Exception {

jee-7/src/test/java/com/baeldung/batch/understanding/JobSequenceUnitTest.java

@@ -13,7 +13,9 @@ import javax.batch.runtime.JobExecution;
 import javax.batch.runtime.StepExecution;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Disabled;
 
+@Disabled("Should be fixed in BAEL-3812")
 class JobSequenceUnitTest {
     @Test
     public void givenTwoSteps_thenBatch_CompleteWithSuccess() throws Exception {

jee-7/src/test/java/com/baeldung/batch/understanding/SimpleChunkUnitTest.java

@@ -14,7 +14,9 @@ import javax.batch.runtime.Metric;
 import javax.batch.runtime.StepExecution;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Disabled;
 
+@Disabled("Should be fixed in BAEL-3812")
 class SimpleChunkUnitTest {
     @Test
     public void givenChunk_thenBatch_CompletesWithSucess() throws Exception {

json-2/README.md

@@ -4,3 +4,4 @@ This module contains articles about JSON.
 
 ### Relevant Articles:
 - [Introduction to Jsoniter](https://www.baeldung.com/java-jsoniter)
+- [Introduction to Moshi Json](https://www.baeldung.com/java-json-moshi)

libraries-3/README.md

@@ -12,3 +12,7 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Guide to the Cactoos Library](https://www.baeldung.com/java-cactoos)
 - [Parsing Command-Line Parameters with Airline](https://www.baeldung.com/java-airline)
 - [Introduction to cache2k](https://www.baeldung.com/java-cache2k)
+- [Introduction to the jcabi-aspects AOP Annotations Library](https://www.baeldung.com/java-jcabi-aspects)
+- [Introduction to Takes](https://www.baeldung.com/java-takes)
+- [Using NullAway to Avoid NullPointerExceptions](https://www.baeldung.com/java-nullaway)
+

libraries-3/pom.xml

@@ -94,6 +94,23 @@
             <artifactId>velocity-engine-core</artifactId>
             <version>${velocity-engine-core.version}</version>
         </dependency>
+          <dependency>
+            <groupId>com.uber.nullaway</groupId>
+            <artifactId>nullaway</artifactId>
+            <version>0.3.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-compiler-javac-errorprone</artifactId>
+            <version>2.8</version>
+        </dependency>
+        <!-- override plexus-compiler-javac-errorprone's dependency on
+             Error Prone with the latest version -->
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_core</artifactId>
+            <version>2.1.3</version>
+        </dependency>
     </dependencies>
 
     <repositories>
@@ -130,6 +147,45 @@
                     </dependency>
                 </dependencies>
             </plugin>
+               <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5</version>
+                <configuration>
+                    <compilerId>javac-with-errorprone</compilerId>
+                    <forceJavacCompilerUse>true</forceJavacCompilerUse>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                    <showWarnings>true</showWarnings>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>com.uber.nullaway</groupId>
+                            <artifactId>nullaway</artifactId>
+                            <version>0.3.0</version>
+                        </path>
+                    </annotationProcessorPaths>
+                    <compilerArgs>
+                        <!-- NullAway will warn by default, uncomment the next line to make the build fail -->
+                        <!-- <arg>-Xep:NullAway:ERROR</arg> -->
+                        <arg>-XepExcludedPaths:(.*)/test/.*|(.*)/jcabi/.*</arg>
+                        <arg>-XepOpt:NullAway:AnnotatedPackages=com.baeldung.nullaway</arg>
+                    </compilerArgs>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.codehaus.plexus</groupId>
+                        <artifactId>plexus-compiler-javac-errorprone</artifactId>
+                        <version>2.8</version>
+                    </dependency>
+                    <!-- override plexus-compiler-javac-errorprone's dependency on
+                         Error Prone with the latest version -->
+                    <dependency>
+                        <groupId>com.google.errorprone</groupId>
+                        <artifactId>error_prone_core</artifactId>
+                        <version>2.3.4</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
         </plugins>
         <resources>
             <resource>

libraries-3/src/main/java/com/baeldung/nullaway/NullAwayExample.java

@@ -1,7 +1,5 @@
 package com.baeldung.nullaway;
 
-import com.baeldung.distinct.Person;
-
 public class NullAwayExample {
 
     /*

libraries-3/src/main/java/com/baeldung/nullaway/Person.java

@@ -0,0 +1,65 @@
+package com.baeldung.nullaway;
+
+public class Person {
+    int age;
+    String name;
+    String email;
+
+    public Person(int age, String name, String email) {
+        super();
+        this.age = age;
+        this.name = name;
+        this.email = email;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("Person [age=");
+        builder.append(age);
+        builder.append(", name=");
+        builder.append(name);
+        builder.append(", email=");
+        builder.append(email);
+        builder.append("]");
+        return builder.toString();
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((email == null) ? 0 : email.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Person other = (Person) obj;
+        if (email == null) {
+            if (other.email != null)
+                return false;
+        } else if (!email.equals(other.email))
+            return false;
+        return true;
+    }
+
+}

libraries-data-io/README.md

@@ -9,3 +9,4 @@ This module contains articles about IO data processing libraries.
 - [Introduction To OpenCSV](https://www.baeldung.com/opencsv)
 - [Interact with Google Sheets from Java](https://www.baeldung.com/google-sheets-java-client)
 - [Introduction To Docx4J](https://www.baeldung.com/docx4j)
+- [Breaking YAML Strings Over Multiple Lines](https://www.baeldung.com/yaml-multi-line)

libraries/pom.xml

@@ -435,23 +435,6 @@
             <artifactId>reflections</artifactId>
             <version>${reflections.version}</version>
         </dependency>
-        <dependency>
-            <groupId>com.uber.nullaway</groupId>
-            <artifactId>nullaway</artifactId>
-            <version>0.3.0</version>
-        </dependency>
-        <dependency>
-            <groupId>org.codehaus.plexus</groupId>
-            <artifactId>plexus-compiler-javac-errorprone</artifactId>
-            <version>2.8</version>
-        </dependency>
-        <!-- override plexus-compiler-javac-errorprone's dependency on
-             Error Prone with the latest version -->
-        <dependency>
-            <groupId>com.google.errorprone</groupId>
-            <artifactId>error_prone_core</artifactId>
-            <version>2.1.3</version>
-        </dependency>
     </dependencies>
 
     <repositories>
@@ -569,46 +552,6 @@
                 </executions>
             </plugin>
 
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.5</version>
-                <configuration>
-                    <compilerId>javac-with-errorprone</compilerId>
-                    <forceJavacCompilerUse>true</forceJavacCompilerUse>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                    <showWarnings>true</showWarnings>
-                    <annotationProcessorPaths>
-                        <path>
-                            <groupId>com.uber.nullaway</groupId>
-                            <artifactId>nullaway</artifactId>
-                            <version>0.3.0</version>
-                        </path>
-                    </annotationProcessorPaths>
-                    <compilerArgs>
-                        <!-- NullAway will warn by default, uncomment the next line to make the build fail -->
-                        <!-- <arg>-Xep:NullAway:ERROR</arg> -->
-                        <arg>-XepExcludedPaths:(.*)/test/.*|(.*)/streamex/.*</arg>
-                        <arg>-XepOpt:NullAway:AnnotatedPackages=com.baeldung.nullaway</arg>
-                    </compilerArgs>
-                </configuration>
-                <dependencies>
-                    <dependency>
-                        <groupId>org.codehaus.plexus</groupId>
-                        <artifactId>plexus-compiler-javac-errorprone</artifactId>
-                        <version>2.8</version>
-                    </dependency>
-                    <!-- override plexus-compiler-javac-errorprone's dependency on
-                         Error Prone with the latest version -->
-                    <dependency>
-                        <groupId>com.google.errorprone</groupId>
-                        <artifactId>error_prone_core</artifactId>
-                        <version>2.1.3</version>
-                    </dependency>
-                </dependencies>
-            </plugin>
-
         </plugins>
     </build>
 

open-liberty/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Introduction to Open Liberty](https://www.baeldung.com/java-open-liberty)

persistence-modules/java-mongodb/README.md

@@ -9,3 +9,4 @@ This module contains articles about MongoDB in Java.
 - [MongoDB BSON Guide](https://www.baeldung.com/mongodb-bson)
 - [Geospatial Support in MongoDB](https://www.baeldung.com/mongodb-geospatial-support)
 - [Introduction to Morphia – Java ODM for MongoDB](https://www.baeldung.com/mongodb-morphia)
+- [MongoDB Aggregations Using Java](https://www.baeldung.com/java-mongodb-aggregations)

persistence-modules/spring-boot-persistence-h2/pom.xml

@@ -29,12 +29,30 @@
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-core</artifactId>
+            <version>${hibernate.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.vladmihalcea</groupId>
+            <artifactId>db-util</artifactId>
+            <version>${db-util.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
         <!-- The main class to start by executing java -jar -->
         <start-class>com.baeldung.h2db.demo.server.SpringBootApp</start-class>
         <spring-boot.version>2.0.4.RELEASE</spring-boot.version>
+        <hibernate.version>5.3.11.Final</hibernate.version>
+        <db-util.version>1.0.4</db-util.version>
     </properties>
 
 </project>

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/LazyLoadNoTransSpringBootApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.h2db.lazy_load_no_trans;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@SpringBootApplication
+@EnableTransactionManagement
+public class LazyLoadNoTransSpringBootApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(LazyLoadNoTransSpringBootApplication.class, args);
+    }
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/config/DatasourceProxyBeanPostProcessor.java

@@ -0,0 +1,67 @@
+package com.baeldung.h2db.lazy_load_no_trans.config;
+
+import net.ttddyy.dsproxy.listener.DataSourceQueryCountListener;
+import net.ttddyy.dsproxy.listener.logging.CommonsQueryLoggingListener;
+import net.ttddyy.dsproxy.listener.logging.DefaultQueryLogEntryCreator;
+import net.ttddyy.dsproxy.listener.logging.SLF4JLogLevel;
+import net.ttddyy.dsproxy.listener.logging.SLF4JQueryLoggingListener;
+import net.ttddyy.dsproxy.support.ProxyDataSource;
+import net.ttddyy.dsproxy.support.ProxyDataSourceBuilder;
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.stereotype.Component;
+import org.springframework.util.ReflectionUtils;
+
+import javax.sql.DataSource;
+import java.lang.reflect.Method;
+
+@Component
+public class DatasourceProxyBeanPostProcessor implements BeanPostProcessor {
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) {
+        if (bean instanceof DataSource && !(bean instanceof ProxyDataSource)) {
+            // Instead of directly returning a less specific datasource bean
+            // (e.g.: HikariDataSource -> DataSource), return a proxy object.
+            // See following links for why:
+            //   https://stackoverflow.com/questions/44237787/how-to-use-user-defined-database-proxy-in-datajpatest
+            //   https://gitter.im/spring-projects/spring-boot?at=5983602d2723db8d5e70a904
+            //   http://blog.arnoldgalovics.com/2017/06/26/configuring-a-datasource-proxy-in-spring-boot/
+            final ProxyFactory factory = new ProxyFactory(bean);
+            factory.setProxyTargetClass(true);
+            factory.addAdvice(new ProxyDataSourceInterceptor((DataSource) bean));
+            return factory.getProxy();
+        }
+        return bean;
+    }
+
+    @Override
+    public Object postProcessBeforeInitialization(Object bean, String beanName) {
+        return bean;
+    }
+
+    private static class ProxyDataSourceInterceptor implements MethodInterceptor {
+        private final DataSource dataSource;
+
+        public ProxyDataSourceInterceptor(final DataSource dataSource) {
+            this.dataSource = ProxyDataSourceBuilder.create(dataSource)
+                    .name("MyDS")
+                    .multiline()
+                    .logQueryBySlf4j(SLF4JLogLevel.INFO)
+                    .listener(new DataSourceQueryCountListener())
+                    .build();
+        }
+
+        @Override
+        public Object invoke(final MethodInvocation invocation) throws Throwable {
+            final Method proxyMethod = ReflectionUtils.findMethod(this.dataSource.getClass(),
+                    invocation.getMethod().getName());
+            if (proxyMethod != null) {
+                return proxyMethod.invoke(this.dataSource, invocation.getArguments());
+            }
+            return invocation.proceed();
+        }
+    }
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/entity/Document.java

@@ -0,0 +1,26 @@
+package com.baeldung.h2db.lazy_load_no_trans.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.hibernate.annotations.Immutable;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Immutable
+public class Document {
+
+    @Id
+    private Long id;
+
+    private String title;
+
+    private Long userId;
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/entity/User.java

@@ -0,0 +1,37 @@
+package com.baeldung.h2db.lazy_load_no_trans.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
+import org.hibernate.annotations.Immutable;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Immutable
+public class User {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    private String comment;
+
+    @OneToMany(mappedBy = "userId")
+    @Fetch(FetchMode.SUBSELECT)
+    private List<Document> docs = new ArrayList<>();
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/repository/UserRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.h2db.lazy_load_no_trans.repository;
+
+import com.baeldung.h2db.lazy_load_no_trans.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/lazy_load_no_trans/service/ServiceLayer.java

@@ -0,0 +1,34 @@
+package com.baeldung.h2db.lazy_load_no_trans.service;
+
+import com.baeldung.h2db.lazy_load_no_trans.entity.User;
+import com.baeldung.h2db.lazy_load_no_trans.repository.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Collection;
+
+@Service
+public class ServiceLayer {
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Transactional(readOnly = true)
+    public long countAllDocsTransactional() {
+        return countAllDocs();
+    }
+
+    public long countAllDocsNonTransactional() {
+        return countAllDocs();
+    }
+
+    private long countAllDocs() {
+        return userRepository.findAll()
+            .stream()
+            .map(User::getDocs)
+            .mapToLong(Collection::size)
+            .sum();
+    }
+
+}

persistence-modules/spring-boot-persistence-h2/src/main/resources/application-lazy-load-no-trans-off.properties

@@ -0,0 +1,13 @@
+spring.datasource.url=jdbc:h2:mem:mydb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.hibernate.ddl-auto=create-drop
+spring.h2.console.enabled=true
+spring.h2.console.path=/h2-console
+
+logging.level.org.hibernate.SQL=INFO
+logging.level.org.hibernate.type=TRACE
+spring.jpa.properties.hibernate.validator.apply_to_ddl=false
+spring.jpa.properties.hibernate.enable_lazy_load_no_trans=false
+spring.jpa.open-in-view=false

persistence-modules/spring-boot-persistence-h2/src/main/resources/application-lazy-load-no-trans-on.properties

@@ -0,0 +1,13 @@
+spring.datasource.url=jdbc:h2:mem:mydb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.hibernate.ddl-auto=create-drop
+spring.h2.console.enabled=true
+spring.h2.console.path=/h2-console
+
+logging.level.org.hibernate.SQL=INFO
+logging.level.org.hibernate.type=TRACE
+spring.jpa.properties.hibernate.validator.apply_to_ddl=false
+spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true
+spring.jpa.open-in-view=false

persistence-modules/spring-boot-persistence-h2/src/main/resources/data.sql

@@ -10,4 +10,17 @@ CREATE TABLE billionaires (
 INSERT INTO billionaires (first_name, last_name, career) VALUES
 ('Aliko', 'Dangote', 'Billionaire Industrialist'),
 ('Bill', 'Gates', 'Billionaire Tech Entrepreneur'),
-('Folrunsho', 'Alakija', 'Billionaire Oil Magnate');
+('Folrunsho', 'Alakija', 'Billionaire Oil Magnate');
+
+insert into USER values (101, 'user1', 'comment1');
+insert into USER values (102, 'user2', 'comment2');
+insert into USER values (103, 'user3', 'comment3');
+insert into USER values (104, 'user4', 'comment4');
+insert into USER values (105, 'user5', 'comment5');
+
+insert into DOCUMENT values (1, 'doc1', 101);
+insert into DOCUMENT values (2, 'doc2', 101);
+insert into DOCUMENT values (3, 'doc3', 101);
+insert into DOCUMENT values (4, 'doc4', 101);
+insert into DOCUMENT values (5, 'doc5', 102);
+insert into DOCUMENT values (6, 'doc6', 102);

persistence-modules/spring-boot-persistence-h2/src/test/java/com/baeldung/lazy_load_no_trans/LazyLoadNoTransPropertyOffIntegrationTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.lazy_load_no_trans;
+
+import com.baeldung.h2db.lazy_load_no_trans.LazyLoadNoTransSpringBootApplication;
+import com.baeldung.h2db.lazy_load_no_trans.service.ServiceLayer;
+import com.vladmihalcea.sql.SQLStatementCountValidator;
+import org.hibernate.LazyInitializationException;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = LazyLoadNoTransSpringBootApplication.class)
+@ActiveProfiles("lazy-load-no-trans-off")
+public class LazyLoadNoTransPropertyOffIntegrationTest {
+
+    @Autowired
+    private ServiceLayer serviceLayer;
+
+    private static final long EXPECTED_DOCS_COLLECTION_SIZE = 6;
+
+    @Test(expected = LazyInitializationException.class)
+    public void whenCallNonTransactionalMethodWithPropertyOff_thenThrowException() {
+        serviceLayer.countAllDocsNonTransactional();
+    }
+
+    @Test
+    public void whenCallTransactionalMethodWithPropertyOff_thenTestPass() {
+        SQLStatementCountValidator.reset();
+
+        long docsCount = serviceLayer.countAllDocsTransactional();
+
+        assertEquals(EXPECTED_DOCS_COLLECTION_SIZE, docsCount);
+
+        SQLStatementCountValidator.assertSelectCount(2);
+    }
+}

persistence-modules/spring-boot-persistence-h2/src/test/java/com/baeldung/lazy_load_no_trans/LazyLoadNoTransPropertyOnIntegrationTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.lazy_load_no_trans;
+
+import com.baeldung.h2db.lazy_load_no_trans.LazyLoadNoTransSpringBootApplication;
+import com.baeldung.h2db.lazy_load_no_trans.service.ServiceLayer;
+import com.vladmihalcea.sql.SQLStatementCountValidator;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = LazyLoadNoTransSpringBootApplication.class)
+@ActiveProfiles("lazy-load-no-trans-on")
+public class LazyLoadNoTransPropertyOnIntegrationTest {
+
+    @Autowired
+    private ServiceLayer serviceLayer;
+
+    private static final long EXPECTED_DOCS_COLLECTION_SIZE = 6;
+    private static final long EXPECTED_USERS_COUNT = 5;
+
+    @Test
+    public void whenCallNonTransactionalMethodWithPropertyOn_thenGetNplusOne() {
+        SQLStatementCountValidator.reset();
+
+        long docsCount = serviceLayer.countAllDocsNonTransactional();
+
+        assertEquals(EXPECTED_DOCS_COLLECTION_SIZE, docsCount);
+
+        SQLStatementCountValidator.assertSelectCount(EXPECTED_USERS_COUNT + 1);
+    }
+
+    @Test
+    public void whenCallTransactionalMethodWithPropertyOn_thenTestPass() {
+        SQLStatementCountValidator.reset();
+
+        long docsCount = serviceLayer.countAllDocsTransactional();
+
+        assertEquals(EXPECTED_DOCS_COLLECTION_SIZE, docsCount);
+
+        SQLStatementCountValidator.assertSelectCount(2);
+    }
+}

persistence-modules/spring-data-jpa-4/README.md

@@ -5,6 +5,7 @@
 - [Programmatic Transaction Management in Spring](https://www.baeldung.com/spring-programmatic-transaction-management)
 - [JPA Entity Lifecycle Events](https://www.baeldung.com/jpa-entity-lifecycle-events)
 - [Working with Lazy Element Collections in JPA](https://www.baeldung.com/java-jpa-lazy-collections)
+- [Calling Stored Procedures from Spring Data JPA Repositories](https://www.baeldung.com/spring-data-jpa-stored-procedures)
 
 ### Eclipse Config 
 After importing the project into Eclipse, you may see the following error:  

persistence-modules/spring-data-neo4j/src/main/java/com/baeldung/spring/data/neo4j/config/MovieDatabaseNeo4jConfiguration.java

@@ -16,8 +16,7 @@ public class MovieDatabaseNeo4jConfiguration {
 
     @Bean
     public org.neo4j.ogm.config.Configuration getConfiguration() {
-    	org.neo4j.ogm.config.Configuration config = new Builder().uri(URL).build();
+    	return new Builder().uri(URL).build();
-        return config;
     }
 
     @Bean

persistence-modules/spring-data-redis/README.md

@@ -4,6 +4,7 @@
 - [Introduction to Spring Data Redis](https://www.baeldung.com/spring-data-redis-tutorial)
 - [PubSub Messaging with Spring Data Redis](https://www.baeldung.com/spring-data-redis-pub-sub)
 - [An Introduction to Spring Data Redis Reactive](https://www.baeldung.com/spring-data-redis-reactive)
+- [Delete Everything in Redis](https://www.baeldung.com/redis-delete-data)
 
 ### Build the Project with Tests Running
 ```

play-framework/async-http/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Asynchronous HTTP Programming with Play Framework](https://www.baeldung.com/java-play-asynchronous-http-programming)

spring-5/README.md

@@ -16,3 +16,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Spring Assert Statements](https://www.baeldung.com/spring-assert)
 - [Configuring a Hikari Connection Pool with Spring Boot](https://www.baeldung.com/spring-boot-hikari)
 - [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-amqp/README.md

@@ -7,3 +7,4 @@ This module contains articles about Spring with the AMQP messaging system
 - [Messaging With Spring AMQP](https://www.baeldung.com/spring-amqp)
 - [RabbitMQ Message Dispatching with Spring AMQP](https://www.baeldung.com/rabbitmq-spring-amqp)
 - [Error Handling with Spring AMQP](https://www.baeldung.com/spring-amqp-error-handling)
+- [Exponential Backoff With Spring AMQP](https://www.baeldung.com/spring-amqp-exponential-backoff)

spring-batch/README.md

@@ -9,3 +9,4 @@ This module contains articles about Spring Batch
 - [How to Trigger and Stop a Scheduled Spring Batch Job](https://www.baeldung.com/spring-batch-start-stop-job)
 - [Configuring Skip Logic in Spring Batch](https://www.baeldung.com/spring-batch-skip-logic)
 - [Testing a Spring Batch Job](https://www.baeldung.com/spring-batch-testing-job)
+- [Configuring Retry Logic in Spring Batch](https://www.baeldung.com/spring-batch-retry-logic)

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

@@ -10,3 +10,4 @@ This module contains articles about bootstrapping Spring Boot applications.
 - [Deploy a Spring Boot Application to OpenShift](https://www.baeldung.com/spring-boot-deploy-openshift)
 - [Deploy a Spring Boot Application to AWS Beanstalk](https://www.baeldung.com/spring-boot-deploy-aws-beanstalk)
 - [Guide to @SpringBootConfiguration in Spring Boot](https://www.baeldung.com/springbootconfiguration-annotation)
+- [Implement Health Checks in OpenShift](https://www.baeldung.com/openshift-health-checks)

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

@@ -6,4 +6,5 @@ This module contains articles about Spring Web MVC in Spring Boot projects.
 
 - [Functional Controllers in Spring MVC](https://www.baeldung.com/spring-mvc-functional-controllers)
 - [Specify an Array of Strings as Body Parameters in Swagger](https://www.baeldung.com/swagger-body-array-of-strings)
+- [Swagger @ApiParam vs @ApiModelProperty](https://www.baeldung.com/swagger-apiparam-vs-apimodelproperty)
 - More articles: [[prev -->]](/spring-boot-modules/spring-boot-mvc)

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

@@ -12,3 +12,5 @@ This module contains articles about Properties in Spring Boot.
 - [Spring YAML Configuration](https://www.baeldung.com/spring-yaml)
 - [Using Spring @Value with Defaults](https://www.baeldung.com/spring-value-defaults)
 - [How to Inject a Property Value Into a Class Not Managed by Spring?](https://www.baeldung.com/inject-properties-value-non-spring-class)
+- [Add Build Properties to a Spring Boot Application](https://www.baeldung.com/spring-boot-build-properties)
+- [IntelliJ – Cannot Resolve Spring Boot Configuration Properties Error](https://www.baeldung.com/intellij-resolve-spring-boot-configuration-properties)

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

@@ -12,3 +12,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Exclude Auto-Configuration Classes in Spring Boot Tests](https://www.baeldung.com/spring-boot-exclude-auto-configuration-test)
 - [Setting the Log Level in Spring Boot when Testing](https://www.baeldung.com/spring-boot-testing-log-level)
 - [Embedded Redis Server with Spring Boot Test](https://www.baeldung.com/spring-embedded-redis)
+- [Testing Spring Boot @ConfigurationProperties](https://www.baeldung.com/spring-boot-testing-configurationproperties)

spring-cloud/spring-cloud-gateway/README.md

@@ -5,3 +5,4 @@ This module contains articles about Spring Cloud Gateway
 ### Relevant Articles:
 - [Exploring the new Spring Cloud Gateway](http://www.baeldung.com/spring-cloud-gateway)
 - [Writing Custom Spring Cloud Gateway Filters](https://www.baeldung.com/spring-cloud-custom-gateway-filters)
+- [Spring Cloud Gateway Routing Predicate Factories](https://www.baeldung.com/spring-cloud-gateway-routing-predicate-factories)

spring-cloud/spring-cloud-zuul/README.md

@@ -5,3 +5,4 @@ This module contains articles about Spring with Netflix Zuul
 ### Relevant Articles:
 - [Rate Limiting in Spring Cloud Netflix Zuul](https://www.baeldung.com/spring-cloud-zuul-rate-limit)
 - [Spring REST with a Zuul Proxy](https://www.baeldung.com/spring-rest-with-zuul-proxy)
+- [Modifying the Response Body in a Zuul Filter](https://www.baeldung.com/zuul-filter-modifying-response-body)

spring-core-3/README.md

@@ -8,4 +8,6 @@ This module contains articles about core Spring functionality
 - [Guide to the Spring BeanFactory](https://www.baeldung.com/spring-beanfactory)
 - [How to use the Spring FactoryBean?](https://www.baeldung.com/spring-factorybean)
 - [Spring – Injecting Collections](https://www.baeldung.com/spring-injecting-collections)
+- [Design Patterns in the Spring Framework](https://www.baeldung.com/spring-framework-design-patterns)
+- [Injecting a Value in a Static Field in Spring](https://www.baeldung.com/spring-inject-static-field)
 - More articles: [[<-- prev]](/spring-core-2)

spring-ejb/ejb-beans/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Spring Bean vs. EJB – A Feature Comparison](https://www.baeldung.com/spring-bean-vs-ejb)

spring-mvc-java-2/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Cache Headers in Spring MVC](https://www.baeldung.com/spring-mvc-cache-headers)

spring-mvc-xml/README.md

@@ -17,6 +17,7 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [A Java Web Application Without a web.xml](https://www.baeldung.com/java-web-app-without-web-xml)
 - [Validating RequestParams and PathVariables in Spring](https://www.baeldung.com/spring-validate-requestparam-pathvariable)
 - [Debugging the Spring MVC 404 “No mapping found for HTTP request” Error](https://www.baeldung.com/spring-mvc-404-error)
+- [Getting Started with CRaSH](https://www.baeldung.com/jvm-crash-shell)
 
 ## Spring MVC with XML Configuration Example Project
 

spring-rest-http/README.md

@@ -12,3 +12,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Returning Custom Status Codes from Spring Controllers](https://www.baeldung.com/spring-mvc-controller-custom-http-status-code)
 - [Spring RequestMapping](https://www.baeldung.com/spring-requestmapping)
 - [Guide to DeferredResult in Spring](https://www.baeldung.com/spring-deferred-result)
+- [Using JSON Patch in Spring REST APIs](https://www.baeldung.com/spring-rest-json-patch)

spring-security-modules/spring-security-mvc-boot-1/pom.xml

@@ -222,10 +222,10 @@
     </profiles>
 
     <properties>
-        <start-class>org.baeldung.custom.Application</start-class>
+        <start-class>com.baeldung.roles.custom.Application</start-class>
         <!--If you want to run the example with the voters comment the tag 
             above and uncomment the one below -->
-        <!--<start-class>org.baeldung.voter.VoterApplication</start-class> -->
+        <!--<start-class>com.baeldung.roles.voter.VoterApplication</start-class> -->
      
         <taglibs-standard.version>1.1.2</taglibs-standard.version>
         <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/AppConfig.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.relationships;
 
 import java.util.Properties;
 
@@ -19,7 +19,7 @@ import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter
 
 @SpringBootApplication
 @PropertySource({"classpath:persistence-h2.properties", "classpath:application-defaults.properties"})
-@EnableJpaRepositories(basePackages = { "com.baeldung.data.repositories" })
+@EnableJpaRepositories(basePackages = {"com.baeldung.relationships.repositories"})
 @EnableWebMvc
 @Import(SpringSecurityConfig.class)
 public class AppConfig extends WebMvcConfigurerAdapter {
@@ -41,7 +41,7 @@ public class AppConfig extends WebMvcConfigurerAdapter {
     public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
         final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
         em.setDataSource(dataSource());
-        em.setPackagesToScan(new String[] { "com.baeldung.models" });
+        em.setPackagesToScan(new String[] { "com.baeldung.relationships.models" });
         em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
         em.setJpaProperties(additionalProperties());
         return em;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/SpringSecurityConfig.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.relationships;
 
 import javax.annotation.PostConstruct;
 import javax.sql.DataSource;
@@ -18,8 +18,8 @@ import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.security.data.repository.query.SecurityEvaluationContextExtension;
 import org.springframework.web.context.WebApplicationContext;
 
-import com.baeldung.security.AuthenticationSuccessHandlerImpl;
+import com.baeldung.relationships.security.AuthenticationSuccessHandlerImpl;
-import com.baeldung.security.CustomUserDetailsService;
+import com.baeldung.relationships.security.CustomUserDetailsService;
 
 @Configuration
 @EnableWebSecurity

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/models/AppUser.java

@@ -1,4 +1,4 @@
-package com.baeldung.models;
+package com.baeldung.relationships.models;
 
 import java.util.Date;
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/models/Tweet.java

@@ -1,4 +1,4 @@
-package com.baeldung.models;
+package com.baeldung.relationships.models;
 
 import java.util.HashSet;
 import java.util.Set;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/repositories/TweetRepository.java

@@ -1,11 +1,11 @@
-package com.baeldung.data.repositories;
+package com.baeldung.relationships.repositories;
 
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.PagingAndSortingRepository;
 
-import com.baeldung.models.Tweet;
+import com.baeldung.relationships.models.Tweet;
 
 public interface TweetRepository extends PagingAndSortingRepository<Tweet, Long> {
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/repositories/UserRepository.java

@@ -1,18 +1,15 @@
-package com.baeldung.data.repositories;
+package com.baeldung.relationships.repositories;
 
 import java.util.Date;
 import java.util.List;
 
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.query.Param;
-import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
-import com.baeldung.models.AppUser;
+import com.baeldung.relationships.models.AppUser;
 
 public interface UserRepository extends CrudRepository<AppUser, Long> {
     AppUser findByUsername(String username);

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/security/AppUserPrincipal.java

@@ -1,4 +1,4 @@
-package com.baeldung.security;
+package com.baeldung.relationships.security;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -8,7 +8,7 @@ import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
 
-import com.baeldung.models.AppUser;
+import com.baeldung.relationships.models.AppUser;
 
 public class AppUserPrincipal implements UserDetails {
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/security/AuthenticationSuccessHandlerImpl.java

@@ -1,4 +1,4 @@
-package com.baeldung.security;
+package com.baeldung.relationships.security;
 
 import java.io.IOException;
 import java.util.Date;
@@ -12,7 +12,7 @@ import org.springframework.security.core.Authentication;
 import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
 import org.springframework.stereotype.Component;
 
-import com.baeldung.data.repositories.UserRepository;
+import com.baeldung.relationships.repositories.UserRepository;
 
 @Component
 public class AuthenticationSuccessHandlerImpl implements AuthenticationSuccessHandler {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/security/CustomUserDetailsService.java

@@ -1,4 +1,4 @@
-package com.baeldung.security;
+package com.baeldung.relationships.security;
 
 import javax.annotation.PostConstruct;
 
@@ -9,8 +9,8 @@ import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 import org.springframework.web.context.WebApplicationContext;
 
-import com.baeldung.data.repositories.UserRepository;
+import com.baeldung.relationships.repositories.UserRepository;
-import com.baeldung.models.AppUser;
+import com.baeldung.relationships.models.AppUser;
 
 @Service
 public class CustomUserDetailsService implements UserDetailsService {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/relationships/util/DummyContentUtil.java

@@ -1,4 +1,4 @@
-package com.baeldung.util;
+package com.baeldung.relationships.util;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -10,8 +10,8 @@ import java.util.stream.IntStream;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 
-import com.baeldung.models.AppUser;
+import com.baeldung.relationships.models.AppUser;
-import com.baeldung.models.Tweet;
+import com.baeldung.relationships.models.Tweet;
 
 public class DummyContentUtil {
     

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/Application.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom;
+package com.baeldung.roles.custom;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -7,7 +7,7 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
-@ComponentScan("org.baeldung.custom")
+@ComponentScan("com.baeldung.roles.custom")
 @PropertySource("classpath:application-defaults.properties")
 public class Application extends SpringBootServletInitializer {
     public static void main(String[] args) {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/config/MethodSecurityConfig.java

@@ -1,7 +1,7 @@
-package org.baeldung.custom.config;
+package com.baeldung.roles.custom.config;
 
-import org.baeldung.custom.security.CustomMethodSecurityExpressionHandler;
+import com.baeldung.roles.custom.security.CustomMethodSecurityExpressionHandler;
-import org.baeldung.custom.security.CustomPermissionEvaluator;
+import com.baeldung.roles.custom.security.CustomPermissionEvaluator;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.access.expression.method.MethodSecurityExpressionHandler;
 import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/config/MvcConfig.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.config;
+package com.baeldung.roles.custom.config;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/config/SecurityConfig.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.config;
+package com.baeldung.roles.custom.config;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/SetupData.java

@@ -1,16 +1,16 @@
-package org.baeldung.custom.persistence;
+package com.baeldung.roles.custom.persistence;
 
 import java.util.Arrays;
 import java.util.HashSet;
 
 import javax.annotation.PostConstruct;
 
-import org.baeldung.custom.persistence.dao.OrganizationRepository;
+import com.baeldung.roles.custom.persistence.dao.OrganizationRepository;
-import org.baeldung.custom.persistence.dao.PrivilegeRepository;
+import com.baeldung.roles.custom.persistence.dao.PrivilegeRepository;
-import org.baeldung.custom.persistence.dao.UserRepository;
+import com.baeldung.roles.custom.persistence.dao.UserRepository;
-import org.baeldung.custom.persistence.model.Organization;
+import com.baeldung.roles.custom.persistence.model.Organization;
-import org.baeldung.custom.persistence.model.Privilege;
+import com.baeldung.roles.custom.persistence.model.Privilege;
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Component;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/dao/OrganizationRepository.java

@@ -1,6 +1,6 @@
-package org.baeldung.custom.persistence.dao;
+package com.baeldung.roles.custom.persistence.dao;
 
-import org.baeldung.custom.persistence.model.Organization;
+import com.baeldung.roles.custom.persistence.model.Organization;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface OrganizationRepository extends JpaRepository<Organization, Long> {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/dao/PrivilegeRepository.java

@@ -1,6 +1,6 @@
-package org.baeldung.custom.persistence.dao;
+package com.baeldung.roles.custom.persistence.dao;
 
-import org.baeldung.custom.persistence.model.Privilege;
+import com.baeldung.roles.custom.persistence.model.Privilege;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface PrivilegeRepository extends JpaRepository<Privilege, Long> {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/dao/UserRepository.java

@@ -1,6 +1,6 @@
-package org.baeldung.custom.persistence.dao;
+package com.baeldung.roles.custom.persistence.dao;
 
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.transaction.annotation.Transactional;
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/model/Foo.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.persistence.model;
+package com.baeldung.roles.custom.persistence.model;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/model/Organization.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.persistence.model;
+package com.baeldung.roles.custom.persistence.model;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/model/Privilege.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.persistence.model;
+package com.baeldung.roles.custom.persistence.model;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/persistence/model/User.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.persistence.model;
+package com.baeldung.roles.custom.persistence.model;
 
 import java.util.Set;
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/CustomMethodSecurityExpressionHandler.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
 import org.aopalliance.intercept.MethodInvocation;
 import org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/CustomMethodSecurityExpressionRoot.java

@@ -1,6 +1,6 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.security.access.expression.SecurityExpressionRoot;
 import org.springframework.security.access.expression.method.MethodSecurityExpressionOperations;
 import org.springframework.security.core.Authentication;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/CustomPermissionEvaluator.java

@@ -1,4 +1,4 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
 import java.io.Serializable;
 

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/MySecurityExpressionRoot.java

@@ -1,11 +1,11 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
 import java.io.Serializable;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
 
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.security.access.PermissionEvaluator;
 import org.springframework.security.access.expression.method.MethodSecurityExpressionOperations;
 import org.springframework.security.access.hierarchicalroles.RoleHierarchy;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/MyUserDetailsService.java

@@ -1,7 +1,7 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
-import org.baeldung.custom.persistence.dao.UserRepository;
+import com.baeldung.roles.custom.persistence.dao.UserRepository;
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/security/MyUserPrincipal.java

@@ -1,11 +1,11 @@
-package org.baeldung.custom.security;
+package com.baeldung.roles.custom.security;
 
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-import org.baeldung.custom.persistence.model.Privilege;
+import com.baeldung.roles.custom.persistence.model.Privilege;
-import org.baeldung.custom.persistence.model.User;
+import com.baeldung.roles.custom.persistence.model.User;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/custom/web/MainController.java

@@ -1,9 +1,9 @@
-package org.baeldung.custom.web;
+package com.baeldung.roles.custom.web;
 
-import org.baeldung.custom.persistence.dao.OrganizationRepository;
+import com.baeldung.roles.custom.persistence.dao.OrganizationRepository;
-import org.baeldung.custom.persistence.model.Foo;
+import com.baeldung.roles.custom.persistence.model.Foo;
-import org.baeldung.custom.persistence.model.Organization;
+import com.baeldung.roles.custom.persistence.model.Organization;
-import org.baeldung.custom.security.MyUserPrincipal;
+import com.baeldung.roles.custom.security.MyUserPrincipal;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.access.prepost.PreAuthorize;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/ip/IpApplication.java

@@ -1,4 +1,4 @@
-package org.baeldung.ip;
+package com.baeldung.roles.ip;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -7,7 +7,7 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
-@ComponentScan("org.baeldung.ip")
+@ComponentScan("com.baeldung.ip")
 @PropertySource("classpath:application-defaults.properties")
 public class IpApplication extends SpringBootServletInitializer {
     public static void main(String[] args) {

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/ip/config/CustomIpAuthenticationProvider.java

@@ -1,4 +1,4 @@
-package org.baeldung.ip.config;
+package com.baeldung.roles.ip.config;
 
 import java.util.ArrayList;
 import java.util.HashSet;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/ip/config/SecurityConfig.java

@@ -1,4 +1,4 @@
-package org.baeldung.ip.config;
+package com.baeldung.roles.ip.config;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/ip/config/SecurityXmlConfig.java

@@ -1,4 +1,4 @@
-package org.baeldung.ip.config;
+package com.baeldung.roles.ip.config;
 
 
 //@Configuration

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/ip/web/MainController.java

@@ -1,11 +1,11 @@
-package org.baeldung.ip.web;
+package com.baeldung.roles.ip.web;
 
 import java.util.List;
 
 import javax.servlet.Filter;
 import javax.servlet.http.HttpServletRequest;
 
-import org.baeldung.custom.persistence.model.Foo;
+import com.baeldung.roles.custom.persistence.model.Foo;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.security.web.FilterChainProxy;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/rolesauthorities/CustomAuthenticationProvider.java

@@ -1,7 +1,7 @@
-package org.baeldung.rolesauthorities;
+package com.baeldung.roles.rolesauthorities;
 
-import org.baeldung.rolesauthorities.model.User;
+import com.baeldung.roles.rolesauthorities.model.User;
-import org.baeldung.rolesauthorities.persistence.UserRepository;
+import com.baeldung.roles.rolesauthorities.persistence.UserRepository;
 import org.springframework.security.authentication.BadCredentialsException;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.authentication.dao.DaoAuthenticationProvider;

spring-security-modules/spring-security-mvc-boot-1/src/main/java/com/baeldung/roles/rolesauthorities/MyLogoutSuccessHandler.java

@@ -1,4 +1,4 @@
-package org.baeldung.rolesauthorities;
+package com.baeldung.roles.rolesauthorities;
 
 import java.io.IOException;