JAVA-49: Moved compiler-plugin-java-9 to maven-modules

maven-modules/compiler-plugin-java-9/README.md

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+### Relevant Articles
+
+- [Maven Compiler Plugin](https://www.baeldung.com/maven-compiler-plugin)

maven-modules/compiler-plugin-java-9/pom.xml

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+<?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>
+    <groupId>com.baeldung</groupId>
+    <artifactId>compiler-plugin-java-9</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${compiler.plugin.version}</version>
+                <configuration>
+                    <source>${source.version}</source>
+                    <target>${target.version}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>9</source.version>
+        <target.version>9</target.version>
+	</properties>
+
+</project>

maven-modules/compiler-plugin-java-9/src/main/java/com/baeldung/maven/java9/MavenCompilerPlugin.java

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+package com.baeldung.maven.java9;
+
+import static javax.xml.XMLConstants.XML_NS_PREFIX;
+
+public class MavenCompilerPlugin {
+    public static void main(String[] args) {
+        System.out.println("The XML namespace prefix is: " + XML_NS_PREFIX);
+    }
+}

maven-modules/compiler-plugin-java-9/src/main/java/module-info.java

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+module com.baeldung.maven.java9 {
+    requires java.xml;
+}