compiles empty plugin with mvn clean package

plugins/click.kamil.ui/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src/main/java"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

plugins/click.kamil.ui/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>click.kamil.ui</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

plugins/click.kamil.ui/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

plugins/click.kamil.ui/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: Java Ui
+Bundle-SymbolicName: click.kamil.ui;singleton:=true
+Bundle-Version: 1.0.0.qualifier
+Bundle-Activator: click.kamil.ui.UiPlugin
+Require-Bundle: org.eclipse.ui,
+ org.eclipse.core.runtime
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Automatic-Module-Name: click.kamil.ui
+Bundle-ActivationPolicy: lazy

plugins/click.kamil.ui/build.properties

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+source.. = src/main/java/
+output.. = target/classes/
+bin.includes = plugin.xml,\
+               META-INF/,\
+               .,\
+               icons/

plugins/click.kamil.ui/plugin.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<?eclipse version="3.4"?>
+<plugin>
+
+   <extension
+         point="org.eclipse.ui.commands">
+      <category
+            id="click.kamil.ui.commands.category"
+            name="Sample Category">
+      </category>
+      <command
+            categoryId="click.kamil.ui.commands.category"
+            name="Sample Command"
+            id="click.kamil.ui.commands.sampleCommand">
+      </command>
+   </extension>
+   <extension
+         point="org.eclipse.ui.handlers">
+      <handler
+            class="click.kamil.ui.handlers.SampleHandler"
+            commandId="click.kamil.ui.commands.sampleCommand">
+      </handler>
+   </extension>
+   <extension
+         point="org.eclipse.ui.bindings">
+      <key
+            commandId="click.kamil.ui.commands.sampleCommand"
+            schemeId="org.eclipse.ui.defaultAcceleratorConfiguration"
+            contextId="org.eclipse.ui.contexts.window"
+            sequence="M1+6">
+      </key>
+   </extension>
+   <extension
+         point="org.eclipse.ui.menus">
+      <menuContribution
+            locationURI="menu:org.eclipse.ui.main.menu?after=additions">
+         <menu
+               id="click.kamil.ui.menus.sampleMenu"
+               label="Sample Menu"
+               mnemonic="M">
+            <command
+                  commandId="click.kamil.ui.commands.sampleCommand"
+                  id="click.kamil.ui.menus.sampleCommand"
+                  mnemonic="S">
+            </command>
+         </menu>
+      </menuContribution>
+      <menuContribution
+            locationURI="toolbar:org.eclipse.ui.main.toolbar?after=additions">
+         <toolbar
+               id="click.kamil.ui.toolbars.sampleToolbar">
+            <command
+                  id="click.kamil.ui.toolbars.sampleCommand"
+                  commandId="click.kamil.ui.commands.sampleCommand"
+                  icon="icons/sample.png"
+                  tooltip="Say hello world">
+            </command>
+         </toolbar>
+      </menuContribution>
+   </extension>
+
+</plugin>

plugins/click.kamil.ui/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>click.kamil.ui</artifactId>
+	<packaging>eclipse-plugin</packaging>
+	
+	<name>My UI Plugin</name>
+	
+	<parent>
+		<groupId>click.kamil</groupId>
+		<artifactId>click.kamil.eclipse-plugin.parent</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+		<relativePath>../../releng/pom.xml</relativePath>
+	</parent>
+	<dependencies>
+	</dependencies>
+</project>

plugins/click.kamil.ui/src/main/java/click/kamil/ui/UiPlugin.java

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+package click.kamil.ui;
+
+import org.eclipse.jface.resource.ImageDescriptor;
+import org.eclipse.ui.plugin.AbstractUIPlugin;
+import org.osgi.framework.BundleContext;
+
+/**
+ * The activator class controls the plug-in life cycle
+ */
+public class UiPlugin extends AbstractUIPlugin {
+
+	// The plug-in ID
+	public static final String PLUGIN_ID = "click.kamil.ui"; //$NON-NLS-1$
+
+	// The shared instance
+	private static UiPlugin plugin;
+	
+	/**
+	 * The constructor
+	 */
+	public UiPlugin() {
+	}
+
+	@Override
+	public void start(BundleContext context) throws Exception {
+		super.start(context);
+		plugin = this;
+	}
+
+	@Override
+	public void stop(BundleContext context) throws Exception {
+		plugin = null;
+		super.stop(context);
+	}
+
+	/**
+	 * Returns the shared instance
+	 *
+	 * @return the shared instance
+	 */
+	public static UiPlugin getDefault() {
+		return plugin;
+	}
+
+	/**
+	 * Returns an image descriptor for the image file at the given
+	 * plug-in relative path
+	 *
+	 * @param path the path
+	 * @return the image descriptor
+	 */
+	public static ImageDescriptor getImageDescriptor(String path) {
+		return imageDescriptorFromPlugin(PLUGIN_ID, path);
+	}
+}

plugins/click.kamil.ui/src/main/java/click/kamil/ui/handlers/SampleHandler.java

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+package click.kamil.ui.handlers;
+
+import org.eclipse.core.commands.AbstractHandler;
+import org.eclipse.core.commands.ExecutionEvent;
+import org.eclipse.core.commands.ExecutionException;
+import org.eclipse.ui.IWorkbenchWindow;
+import org.eclipse.ui.handlers.HandlerUtil;
+import org.eclipse.jface.dialogs.MessageDialog;
+
+public class SampleHandler extends AbstractHandler {
+
+	@Override
+	public Object execute(ExecutionEvent event) throws ExecutionException {
+//		IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
+//		MessageDialog.openInformation(
+//				window.getShell(),
+//				"Java Ui",
+//				"Hello, Eclipse world");
+		return null;
+	}
+}