BAEL-4588: Update Guide To Java 8 Optional (#9995)

* BAEL-4588: Fix maven-shade-plugin version

* BAEL-4588: Add empty core-java-11-2 module structure

* BAEL-4588: Move Guide To Java 8 Optional to core-java-11-2

* BAEL-4588: Add Java 10 orElseThrow() example

core-java-modules/core-java-11-2/README.md

@@ -0,0 +1,7 @@
+## Core Java 11
+
+This module contains articles about Java 11 core features
+
+### Relevant articles
+- [Guide to Java 8 Optional](https://www.baeldung.com/java-optional)
+

core-java-modules/core-java-11-2/pom.xml

@@ -0,0 +1,48 @@
+<?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>core-java-11-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-11-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source.version>11</maven.compiler.source.version>
+        <maven.compiler.target.version>11</maven.compiler.target.version>
+        <assertj.version>3.17.2</assertj.version>
+    </properties>
+
+</project>

core-java-modules/core-java-11-2/src/test/java/com/baeldung/optional/OptionalChainingUnitTest.java

@@ -7,7 +7,9 @@ import java.util.Optional;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
 public class OptionalChainingUnitTest {
 

core-java-modules/core-java-11-2/src/test/java/com/baeldung/optional/OptionalUnitTest.java

@@ -9,7 +9,9 @@ import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.Optional;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
 public class OptionalUnitTest {
 
@@ -262,6 +264,12 @@ public class OptionalUnitTest {
             .orElseThrow(IllegalArgumentException::new);
     }
 
+    @Test(expected = NoSuchElementException.class)
+    public void whenNoArgOrElseThrowWorks_thenCorrect() {
+        String nullName = null;
+        String name = Optional.ofNullable(nullName).orElseThrow();
+    }
+
     public String getMyDefault() {
         LOG.debug("Getting default value...");
         return "Default Value";

core-java-modules/core-java-11/pom.xml

@@ -107,7 +107,7 @@
         <uberjar.name>benchmarks</uberjar.name>
         <jmh.version>1.22</jmh.version>
         <eclipse.collections.version>10.0.0</eclipse.collections.version>
-        <shade.plugin.version>10.0.0</shade.plugin.version>
+        <shade.plugin.version>3.2.4</shade.plugin.version>
     </properties>
 
 </project>

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

@@ -4,7 +4,6 @@ This module contains articles about Java Optional.
 
 ### Relevant Articles: 
 - [Java Optional as Return Type](https://www.baeldung.com/java-optional-return)
-- [Guide to Java 8 Optional](https://www.baeldung.com/java-optional)
 - [Java Optional – orElse() vs orElseGet()](https://www.baeldung.com/java-optional-or-else-vs-or-else-get)
 - [Transforming an Empty String into an Empty Optional](https://www.baeldung.com/java-empty-string-to-empty-optional)
 - [Filtering a Stream of Optionals in Java](https://www.baeldung.com/java-filter-stream-of-optional)