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Merge branch 'master' of https://github.com/eugenp/tutorials

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Loredana 2020-07-27 11:58:03 +03:00
parent 7a2db4f674 94555a4510
commit 7c04995f67
136 changed files with 2037 additions and 213 deletions
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2
algorithms-miscellaneous-6/README.md
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@ -7,4 +7,6 @@
- [Efficiently Merge Sorted Java Sequences](https://www.baeldung.com/java-merge-sorted-sequences)
- [Introduction to Greedy Algorithms with Java](https://www.baeldung.com/java-greedy-algorithms)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- [Implementing a 2048 Solver in Java](https://www.baeldung.com/2048-java-solver)
- [Finding Top K Elements in an Array](https://www.baeldung.com/java-array-top-elements)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-5)

2
apache-shiro/README.md
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@ -6,4 +6,4 @@ This module contains articles about Apache Shiro
- [Introduction to Apache Shiro](https://www.baeldung.com/apache-shiro)
- [Permissions-Based Access Control with Apache Shiro](https://www.baeldung.com/apache-shiro-access-control)
- [Spring Security vs Apache Shiro](https://www.baeldung.com/spring-security-vs-apache-shiro)

1
core-groovy/README.md
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@ -13,4 +13,5 @@ This module contains articles about core Groovy concepts
- [Converting a String to a Date in Groovy](https://www.baeldung.com/groovy-string-to-date)
- [Guide to I/O in Groovy](https://www.baeldung.com/groovy-io)
- [Convert String to Integer in Groovy](https://www.baeldung.com/groovy-convert-string-to-integer)
- [Groovy Variable Scope](https://www.baeldung.com/groovy/variable-scope)
- [[More -->]](/core-groovy-2)

2
core-java-modules/core-java-11/README.md
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@ -8,7 +8,7 @@ This module contains articles about Java 11 core features
- [Java 11 Local Variable Syntax for Lambda Parameters](https://www.baeldung.com/java-var-lambda-params)
- [Java 11 String API Additions](https://www.baeldung.com/java-11-string-api)
- [Java 11 Nest Based Access Control](https://www.baeldung.com/java-nest-based-access-control)
- [Exploring the New HTTP Client in Java 9 and 11](https://www.baeldung.com/java-9-http-client)
- [Exploring the New HTTP Client in Java](https://www.baeldung.com/java-9-http-client)
- [An Introduction to Epsilon GC: A No-Op Experimental Garbage Collector](https://www.baeldung.com/jvm-epsilon-gc-garbage-collector)
- [Guide to jlink](https://www.baeldung.com/jlink)
- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)

1
core-java-modules/core-java-9-new-features/README.md
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@ -13,3 +13,4 @@ This module contains articles about core Java features that have been introduced
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
- [Multi-Release JAR Files with Maven](https://www.baeldung.com/maven-multi-release-jars)
- [The Difference between RxJava API and the Java 9 Flow API](https://www.baeldung.com/rxjava-vs-java-flow-api)

1
core-java-modules/core-java-9/README.md
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@ -9,3 +9,4 @@ This module contains articles about Java 9 core features
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
- [Easy Ways to Write a Java InputStream to an OutputStream](https://www.baeldung.com/java-inputstream-to-outputstream)

2
core-java-modules/core-java-arrays-guides/README.md
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@ -5,4 +5,4 @@ This module contains complete guides about arrays in Java
### Relevant Articles:
- [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide)
- [Guide to the java.util.Arrays Class](https://www.baeldung.com/java-util-arrays)
- [What is [Ljava.lang.Object;?]](https://www.baeldung.com/java-tostring-array)
- [What is \[Ljava.lang.Object;?](https://www.baeldung.com/java-tostring-array)

2
core-java-modules/core-java-collections-3/README.md
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@ -3,6 +3,7 @@
## Core Java Collections Cookbooks and Examples
### Relevant Articles:
- [Time Comparison of Arrays.sort(Object[]) and Arrays.sort(int[])](https://www.baeldung.com/arrays-sortobject-vs-sortint)
- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)
- [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
@ -10,3 +11,4 @@
- [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
- [Fail-Safe Iterator vs Fail-Fast Iterator](https://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)
- [Quick Guide to the Java Stack](https://www.baeldung.com/java-stack)
- [Convert an Array of Primitives to a List](https://www.baeldung.com/java-primitive-array-to-list)

1
core-java-modules/core-java-concurrency-advanced-3/README.md
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@ -15,4 +15,5 @@ This module contains articles about advanced topics about multithreading with co
- [The ABA Problem in Concurrency](https://www.baeldung.com/cs/aba-concurrency)
- [Introduction to Lock-Free Data Structures](https://www.baeldung.com/lock-free-programming)
- [Introduction to Exchanger in Java](https://www.baeldung.com/java-exchanger)
- [Why Not To Start A Thread In The Constructor?](https://www.baeldung.com/java-thread-constructor)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

2
core-java-modules/core-java-concurrency-basic-2/README.md
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@ -3,10 +3,12 @@
This module contains articles about basic Java concurrency
### Relevant Articles:
- [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
- [wait and notify() Methods in Java](https://www.baeldung.com/java-wait-notify)
- [Difference Between Wait and Sleep in Java](https://www.baeldung.com/java-wait-and-sleep)
- [Guide to the Synchronized Keyword in Java](https://www.baeldung.com/java-synchronized)
- [Life Cycle of a Thread in Java](https://www.baeldung.com/java-thread-lifecycle)
- [Guide to AtomicMarkableReference](https://www.baeldung.com/java-atomicmarkablereference)
- [Why are Local Variables Thread-Safe in Java](https://www.baeldung.com/java-local-variables-thread-safe)
- [[<-- Prev]](/core-java-modules/core-java-concurrency-basic)

31
core-java-modules/core-java-console/src/main/java/com/baeldung/consoleout/ConsoleAndOut.java Normal file
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@ -0,0 +1,31 @@
package com.baeldung.consoleout;
import java.io.Console;
public class ConsoleAndOut {
public static void main(String[] args) {
try {
printConsoleObject();
readPasswordFromConsole();
} catch (Exception ex) {
// Eating NullPointerExcpetion which will occur when this
// program will be run from mediums other than console
}
printSysOut();
}
static void printConsoleObject() {
Console console = System.console();
console.writer().print(console);
}
static void readPasswordFromConsole() {
Console console = System.console();
char[] password = console.readPassword("Enter password: ");
console.printf(String.valueOf(password));
}
static void printSysOut() {
System.out.println(System.out);
}
}

27
core-java-modules/core-java-console/src/test/java/com/baeldung/consoleout/ConsoleAndOutUnitTest.java Normal file
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@ -0,0 +1,27 @@
package com.baeldung.consoleout;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Test;
class ConsoleAndOutUnitTest {
@Test
void whenRetreivingConsole_thenPrintConsoleObject() {
assertThrows(NullPointerException.class, () -> {
ConsoleAndOut.printConsoleObject();
});
}
@Test
void whenReadingPassword_thenReadPassword() {
assertThrows(NullPointerException.class, () -> {
ConsoleAndOut.readPasswordFromConsole();
});
}
@Test
void whenRetrievingSysOut_thenPrintSysOutObject() {
ConsoleAndOut.printSysOut();
}
}

2
core-java-modules/core-java-date-operations-2/README.md
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@ -2,6 +2,7 @@
This module contains articles about date operations in Java.
### Relevant Articles:
- [Get the Current Date Prior to Java 8](https://www.baeldung.com/java-get-the-current-date-legacy)
- [Skipping Weekends While Adding Days to LocalDate in Java 8](https://www.baeldung.com/java-localdate-add-days-skip-weekends)
- [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day)
@ -9,4 +10,5 @@ This module contains articles about date operations in Java.
- [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
- [How to determine day of week by passing specific date in Java?](https://www.baeldung.com/java-get-day-of-week)
- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
- [Getting the Week Number From Any Date](https://www.baeldung.com/java-get-week-number)
- [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

2
core-java-modules/core-java-exceptions-2/README.md
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@ -12,3 +12,5 @@ This module contains articles about core java exceptions
- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
- [Java Global Exception Handler](https://www.baeldung.com/java-global-exception-handler)
- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
- [Java IOException “Too many open files”](https://www.baeldung.com/java-too-many-open-files)
- [When Does Java Throw the ExceptionInInitializerError?](https://www.baeldung.com/java-exceptionininitializererror)

2
core-java-modules/core-java-io-3/README.md
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@ -3,5 +3,7 @@
This module contains articles about core Java input and output (IO)
### Relevant Articles:
- [Java – Create a File](https://www.baeldung.com/java-how-to-create-a-file)
- [Check If a Directory Is Empty in Java](https://www.baeldung.com/java-check-empty-directory)
- [[<-- Prev]](/core-java-modules/core-java-io-2)

27
core-java-modules/core-java-io-3/pom.xml
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@ -46,41 +46,14 @@
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.tomakehurst/wiremock -->
<dependency>
<groupId>com.github.tomakehurst</groupId>
<artifactId>wiremock</artifactId>
<version>${wiremock.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>core-java-io-3</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>${maven-javadoc-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<assertj.version>3.6.1</assertj.version>
<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
<wiremock.version>2.26.3</wiremock.version>
</properties>
</project>

63
core-java-modules/core-java-io-3/src/test/java/com/baeldung/emptiness/DirectoryEmptinessUnitTest.java Normal file
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@ -0,0 +1,63 @@
package com.baeldung.emptiness;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;
import static org.assertj.core.api.Assertions.assertThat;
public class DirectoryEmptinessUnitTest {
@Test
public void givenPath_whenInvalid_thenReturnsFalse() throws IOException {
assertThat(isEmpty(Paths.get("invalid-addr"))).isFalse();
}
@Test
public void givenPath_whenNotDirectory_thenReturnsFalse() throws IOException {
Path aFile = Paths.get(getClass().getResource("/notDir.txt").getPath());
assertThat(isEmpty(aFile)).isFalse();
}
@Test
public void givenPath_whenNotEmptyDir_thenReturnsFalse() throws IOException {
Path currentDir = new File("").toPath().toAbsolutePath();
assertThat(isEmpty(currentDir)).isFalse();
}
@Test
public void givenPath_whenIsEmpty_thenReturnsTrue() throws Exception {
Path path = Files.createTempDirectory("baeldung-empty");
assertThat(isEmpty(path)).isTrue();
}
private static boolean isEmpty(Path path) throws IOException {
if (Files.isDirectory(path)) {
try (DirectoryStream<Path> directory = Files.newDirectoryStream(path)) {
return !directory.iterator().hasNext();
}
}
return false;
}
private static boolean isEmpty2(Path path) throws IOException {
if (Files.isDirectory(path)) {
try (Stream<Path> entries = Files.list(path)) {
return !entries.findFirst().isPresent();
}
}
return false;
}
private static boolean isEmptyInefficient(Path path) {
return path.toFile().listFiles().length == 0;
}
}

0
core-java-modules/core-java-io-3/src/test/resources/notDir.txt Normal file
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4
core-java-modules/core-java-jvm-2/README.md
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@ -8,4 +8,6 @@ This module contains articles about working with the Java Virtual Machine (JVM).
- [Measuring Object Sizes in the JVM](https://www.baeldung.com/jvm-measuring-object-sizes)
- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)
- [boolean and boolean[] Memory Layout in the JVM](https://www.baeldung.com/jvm-boolean-memory-layout)
- More articles: [[<-- prev]](/core-java-modules/core-java-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)
- More articles: [[<-- prev]](/core-java-modules/core-java-jvm)

2
core-java-modules/core-java-lang-3/README.md
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@ -2,4 +2,6 @@
This module contains articles about core features in the Java language
- [Class.isInstance vs Class.isAssignableFrom](https://www.baeldung.com/java-isinstance-isassignablefrom)
- [Converting a Java String Into a Boolean](https://www.baeldung.com/java-string-to-boolean)
- [[<-- Prev]](/core-java-modules/core-java-lang-2)

2
core-java-modules/core-java-lang-oop-methods/README.md
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@ -3,7 +3,9 @@
This module contains articles about methods in Java
### Relevant Articles:
- [Methods in Java](https://www.baeldung.com/java-methods)
- [Method Overloading and Overriding in Java](https://www.baeldung.com/java-method-overload-override)
- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
- [Guide to hashCode() in Java](https://www.baeldung.com/java-hashcode)
- [The Covariant Return Type in Java](https://www.baeldung.com/java-covariant-return-type)

1
core-java-modules/core-java-networking-2/README.md
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@ -12,4 +12,5 @@ This module contains articles about networking in Java
- [Authentication with HttpUrlConnection](https://www.baeldung.com/java-http-url-connection)
- [Download a File from an URL in Java](https://www.baeldung.com/java-download-file)
- [Handling java.net.ConnectException](https://www.baeldung.com/java-net-connectexception)
- [Getting MAC addresses in Java](https://www.baeldung.com/java-mac-address)
- [[<-- Prev]](/core-java-modules/core-java-networking)

3
core-java-modules/core-java-reflection-2/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Reading the Value of ‘private’ Fields from a Different Class in Java](https://www.baeldung.com/java-reflection-read-private-field-value)

1
core-java-modules/core-java-reflection/README.MD
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@ -8,5 +8,4 @@
- [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
- [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
- [What Causes java.lang.reflect.InvocationTargetException?](https://www.baeldung.com/java-lang-reflect-invocationtargetexception)
- [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
- [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)

2
core-java-modules/core-java-regex/README.md
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@ -3,6 +3,7 @@
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [An Overview of Regular Expressions Performance in Java](https://www.baeldung.com/java-regex-performance)
- [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
- [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
@ -11,3 +12,4 @@
- [How to Use Regular Expressions to Replace Tokens in Strings](https://www.baeldung.com/java-regex-token-replacement)
- [Regular Expressions \s and \s+ in Java](https://www.baeldung.com/java-regex-s-splus)
- [Validate Phone Numbers With Java Regex](https://www.baeldung.com/java-regex-validate-phone-numbers)
- [How to Count the Number of Matches for a Regex?](https://www.baeldung.com/java-count-regex-matches)

1
core-java-modules/core-java-security-2/README.md
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@ -9,4 +9,5 @@ This module contains articles about core Java Security
- [Hashing a Password in Java](https://www.baeldung.com/java-password-hashing)
- [SHA-256 and SHA3-256 Hashing in Java](https://www.baeldung.com/sha-256-hashing-java)
- [Checksums in Java](https://www.baeldung.com/java-checksums)
- [How to Read PEM File to Get Public and Private Keys](https://www.baeldung.com/java-read-pem-file-keys)
- More articles: [[<-- prev]](/core-java-modules/core-java-security)

3
core-java-modules/core-java-string-operations-3/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Version Comparison in Java](https://www.baeldung.com/java-comparing-versions)

2
core-kotlin-modules/core-kotlin-collections/README.md
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@ -3,6 +3,7 @@
This module contains articles about core Kotlin collections.
### Relevant articles:
- [Split a List Into Parts in Kotlin](https://www.baeldung.com/kotlin-split-list-into-parts)
- [Finding an Element in a List Using Kotlin](https://www.baeldung.com/kotlin-finding-element-in-list)
- [Overview of Kotlin Collections API](https://www.baeldung.com/kotlin-collections-api)
@ -12,3 +13,4 @@ This module contains articles about core Kotlin collections.
- [Difference between fold and reduce in Kotlin](https://www.baeldung.com/kotlin/fold-vs-reduce)
- [Guide to Sorting in Kotlin](https://www.baeldung.com/kotlin-sort)
- [Working With Lists in Kotlin](https://www.baeldung.com/kotlin/lists)
- [Iterating Collections by Index in Kotlin](https://www.baeldung.com/kotlin/iterating-collections-by-index)

33
core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/index/IndexedIteration.kt Normal file
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@ -0,0 +1,33 @@
package com.baeldung.index
fun main() {
// Index only
val colors = listOf("Red", "Green", "Blue")
for (i in colors.indices) {
println(colors[i])
}
val colorArray = arrayOf("Red", "Green", "Blue")
for (i in colorArray.indices) {
println(colorArray[i])
}
(0 until colors.size).forEach { println(colors[it]) }
for (i in 0 until colors.size) {
println(colors[i])
}
// Index and Value
colors.forEachIndexed { i, v -> println("The value for index $i is $v") }
for (indexedValue in colors.withIndex()) {
println("The value for index ${indexedValue.index} is ${indexedValue.value}")
}
for ((i, v) in colors.withIndex()) {
println("The value for index $i is $v")
}
colors.filterIndexed { i, _ -> i % 2 == 0 }
colors.filterIndexed { _, v -> v == "RED" }
}

1
core-kotlin-modules/core-kotlin-lang-oop-2/README.md
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@ -7,4 +7,5 @@ This module contains articles about Object-Oriented Programming in Kotlin
- [Generics in Kotlin](https://www.baeldung.com/kotlin-generics)
- [Delegated Properties in Kotlin](https://www.baeldung.com/kotlin-delegated-properties)
- [Delegation Pattern in Kotlin](https://www.baeldung.com/kotlin-delegation-pattern)
- [Anonymous Inner Classes in Kotlin](https://www.baeldung.com/kotlin/anonymous-inner-classes)
- [[<-- Prev]](/core-kotlin-modules/core-kotlin-lang-oop)

41
core-kotlin-modules/core-kotlin-lang-oop-2/src/main/kotlin/com/baeldung/anonymous/Anonymous.kt Normal file
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@ -0,0 +1,41 @@
package com.baeldung.anonymous
import java.io.Serializable
import java.nio.channels.Channel
fun main() {
val channel = object : Channel {
override fun isOpen() = false
override fun close() {
}
}
val maxEntries = 10
val lruCache = object : LinkedHashMap<String, Int>(10, 0.75f) {
override fun removeEldestEntry(eldest: MutableMap.MutableEntry<String, Int>?): Boolean {
return size > maxEntries
}
}
val map = object : LinkedHashMap<String, Int>() {
// omitted
}
val serializableChannel = object : Channel, Serializable {
override fun isOpen(): Boolean {
TODO("Not yet implemented")
}
override fun close() {
TODO("Not yet implemented")
}
}
val obj = object {
val question = "answer"
val answer = 42
}
println("The ${obj.question} is ${obj.answer}")
}

1
data-structures/README.md
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@ -11,3 +11,4 @@ This module contains articles about data structures in Java
- [Introduction to Big Queue](https://www.baeldung.com/java-big-queue)
- [Guide to AVL Trees in Java](https://www.baeldung.com/java-avl-trees)
- [Graphs in Java](https://www.baeldung.com/java-graphs)
- [Implementing a Ring Buffer in Java](https://www.baeldung.com/java-ring-buffer)

310
docker/docker-spring-boot/mvnw vendored Executable file
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@ -0,0 +1,310 @@
#!/bin/sh
# ----------------------------------------------------------------------------
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# ----------------------------------------------------------------------------
# ----------------------------------------------------------------------------
# Maven Start Up Batch script
#
# Required ENV vars:
# ------------------
# JAVA_HOME - location of a JDK home dir
#
# Optional ENV vars
# -----------------
# M2_HOME - location of maven2's installed home dir
# MAVEN_OPTS - parameters passed to the Java VM when running Maven
# e.g. to debug Maven itself, use
# set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
# MAVEN_SKIP_RC - flag to disable loading of mavenrc files
# ----------------------------------------------------------------------------
if [ -z "$MAVEN_SKIP_RC" ] ; then
if [ -f /etc/mavenrc ] ; then
. /etc/mavenrc
fi
if [ -f "$HOME/.mavenrc" ] ; then
. "$HOME/.mavenrc"
fi
fi
# OS specific support. $var _must_ be set to either true or false.
cygwin=false;
darwin=false;
mingw=false
case "`uname`" in
CYGWIN*) cygwin=true ;;
MINGW*) mingw=true;;
Darwin*) darwin=true
# Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
# See https://developer.apple.com/library/mac/qa/qa1170/_index.html
if [ -z "$JAVA_HOME" ]; then
if [ -x "/usr/libexec/java_home" ]; then
export JAVA_HOME="`/usr/libexec/java_home`"
else
export JAVA_HOME="/Library/Java/Home"
fi
fi
;;
esac
if [ -z "$JAVA_HOME" ] ; then
if [ -r /etc/gentoo-release ] ; then
JAVA_HOME=`java-config --jre-home`
fi
fi
if [ -z "$M2_HOME" ] ; then
## resolve links - $0 may be a link to maven's home
PRG="$0"
# need this for relative symlinks
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG="`dirname "$PRG"`/$link"
fi
done
saveddir=`pwd`
M2_HOME=`dirname "$PRG"`/..
# make it fully qualified
M2_HOME=`cd "$M2_HOME" && pwd`
cd "$saveddir"
# echo Using m2 at $M2_HOME
fi
# For Cygwin, ensure paths are in UNIX format before anything is touched
if $cygwin ; then
[ -n "$M2_HOME" ] &&
M2_HOME=`cygpath --unix "$M2_HOME"`
[ -n "$JAVA_HOME" ] &&
JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
[ -n "$CLASSPATH" ] &&
CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
fi
# For Mingw, ensure paths are in UNIX format before anything is touched
if $mingw ; then
[ -n "$M2_HOME" ] &&
M2_HOME="`(cd "$M2_HOME"; pwd)`"
[ -n "$JAVA_HOME" ] &&
JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
fi
if [ -z "$JAVA_HOME" ]; then
javaExecutable="`which javac`"
if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
# readlink(1) is not available as standard on Solaris 10.
readLink=`which readlink`
if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
if $darwin ; then
javaHome="`dirname \"$javaExecutable\"`"
javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
else
javaExecutable="`readlink -f \"$javaExecutable\"`"
fi
javaHome="`dirname \"$javaExecutable\"`"
javaHome=`expr "$javaHome" : '\(.*\)/bin'`
JAVA_HOME="$javaHome"
export JAVA_HOME
fi
fi
fi
if [ -z "$JAVACMD" ] ; then
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
else
JAVACMD="`which java`"
fi
fi
if [ ! -x "$JAVACMD" ] ; then
echo "Error: JAVA_HOME is not defined correctly." >&2
echo " We cannot execute $JAVACMD" >&2
exit 1
fi
if [ -z "$JAVA_HOME" ] ; then
echo "Warning: JAVA_HOME environment variable is not set."
fi
CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
# traverses directory structure from process work directory to filesystem root
# first directory with .mvn subdirectory is considered project base directory
find_maven_basedir() {
if [ -z "$1" ]
then
echo "Path not specified to find_maven_basedir"
return 1
fi
basedir="$1"
wdir="$1"
while [ "$wdir" != '/' ] ; do
if [ -d "$wdir"/.mvn ] ; then
basedir=$wdir
break
fi
# workaround for JBEAP-8937 (on Solaris 10/Sparc)
if [ -d "${wdir}" ]; then
wdir=`cd "$wdir/.."; pwd`
fi
# end of workaround
done
echo "${basedir}"
}
# concatenates all lines of a file
concat_lines() {
if [ -f "$1" ]; then
echo "$(tr -s '\n' ' ' < "$1")"
fi
}
BASE_DIR=`find_maven_basedir "$(pwd)"`
if [ -z "$BASE_DIR" ]; then
exit 1;
fi
##########################################################################################
# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
# This allows using the maven wrapper in projects that prohibit checking in binary data.
##########################################################################################
if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
if [ "$MVNW_VERBOSE" = true ]; then
echo "Found .mvn/wrapper/maven-wrapper.jar"
fi
else
if [ "$MVNW_VERBOSE" = true ]; then
echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
fi
if [ -n "$MVNW_REPOURL" ]; then
jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
else
jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
fi
while IFS="=" read key value; do
case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
esac
done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
if [ "$MVNW_VERBOSE" = true ]; then
echo "Downloading from: $jarUrl"
fi
wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
if $cygwin; then
wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
fi
if command -v wget > /dev/null; then
if [ "$MVNW_VERBOSE" = true ]; then
echo "Found wget ... using wget"
fi
if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
wget "$jarUrl" -O "$wrapperJarPath"
else
wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
fi
elif command -v curl > /dev/null; then
if [ "$MVNW_VERBOSE" = true ]; then
echo "Found curl ... using curl"
fi
if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
curl -o "$wrapperJarPath" "$jarUrl" -f
else
curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
fi
else
if [ "$MVNW_VERBOSE" = true ]; then
echo "Falling back to using Java to download"
fi
javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
# For Cygwin, switch paths to Windows format before running javac
if $cygwin; then
javaClass=`cygpath --path --windows "$javaClass"`
fi
if [ -e "$javaClass" ]; then
if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
if [ "$MVNW_VERBOSE" = true ]; then
echo " - Compiling MavenWrapperDownloader.java ..."
fi
# Compiling the Java class
("$JAVA_HOME/bin/javac" "$javaClass")
fi
if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
# Running the downloader
if [ "$MVNW_VERBOSE" = true ]; then
echo " - Running MavenWrapperDownloader.java ..."
fi
("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
fi
fi
fi
fi
##########################################################################################
# End of extension
##########################################################################################
export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
if [ "$MVNW_VERBOSE" = true ]; then
echo $MAVEN_PROJECTBASEDIR
fi
MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
# For Cygwin, switch paths to Windows format before running java
if $cygwin; then
[ -n "$M2_HOME" ] &&
M2_HOME=`cygpath --path --windows "$M2_HOME"`
[ -n "$JAVA_HOME" ] &&
JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
[ -n "$CLASSPATH" ] &&
CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
[ -n "$MAVEN_PROJECTBASEDIR" ] &&
MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
fi
# Provide a "standardized" way to retrieve the CLI args that will
# work with both Windows and non-Windows executions.
MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
export MAVEN_CMD_LINE_ARGS
WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
exec "$JAVACMD" \
$MAVEN_OPTS \
-classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
"-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

182
docker/docker-spring-boot/mvnw.cmd vendored Normal file
View File

@ -0,0 +1,182 @@
@REM ----------------------------------------------------------------------------
@REM Licensed to the Apache Software Foundation (ASF) under one
@REM or more contributor license agreements. See the NOTICE file
@REM distributed with this work for additional information
@REM regarding copyright ownership. The ASF licenses this file
@REM to you under the Apache License, Version 2.0 (the
@REM "License"); you may not use this file except in compliance
@REM with the License. You may obtain a copy of the License at
@REM
@REM https://www.apache.org/licenses/LICENSE-2.0
@REM
@REM Unless required by applicable law or agreed to in writing,
@REM software distributed under the License is distributed on an
@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
@REM KIND, either express or implied. See the License for the
@REM specific language governing permissions and limitations
@REM under the License.
@REM ----------------------------------------------------------------------------
@REM ----------------------------------------------------------------------------
@REM Maven Start Up Batch script
@REM
@REM Required ENV vars:
@REM JAVA_HOME - location of a JDK home dir
@REM
@REM Optional ENV vars
@REM M2_HOME - location of maven2's installed home dir
@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
@REM e.g. to debug Maven itself, use
@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
@REM ----------------------------------------------------------------------------
@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
@echo off
@REM set title of command window
title %0
@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO%
@REM set %HOME% to equivalent of $HOME
if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
@REM Execute a user defined script before this one
if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
@REM check for pre script, once with legacy .bat ending and once with .cmd ending
if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
:skipRcPre
@setlocal
set ERROR_CODE=0
@REM To isolate internal variables from possible post scripts, we use another setlocal
@setlocal
@REM ==== START VALIDATION ====
if not "%JAVA_HOME%" == "" goto OkJHome
echo.
echo Error: JAVA_HOME not found in your environment. >&2
echo Please set the JAVA_HOME variable in your environment to match the >&2
echo location of your Java installation. >&2
echo.
goto error
:OkJHome
if exist "%JAVA_HOME%\bin\java.exe" goto init
echo.
echo Error: JAVA_HOME is set to an invalid directory. >&2
echo JAVA_HOME = "%JAVA_HOME%" >&2
echo Please set the JAVA_HOME variable in your environment to match the >&2
echo location of your Java installation. >&2
echo.
goto error
@REM ==== END VALIDATION ====
:init
@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
@REM Fallback to current working directory if not found.
set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
set EXEC_DIR=%CD%
set WDIR=%EXEC_DIR%
:findBaseDir
IF EXIST "%WDIR%"\.mvn goto baseDirFound
cd ..
IF "%WDIR%"=="%CD%" goto baseDirNotFound
set WDIR=%CD%
goto findBaseDir
:baseDirFound
set MAVEN_PROJECTBASEDIR=%WDIR%
cd "%EXEC_DIR%"
goto endDetectBaseDir
:baseDirNotFound
set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
cd "%EXEC_DIR%"
:endDetectBaseDir
IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
@setlocal EnableExtensions EnableDelayedExpansion
for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
:endReadAdditionalConfig
SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
)
@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
if exist %WRAPPER_JAR% (
if "%MVNW_VERBOSE%" == "true" (
echo Found %WRAPPER_JAR%
)
) else (
if not "%MVNW_REPOURL%" == "" (
SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
)
if "%MVNW_VERBOSE%" == "true" (
echo Couldn't find %WRAPPER_JAR%, downloading it ...
echo Downloading from: %DOWNLOAD_URL%
)
powershell -Command "&{"^
"$webclient = new-object System.Net.WebClient;"^
"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
"}"^
"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
"}"
if "%MVNW_VERBOSE%" == "true" (
echo Finished downloading %WRAPPER_JAR%
)
)
@REM End of extension
@REM Provide a "standardized" way to retrieve the CLI args that will
@REM work with both Windows and non-Windows executions.
set MAVEN_CMD_LINE_ARGS=%*
%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
if ERRORLEVEL 1 goto error
goto end
:error
set ERROR_CODE=1
:end
@endlocal & set ERROR_CODE=%ERROR_CODE%
if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
@REM check for post script, once with legacy .bat ending and once with .cmd ending
if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
:skipRcPost
@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
if "%MAVEN_BATCH_PAUSE%" == "on" pause
if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
exit /B %ERROR_CODE%

54
docker/docker-spring-boot/pom.xml Normal file
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@ -0,0 +1,54 @@
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.baeldung.docker</groupId>
<artifactId>spring-boot-docker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-docker</name>
<description>Demo project showing Spring Boot and Docker</description>
<properties>
<java.version>8</java.version>
</properties>
<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>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<layers>
<enabled>true</enabled>
</layers>
</configuration>
</plugin>
</plugins>
</build>
</project>

15
docker/docker-spring-boot/src/main/docker/Dockerfile Normal file
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@ -0,0 +1,15 @@
# To build, run the following command from the top level project directory:
#
# docker build -f src/main/docker/Dockerfile .
FROM adoptopenjdk:11-jre-hotspot as builder
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=layertools -jar application.jar extract
FROM adoptopenjdk:11-jre-hotspot
COPY --from=builder dependencies/ ./
COPY --from=builder snapshot-dependencies/ ./
COPY --from=builder spring-boot-loader/ ./
COPY --from=builder application/ ./
ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

13
docker/docker-spring-boot/src/main/java/com/baeldung/docker/DemoApplication.java Normal file
View File

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

16
docker/docker-spring-boot/src/main/java/com/baeldung/docker/HelloController.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.docker;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@GetMapping("/hello")
public ResponseEntity<String> hello()
{
return ResponseEntity.ok("hello2 ");
}
}

1
docker/docker-spring-boot/src/main/resources/application.properties Normal file
View File

@ -0,0 +1 @@

1
gradle-5/README.md
View File

@ -1,3 +1,4 @@
### Relevant Articles:
- [Run a Java main Method Using Gradle](https://www.baeldung.com/gradle-run-java-main)
- [Finding Unused Gradle Dependencies](https://www.baeldung.com/gradle-finding-unused-dependencies)

2
guava-2/README.md
View File

@ -3,5 +3,5 @@
This module contains articles a Google Guava
### Relevant Articles:
- [Introduction to Guava Throwables](https://www.baeldung.com/guava-throwables)
- [Guava CharMatcher](https://www.baeldung.com/guava-string-charmatcher)

2
guava/README.md
View File

@ -3,6 +3,7 @@
This module contains articles a Google Guava
### Relevant Articles:
- [Guava Functional Cookbook](https://www.baeldung.com/guava-functions-predicates)
- [Guide to Guava’s PreConditions](https://www.baeldung.com/guava-preconditions)
- [Introduction to Guava CacheLoader](https://www.baeldung.com/guava-cacheloader)
@ -13,3 +14,4 @@ This module contains articles a Google Guava
- [Bloom Filter in Java using Guava](https://www.baeldung.com/guava-bloom-filter)
- [Quick Guide to the Guava RateLimiter](https://www.baeldung.com/guava-rate-limiter)
- [Guava Cache](https://www.baeldung.com/guava-cache)
- [Introduction to Guava Throwables](https://www.baeldung.com/guava-throwables)

2
image-processing/README.md
View File

@ -6,3 +6,5 @@ This module contains articles about image processing.
- [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)
- [How Can I Resize an Image Using Java?](https://www.baeldung.com/java-resize-image)
- [Adding Text to an Image in Java](https://www.baeldung.com/java-add-text-to-image)

70
java-collections-conversions-2/src/main/java/com/baeldung/convertlisttomap/ListToMapConverter.java Normal file
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@ -0,0 +1,70 @@
package com.baeldung.convertlisttomap;
import java.util.List;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
/**
* Convert a string list to a map whose key is the string's length and value is the collection with same length.
* Give a list {"Baeldung", "is", "very", "cool"}.
* After conversion we'll get a map like:
* {8 : ["Baeldung"], 2 : ["is"], 4 : ["very", "cool"]}.
*
* @author leasy.zhang
*
*/
public class ListToMapConverter {
public Map<Integer, List<String>> groupingByStringLength(List<String> source,
Supplier<Map<Integer, List<String>>> mapSupplier,
Supplier<List<String>> listSupplier) {
return source.stream()
.collect(Collectors.groupingBy(String::length, mapSupplier, Collectors.toCollection(listSupplier)));
}
public Map<Integer, List<String>> streamCollectByStringLength(List<String> source,
Supplier<Map<Integer, List<String>>> mapSupplier,
Supplier<List<String>> listSupplier) {
BiConsumer<Map<Integer, List<String>>, String> accumulator = (response, element) -> {
Integer key = element.length();
List<String> values = response.getOrDefault(key, listSupplier.get());
values.add(element);
response.put(key, values);
};
BiConsumer<Map<Integer, List<String>>, Map<Integer, List<String>>> combiner = (res1, res2) -> {
res1.putAll(res2);
};
return source.stream()
.collect(mapSupplier, accumulator, combiner);
}
public Map<Integer, List<String>> collectorToMapByStringLength(List<String> source,
Supplier<Map<Integer, List<String>>> mapSupplier,
Supplier<List<String>> listSupplier) {
Function<String, Integer> keyMapper = String::length;
Function<String, List<String>> valueMapper = (element) -> {
List<String> collection = listSupplier.get();
collection.add(element);
return collection;
};
BinaryOperator<List<String>> mergeFunction = (existing, replacement) -> {
existing.addAll(replacement);
return existing;
};
return source.stream()
.collect(Collectors.toMap(keyMapper, valueMapper, mergeFunction, mapSupplier));
}
}

46
java-collections-conversions-2/src/test/java/com/baeldung/convertlisttomap/ListToMapUnitTest.java Normal file
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@ -0,0 +1,46 @@
package com.baeldung.convertlisttomap;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Before;
import org.junit.Test;
public class ListToMapUnitTest {
private ListToMapConverter converter;
private List<String> source;
@Before
public void setUp() {
converter = new ListToMapConverter();
source = Arrays.asList("List", "Map", "Set", "Tree");
}
@Test
public void givenAList_whenConvertWithJava8GroupBy_thenReturnMap() {
Map<Integer, List<String>> convertedMap = converter.groupingByStringLength(source, HashMap::new, ArrayList::new);
assertTrue(convertedMap.get(3)
.contains("Map"));
}
@Test
public void givenAList_whenConvertWithJava8Collect_thenReturnMap() {
Map<Integer, List<String>> convertedMap = converter.streamCollectByStringLength(source, HashMap::new, ArrayList::new);
assertTrue(convertedMap.get(3)
.contains("Map"));
}
@Test
public void givenAList_whenConvertWithCollectorToMap_thenReturnMap() {
Map<Integer, List<String>> convertedMap = converter.collectorToMapByStringLength(source, HashMap::new, ArrayList::new);
assertTrue(convertedMap.get(3)
.contains("Map"));
}
}

3
java-numbers-3/README.md
View File

@ -11,4 +11,7 @@ This module contains articles about numbers in Java.
- [Listing Numbers Within a Range in Java](https://www.baeldung.com/java-listing-numbers-within-a-range)
- [Fibonacci Series in Java](https://www.baeldung.com/java-fibonacci)
- [Guide to the Number Class in Java](https://www.baeldung.com/java-number-class)
- [Print an Integer in Binary Format in Java](https://www.baeldung.com/java-print-integer-binary)
- [Number Formatting in Java](https://www.baeldung.com/java-number-formatting)
- [Division by Zero in Java: Exception, Infinity, or Not a Number](https://www.baeldung.com/java-division-by-zero)
- More articles: [[<-- prev]](/java-numbers-2)

2
jmh/README.md
View File

@ -5,4 +5,4 @@ This module contains articles about the Java Microbenchmark Harness (JMH).
### Relevant articles:
- [Microbenchmarking with Java](https://www.baeldung.com/java-microbenchmark-harness)
- [A Guide to False Sharing and @Contended](https://www.baeldung.com/java-false-sharing-contended)

1
libraries-security/README.md
View File

@ -10,3 +10,4 @@ This module contains articles about security libraries.
- [Introduction to BouncyCastle with Java](https://www.baeldung.com/java-bouncy-castle)
- [Intro to Jasypt](https://www.baeldung.com/jasypt)
- [Digital Signatures in Java](https://www.baeldung.com/java-digital-signature)
- [How to Read PEM File to Get Public and Private Keys](https://www.baeldung.com/java-read-pem-file-keys)

2
linux-bash/text/README.md
View File

@ -1,4 +1,4 @@
### Relevant Articles:
- [Linux Commands – Remove All Text After X](https://www.baeldung.com/linux/tr-manipulate-strings)
- [Linux Commands – Remove All Text After X](https://www.baeldung.com/linux/remove-text-after-x-in-file)
- [Linux Commands for Appending Multiple Lines to a File](https://www.baeldung.com/linux/appending-multiple-lines-to-file2)

1
mapstruct/README.md
View File

@ -8,3 +8,4 @@ This module contains articles about MapStruct.
- [Custom Mapper with MapStruct](https://www.baeldung.com/mapstruct-custom-mapper)
- [Using Multiple Source Objects with MapStruct](https://www.baeldung.com/mapstruct-multiple-source-objects)
- [Ignoring Unmapped Properties with MapStruct](https://www.baeldung.com/mapstruct-ignore-unmapped-properties)
- [Mapping Collections with MapStruct](https://www.baeldung.com/java-mapstruct-mapping-collections)

54
maven-all/version-collision/pom.xml
View File

@ -1,54 +0,0 @@
<?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">
<parent>
<artifactId>maven-all</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>version-collision</artifactId>
<packaging>pom</packaging>
<modules>
<module>project-a</module>
<module>project-b</module>
<module>project-collision</module>
</modules>
<!--comment section below to provoke version collision in project-collision module-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>29.0-jre</version>
</dependency>
</dependencies>
</dependencyManagement>
<!-- uncomment section below to ban the use of transitive dependencies -->
<!-- <build>-->
<!-- <plugins>-->
<!-- <plugin>-->
<!-- <groupId>org.apache.maven.plugins</groupId>-->
<!-- <artifactId>maven-enforcer-plugin</artifactId>-->
<!-- <version>3.0.0-M3</version>-->
<!-- <executions>-->
<!-- <execution>-->
<!-- <id>enforce-banned-dependencies</id>-->
<!-- <goals>-->
<!-- <goal>enforce</goal>-->
<!-- </goals>-->
<!-- <configuration>-->
<!-- <rules>-->
<!-- <banTransitiveDependencies/>-->
<!-- </rules>-->
<!-- </configuration>-->
<!-- </execution>-->
<!-- </executions>-->
<!-- </plugin>-->
<!-- </plugins>-->
<!-- </build>-->
</project>

2
maven-modules/maven-exec-plugin/README.md
View File

@ -3,3 +3,5 @@
This module contains articles about the Maven Exec Plugin.
### Relevant Articles
- [Run a Java Main Method in Maven](https://www.baeldung.com/maven-java-main-method)

3
maven-modules/maven-plugins/maven-enforcer/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles:
- [Maven Enforcer Plugin](https://www.baeldung.com/maven-enforcer-plugin)

2
maven-modules/maven-properties/.gitignore vendored Normal file
View File

@ -0,0 +1,2 @@
/output-resources
/.idea/

8
maven-modules/maven-properties/README.md Normal file
View File

@ -0,0 +1,8 @@
## Apache Maven
This module contains articles about core Apache Maven. Articles about other Maven plugins (such as the Maven WAR Plugin)
have their own dedicated modules.
### Relevant Articles
- [Accessing Maven Properties in Java](https://www.baeldung.com/java-accessing-maven-properties)

51
maven-modules/maven-properties/pom.xml Normal file
View File

@ -0,0 +1,51 @@
<?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>maven-properties</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>maven-properties</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../..</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>properties-maven-plugin</artifactId>
<version>1.0.0</version>
<executions>
<execution>
<phase>generate-resources</phase>
<goals>
<goal>write-project-properties</goal>
</goals>
<configuration>
<outputFile>${project.build.outputDirectory}/properties-from-pom.properties</outputFile>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<properties>
<name>${project.name}</name>
<my.awesome.property>property-from-pom</my.awesome.property>
</properties>
</project>

41
maven-modules/maven-properties/src/main/java/com/baeldung/maven/properties/PropertiesReader.java Normal file
View File

@ -0,0 +1,41 @@
package com.baeldung.maven.properties;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
* Reads properties from one file.
*
* @author Donato Rimenti
*/
public class PropertiesReader {
/**
* Properties managed by this reader.
*/
private Properties properties;
/**
* Reads the property file with the given name.
*
* @param propertyFileName the name of the property file to read
* @throws IOException if the file is not found or there's a problem reading it
*/
public PropertiesReader(String propertyFileName) throws IOException {
InputStream is = getClass().getClassLoader()
.getResourceAsStream(propertyFileName);
this.properties = new Properties();
this.properties.load(is);
}
/**
* Gets the property with the given name from the property file.
* @param propertyName the name of the property to read
* @return the property with the given name
*/
public String getProperty(String propertyName) {
return this.properties.getProperty(propertyName);
}
}

27
maven-modules/maven-properties/src/test/java/com/baeldung/maven/properties/PropertiesReaderUnitTest.java Normal file
View File

@ -0,0 +1,27 @@
package com.baeldung.maven.properties;
import java.io.IOException;
import org.junit.Assert;
import org.junit.Test;
/**
* Test for {@link PropertiesReader}.
*
* @author Donato Rimenti
*/
public class PropertiesReaderUnitTest {
/**
* Reads a property and checks that's the one expected.
*
* @throws IOException if anything goes wrong
*/
@Test
public void givenPomProperties_whenPropertyRead_thenPropertyReturned() throws IOException {
PropertiesReader reader = new PropertiesReader("properties-from-pom.properties");
String property = reader.getProperty("my.awesome.property");
Assert.assertEquals("property-from-pom", property);
}
}

1
maven-modules/pom.xml
View File

@ -23,6 +23,7 @@
<module>maven-unused-dependencies</module>
<module>maven-war-plugin</module>
<module>maven-profiles</module>
<module>maven-properties</module>
<module>versions-maven-plugin</module>
<module>version-collision</module>
</modules>

3
maven-modules/version-collision/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles:
- [How to Resolve a Version Collision of Artifacts in Maven](https://www.baeldung.com/maven-version-collision)

21
maven-modules/version-collision/child-module/pom.xml
View File

@ -1,21 +0,0 @@
<?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">
<parent>
<artifactId>version-collision</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>child-module</artifactId>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<version>3.3.9</version>
</dependency>
</dependencies>
</project>

64
maven-modules/version-collision/pom.xml
View File

@ -3,7 +3,7 @@
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">
<parent>
<artifactId>maven-all</artifactId>
<artifactId>maven-modules</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
@ -11,34 +11,44 @@
<artifactId>version-collision</artifactId>
<packaging>pom</packaging>
<modules>
<module>child-module</module>
<module>project-a</module>
<module>project-b</module>
<module>project-collision</module>
</modules>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-configuration2</artifactId>
<version>2.7</version>
<!--uncomment section below to exclude commons-lang3 artifact to prevent version collision-->
<!-- <exclusions>-->
<!-- <exclusion>-->
<!-- <groupId>org.apache.commons</groupId>-->
<!-- <artifactId>commons-lang3</artifactId>-->
<!-- </exclusion>-->
<!-- </exclusions>-->
</dependency>
</dependencies>
<!--comment section below to provoke version collision in project-collision module-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>29.0-jre</version>
</dependency>
</dependencies>
</dependencyManagement>
<!--uncomment section below to use dependencyManagement to prevent version collision-->
<!-- <dependencyManagement>-->
<!-- <dependencies>-->
<!-- <dependency>-->
<!-- <groupId>org.apache.commons</groupId>-->
<!-- <artifactId>commons-lang3</artifactId>-->
<!-- <version>3.4</version>-->
<!-- </dependency>-->
<!-- </dependencies>-->
<!-- </dependencyManagement>-->
<!-- uncomment section below to ban the use of transitive dependencies -->
<!-- <build>-->
<!-- <plugins>-->
<!-- <plugin>-->
<!-- <groupId>org.apache.maven.plugins</groupId>-->
<!-- <artifactId>maven-enforcer-plugin</artifactId>-->
<!-- <version>3.0.0-M3</version>-->
<!-- <executions>-->
<!-- <execution>-->
<!-- <id>enforce-banned-dependencies</id>-->
<!-- <goals>-->
<!-- <goal>enforce</goal>-->
<!-- </goals>-->
<!-- <configuration>-->
<!-- <rules>-->
<!-- <banTransitiveDependencies/>-->
<!-- </rules>-->
<!-- </configuration>-->
<!-- </execution>-->
<!-- </executions>-->
<!-- </plugin>-->
<!-- </plugins>-->
<!-- </build>-->
</project>

0
maven-all/version-collision/project-a/pom.xml → maven-modules/version-collision/project-a/pom.xml
View File

0
maven-all/version-collision/project-b/pom.xml → maven-modules/version-collision/project-b/pom.xml
View File

0
maven-all/version-collision/project-collision/pom.xml → maven-modules/version-collision/project-collision/pom.xml
View File

0
maven-all/version-collision/project-collision/src/test/java/com/baeldung/version/collision/VersionCollisionUnitTest.java → maven-modules/version-collision/project-collision/src/test/java/com/baeldung/version/collision/VersionCollisionUnitTest.java
View File

1
patterns/solid/README.md
View File

@ -3,3 +3,4 @@
- [A Solid Guide to Solid Principles](https://www.baeldung.com/solid-principles)
- [Single Responsibility Principle in Java](https://www.baeldung.com/java-single-responsibility-principle)
- [Open/Closed Principle in Java](https://www.baeldung.com/java-open-closed-principle)
- [Interface Segregation Principle in Java](https://www.baeldung.com/java-interface-segregation)

17
patterns/solid/src/main/java/com/baeldung/l/advanced/Account.java Normal file
View File

@ -0,0 +1,17 @@
package com.baeldung.l.advanced;
import java.math.BigDecimal;
public abstract class Account {
protected abstract void deposit(BigDecimal amount);
/**
* Reduces the account balance by the specified amount
* provided given amount > 0 and account meets minimum available
* balance criteria.
*
* @param amount
*/
protected abstract void withdraw(BigDecimal amount);
}

15
patterns/solid/src/main/java/com/baeldung/l/advanced/BankingAppWithdrawalService.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.l.advanced;
import java.math.BigDecimal;
public class BankingAppWithdrawalService {
private Account account;
public BankingAppWithdrawalService(Account account) {
this.account = account;
}
public void withdraw(BigDecimal amount) {
account.withdraw(amount);
}
}

27
patterns/solid/src/main/java/com/baeldung/l/advanced/Bar.java Normal file
View File

@ -0,0 +1,27 @@
package com.baeldung.l.advanced;
public class Bar extends Foo {
@Override
// precondition: 0 < num <= 10
public void doStuff(int num) {
if (num <= 0 || num > 10) {
throw new IllegalArgumentException("Input out of range 1-10");
}
// some logic here...
}
@Override
// precondition: 0 < num <= 3
public void doOtherStuff(int num) {
if (num <= 0 || num > 3) {
throw new IllegalArgumentException("Input out of range 1-3");
}
// some logic here...
}
@Override
public Integer generateNumber() {
return new Integer(10);
}
}

26
patterns/solid/src/main/java/com/baeldung/l/advanced/Car.java Normal file
View File

@ -0,0 +1,26 @@
package com.baeldung.l.advanced;
public abstract class Car {
protected int limit;
// invariant: speed < limit;
protected int speed;
// Allowed to be set once at the time of creation.
// Value can only increment thereafter.
// Value cannot be reset.
protected int mileage;
public Car(int mileage) {
this.mileage = mileage;
}
protected abstract void turnOnEngine();
// postcondition: speed < limit
protected abstract void accelerate();
// postcondition: speed must reduce
protected abstract void brake();
}

15
patterns/solid/src/main/java/com/baeldung/l/advanced/CurrentAccount.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.l.advanced;
import java.math.BigDecimal;
public class CurrentAccount extends Account {
@Override
protected void deposit(BigDecimal amount) {
// Deposit into CurrentAccount
}
@Override
protected void withdraw(BigDecimal amount) {
// Withdraw from CurrentAccount
}
}

23
patterns/solid/src/main/java/com/baeldung/l/advanced/ElectricCar.java Normal file
View File

@ -0,0 +1,23 @@
package com.baeldung.l.advanced;
public class ElectricCar extends Car {
public ElectricCar(int mileage) {
super(mileage);
}
@Override
protected void turnOnEngine() {
throw new AssertionError("I am an Electric Car. I don't have an engine!");
}
@Override
protected void accelerate() {
// this acceleration is crazy!
}
@Override
protected void brake() {
// Apply ElectricCar brake
}
}

18
patterns/solid/src/main/java/com/baeldung/l/advanced/FilePurgingJob.java Normal file
View File

@ -0,0 +1,18 @@
package com.baeldung.l.advanced;
import java.io.IOException;
public class FilePurgingJob {
private FileSystem fileSystem;
public FilePurgingJob(FileSystem fileSystem) {
this.fileSystem = fileSystem;
}
public void purgeOldestFile(String path) throws IOException {
if (!(fileSystem instanceof ReadOnlyFileSystem)) {
// code to detect oldest file
fileSystem.deleteFile(path);
}
}
}

10
patterns/solid/src/main/java/com/baeldung/l/advanced/FileSystem.java Normal file
View File

@ -0,0 +1,10 @@
package com.baeldung.l.advanced;
import java.io.File;
import java.io.IOException;
public interface FileSystem {
File[] listFiles(String path);
void deleteFile(String path) throws IOException;
}

15
patterns/solid/src/main/java/com/baeldung/l/advanced/FixedTermDepositAccount.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.l.advanced;
import java.math.BigDecimal;
public class FixedTermDepositAccount extends Account {
@Override
protected void deposit(BigDecimal amount) {
// Deposit into this account
}
@Override
protected void withdraw(BigDecimal amount) {
throw new UnsupportedOperationException("Withdrawals are not supported by FixedTermDepositAccount!!");
}
}

22
patterns/solid/src/main/java/com/baeldung/l/advanced/Foo.java Normal file
View File

@ -0,0 +1,22 @@
package com.baeldung.l.advanced;
public abstract class Foo {
// precondition: 0 < num <=5
public void doStuff(int num) {
if (num <= 0 || num > 5) {
throw new IllegalArgumentException("Input out of range 1-5");
}
// some logic here...
}
// precondition: 0 < num <=5
public void doOtherStuff(int num) {
if (num <= 0 || num > 5) {
throw new IllegalArgumentException("Input out of range 1-5");
}
// some logic here...
}
public abstract Number generateNumber();
}

28
patterns/solid/src/main/java/com/baeldung/l/advanced/HybridCar.java Normal file
View File

@ -0,0 +1,28 @@
package com.baeldung.l.advanced;
public class HybridCar extends Car {
// invariant: charge >= 0;
private int charge;
public HybridCar(int mileage) {
super(mileage);
}
@Override
protected void turnOnEngine() {
// Start HybridCar
}
@Override
// postcondition: speed < limit
protected void accelerate() {
// Accelerate HybridCar speed < limit
}
@Override
// postcondition: speed must reduce
// postcondition: charge must increase
protected void brake() {
// Apply HybridCar brake
}
}

25
patterns/solid/src/main/java/com/baeldung/l/advanced/MotorCar.java Normal file
View File

@ -0,0 +1,25 @@
package com.baeldung.l.advanced;
public class MotorCar extends Car {
public MotorCar(int mileage) {
super(mileage);
}
@Override
protected void turnOnEngine() {
// Start MotorCar
}
@Override
// postcondition: speed < limit
protected void accelerate() {
// Accelerate MotorCar
}
@Override
// postcondition: speed must reduce
protected void brake() {
// Apply MotorCar brake
}
}

16
patterns/solid/src/main/java/com/baeldung/l/advanced/ReadOnlyFileSystem.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.l.advanced;
import java.io.File;
import java.io.IOException;
public class ReadOnlyFileSystem implements FileSystem {
public File[] listFiles(String path) {
// code to list files
return new File[0];
}
public void deleteFile(String path) throws IOException {
// Do nothing.
// deleteFile operation is not supported on a read-only file system
}
}

15
patterns/solid/src/main/java/com/baeldung/l/advanced/SavingsAccount.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.l.advanced;
import java.math.BigDecimal;
public class SavingsAccount extends Account {
@Override
protected void deposit(BigDecimal amount) {
// Deposit into SavingsAccount
}
@Override
protected void withdraw(BigDecimal amount) {
// Withdraw from SavingsAccount
}
}

24
patterns/solid/src/main/java/com/baeldung/l/advanced/ToyCar.java Normal file
View File

@ -0,0 +1,24 @@
package com.baeldung.l.advanced;
public class ToyCar extends Car {
public ToyCar(int mileage) {
super(mileage);
}
protected void turnOnEngine() {
}
protected void accelerate() {
}
protected void brake() {
}
public void reset() {
mileage = 0;
}
}

7
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/Account.java Normal file
View File

@ -0,0 +1,7 @@
package com.baeldung.l.advanced.refactored;
import java.math.BigDecimal;
public abstract class Account {
protected abstract void deposit(BigDecimal amount);
}

17
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/BankingAppWithdrawalService.java Normal file
View File

@ -0,0 +1,17 @@
package com.baeldung.l.advanced.refactored;
import com.baeldung.l.advanced.Account;
import java.math.BigDecimal;
public class BankingAppWithdrawalService {
private WithdrawableAccount withdrawableAccount;
public BankingAppWithdrawalService(WithdrawableAccount withdrawableAccount) {
this.withdrawableAccount = withdrawableAccount;
}
public void withdraw(BigDecimal amount) {
withdrawableAccount.withdraw(amount);
}
}

13
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/CurrentAccount.java Normal file
View File

@ -0,0 +1,13 @@
package com.baeldung.l.advanced.refactored;
import java.math.BigDecimal;
public class CurrentAccount extends WithdrawableAccount {
protected void deposit(BigDecimal amount) {
// Deposit into CurrentAccount
}
protected void withdraw(BigDecimal amount) {
// Withdraw from CurrentAccount
}
}

9
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/FixedTermDepositAccount.java Normal file
View File

@ -0,0 +1,9 @@
package com.baeldung.l.advanced.refactored;
import java.math.BigDecimal;
public class FixedTermDepositAccount extends Account {
protected void deposit(BigDecimal amount) {
// Deposit into this account
}
}

13
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/SavingsAccount.java Normal file
View File

@ -0,0 +1,13 @@
package com.baeldung.l.advanced.refactored;
import java.math.BigDecimal;
public class SavingsAccount extends WithdrawableAccount {
protected void deposit(BigDecimal amount) {
// Deposit into SavingsAccount
}
protected void withdraw(BigDecimal amount) {
// Withdraw from SavingsAccount
}
}

14
patterns/solid/src/main/java/com/baeldung/l/advanced/refactored/WithdrawableAccount.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.l.advanced.refactored;
import java.math.BigDecimal;
public abstract class WithdrawableAccount extends Account {
/**
* Reduces the account balance by the specified amount
* provided given amount > 0 and account meets minimum available
* balance criteria.
*
* @param amount
*/
protected abstract void withdraw(BigDecimal amount);
}

13
performance-tests/pom.xml
View File

@ -120,6 +120,18 @@
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven-jar-plugin.version}</version>
<configuration>
<archive>
<manifest>
<mainClass>com.baeldung.performancetests.MappingFrameworksPerformance</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
<pluginManagement>
<plugins>
@ -178,6 +190,7 @@
<jmh-core.version>1.21</jmh-core.version>
<jmh-generator.version>1.21</jmh-generator.version>
<maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
<maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
<!--
Java source/target to use for compilation.

69
performance-tests/src/main/java/com/baeldung/performancetests/exception/ExceptionBenchmark.java Normal file
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@ -0,0 +1,69 @@
package com.baeldung.performancetests.exception;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.Blackhole;
import java.util.concurrent.TimeUnit;
@Fork(1)
@Warmup(iterations = 2)
@Measurement(iterations = 10)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class ExceptionBenchmark {
private static final int LIMIT = 10_000;
@Benchmark
public void doNotThrowException(Blackhole blackhole) {
for (int i = 0; i < LIMIT; i++) {
blackhole.consume(new Object());
}
}
@Benchmark
public void throwAndCatchException(Blackhole blackhole) {
for (int i = 0; i < LIMIT; i++) {
try {
throw new Exception();
} catch (Exception e) {
blackhole.consume(e);
}
}
}
@Benchmark
public void createExceptionWithoutThrowingIt(Blackhole blackhole) {
for (int i = 0; i < LIMIT; i++) {
blackhole.consume(new Exception());
}
}
@Benchmark
@Fork(value = 1, jvmArgs = "-XX:-StackTraceInThrowable")
public void throwExceptionWithoutAddingStackTrace(Blackhole blackhole) {
for (int i = 0; i < LIMIT; i++) {
try {
throw new Exception();
} catch (Exception e) {
blackhole.consume(e);
}
}
}
@Benchmark
public void throwExceptionAndUnwindStackTrace(Blackhole blackhole) {
for (int i = 0; i < LIMIT; i++) {
try {
throw new Exception();
} catch (Exception e) {
blackhole.consume(e.getStackTrace());
}
}
}
}

3
persistence-modules/apache-bookkeeper/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Guide to Apache BookKeeper](https://www.baeldung.com/java-apache-bookkeeper)

3
persistence-modules/core-java-persistence/README.md
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@ -3,6 +3,7 @@
## Core Java Persistence Examples
### Relevant Articles:
- [Introduction to JDBC](http://www.baeldung.com/java-jdbc)
- [Batch Processing in JDBC](http://www.baeldung.com/jdbc-batch-processing)
- [Introduction to the JDBC RowSet Interface in Java](http://www.baeldung.com/java-jdbc-rowset)
@ -10,3 +11,5 @@
- [Guide to the JDBC ResultSet Interface](https://www.baeldung.com/jdbc-resultset)
- [Types of SQL Joins](https://www.baeldung.com/sql-joins)
- [Returning the Generated Keys in JDBC](https://www.baeldung.com/jdbc-returning-generated-keys)
- [Loading JDBC Drivers](https://www.baeldung.com/java-jdbc-loading-drivers)
- [Difference Between Statement and PreparedStatement](https://www.baeldung.com/java-statement-preparedstatement)

1
persistence-modules/flyway-repair/README.MD Normal file
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@ -0,0 +1 @@
### Relevant Articles:

1
persistence-modules/flyway-repair/docker-compose/.env Normal file
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@ -0,0 +1 @@
POSTGRES_PORT=5431

15
persistence-modules/flyway-repair/docker-compose/docker-compose.yaml Normal file
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@ -0,0 +1,15 @@
version: '3.0'
services:
postgres-test:
image: postgres:11.5
ports:
- ${POSTGRES_PORT}:5432
env_file: postgres.env
networks:
- baeldung
networks:
baeldung:
driver: bridge

3
persistence-modules/flyway-repair/docker-compose/postgres.env Normal file
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@ -0,0 +1,3 @@
POSTGRES_USER=testuser
POSTGRES_PASSWORD=password
POSTGRES_DB=testdb

80
persistence-modules/flyway-repair/pom.xml Normal file
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@ -0,0 +1,80 @@
<?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>flyway</artifactId>
<name>flyway-repair</name>
<packaging>jar</packaging>
<description>Flyway Repair Demo</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>h2</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<spring-boot.run.profiles>h2</spring-boot.run.profiles>
</properties>
<dependencies>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
</profile>
<profile>
<id>postgres</id>
<properties>
<spring-boot.run.profiles>postgres</spring-boot.run.profiles>
</properties>
<dependencies>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
</profile>
</profiles>
<properties>
<flyway.configFiles>src/main/resources/application-${spring-boot.run.profiles}.properties</flyway.configFiles>
</properties>
</project>

13
persistence-modules/flyway-repair/src/main/java/com/baeldung/flywaycallbacks/FlywayApplication.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.flywaycallbacks;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class FlywayApplication {
public static void main(String[] args) {
SpringApplication.run(FlywayApplication.class, args);
}
}

1
persistence-modules/flyway-repair/src/main/resources/application-callbacks.properties Normal file
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@ -0,0 +1 @@
spring.flyway.locations=classpath:db/migration,classpath:db/callback

3
persistence-modules/flyway-repair/src/main/resources/application-h2.properties Normal file
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@ -0,0 +1,3 @@
flyway.url=jdbc:h2:file:./testdb;DB_CLOSE_ON_EXIT=FALSE;AUTO_RECONNECT=TRUE;MODE=MySQL;DATABASE_TO_UPPER=false;
flyway.user=testuser
flyway.password=password

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