Add java 11 and maven container definition

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

containers/java-11-maven/.devcontainer/Dockerfile

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+#-----------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See LICENSE in the project root for license information.
+#-----------------------------------------------------------------------------------------
+
+FROM maven:3-jdk-11
+
+# Install git, process tools
+RUN apt-get update && apt-get -y install git procps
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+

containers/java-11-maven/.devcontainer/devcontainer.json

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+{
+	"name": "Java 11 & Maven",
+	"dockerFile": "Dockerfile",
+	"extensions": [
+		"vscjava.vscode-java-pack",
+		"redhat.vscode-xml"
+	]
+}

containers/java-11-maven/.npmignore

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+README.md
+test-project
+.vscode
+.npmignore

containers/java-11-maven/.vscode/launch.json

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+{
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Launch App",
+            "request": "launch",
+            "cwd": "${workspaceFolder}/test-project",
+            "console": "internalConsole",
+            "stopOnEntry": false,
+            "mainClass": "mymodule/com.mycompany.app.App",
+            "args": "",
+            "projectName": "my-app"
+        }
+    ]
+}

containers/java-11-maven/README.md

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+# Java 11 & Maven
+
+## Summary
+
+*Develop Java applications. Includes the JDK 11, XML tools, along with any dependencies Maven requires.*
+
+| Metadata | Value |  
+|----------|-------|
+| *Contributors* | The VS Code Java Team |
+| *Definition type* | Dockerfile |
+| *Languages, platforms* | Java, Maven |
+
+## Using this definition with an existing folder
+
+Note that only the integrated terminal is supported by the Remote - Containers extension. You may need to modify `launch.json` configurations to include the following value if an external console is used.
+
+```json
+"console": "integratedTerminal"
+```
+
+Beyond that, just follow these steps to use the definition:
+
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
+
+2. To use VS Code's copy of this definition:
+   1. Start VS Code and open your project folder.
+   2. Press <kbd>F1</kbd> select and **Remote-Containers: Create Container Configuration File...** from the command palette.
+   3. Select the Java 11 & Maven definition.
+
+3. To use latest-and-greatest copy of this definition from the repository:
+   1. Clone this repository.
+   2. Copy the contents of `containers/java-11-maven/.devcontainer` to the root of your project folder.
+   3. Start VS Code and open your project folder.
+
+4. After following step 2 or 3, the contents of the `.devcontainer` folder in your project can be adapted to meet your needs.
+
+5. Finally, press <kbd>F1</kbd> and run **Remote-Containers: Reopen Folder in Container** to start using the definition.
+
+## Testing the definition
+
+This definition includes some test code that will help you verify it is working as expected on your system. Follow these steps:
+
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
+2. Clone this repository.
+3. Start VS Code, press <kbd>F1</kbd>, and select **Remote-Containers: Open Folder in Container...**
+4. Select the `containers/java-11-maven` folder.
+5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project.
+6. You should see "Hello Remote World!" in the a Debug Console after the program executes.
+7. From here, you can add breakpoints or edit the contents of the `test-project` folder to do further testing.
+
+## License
+
+Copyright (c) Microsoft Corporation. All rights reserved.
+
+Licensed under the MIT License. See [LICENSE](https://github.com/Microsoft/vscode-dev-containers/blob/master/LICENSE).

containers/java-11-maven/test-project/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="target/generated-sources/annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="target/generated-test-sources/test-annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

containers/java-11-maven/test-project/.gitignore

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+target

containers/java-11-maven/test-project/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>my-app</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

containers/java-11-maven/test-project/.settings/org.eclipse.jdt.apt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.apt.aptEnabled=false

containers/java-11-maven/test-project/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.compliance=11
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.processAnnotations=disabled
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=11

containers/java-11-maven/test-project/.settings/org.eclipse.m2e.core.prefs

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+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

containers/java-11-maven/test-project/pom.xml

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+<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/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.mycompany.app</groupId>
+  <artifactId>my-app</artifactId>
+  <packaging>jar</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <name>my-app</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>3.0.0-M3</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+          <configuration>
+            <source>11</source>
+            <target>11</target>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

containers/java-11-maven/test-project/src/main/java/com/mycompany/app/App.java

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+/*----------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See LICENSE in the project root for license information.
+ *---------------------------------------------------------------------------------------*/
+
+package com.mycompany.app;
+
+import static javax.xml.XMLConstants.XML_NS_PREFIX;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello Remote World!" );
+        System.out.println("The XML namespace prefix is: " + XML_NS_PREFIX);
+    }
+}

containers/java-11-maven/test-project/src/main/java/module-info.java

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+module mymodule {
+    requires java.base;
+    requires java.xml;
+}

containers/java-11-maven/test-project/src/test/java/com/mycompany/app/AppTest.java

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+package com.mycompany.app;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+
+public class AppTest
+{
+    public AppTest() {
+    }
+
+    @Test
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+
+    @Test
+    public void testMore()
+    {
+        assertTrue( true );
+    }
+}