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diff --git a/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/JcrExplorerPlugin.java b/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/JcrExplorerPlugin.java
new file mode 100644
index 000000000..c8aaab115
--- /dev/null
+++ b/server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/JcrExplorerPlugin.java
@@ -0,0 +1,92 @@
+package org.argeo.jcr.ui.explorer;
+
+import java.util.ResourceBundle;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+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 JcrExplorerPlugin extends AbstractUIPlugin {
+	private final static Log log = LogFactory.getLog(JcrExplorerPlugin.class);
+	private ResourceBundle messages;
+
+	// The plug-in ID
+	public static final String ID = "org.argeo.jcr.ui.explorer"; //$NON-NLS-1$
+
+	// The shared instance
+	private static JcrExplorerPlugin plugin;
+
+	/**
+	 * The constructor
+	 */
+	public JcrExplorerPlugin() {
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext
+	 * )
+	 */
+	public void start(BundleContext context) throws Exception {
+		super.start(context);
+		plugin = this;
+		messages = ResourceBundle
+				.getBundle("org.argeo.jcr.ui.explorer.messages");
+
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext
+	 * )
+	 */
+	public void stop(BundleContext context) throws Exception {
+		plugin = null;
+		super.stop(context);
+	}
+
+	/**
+	 * Returns the shared instance
+	 * 
+	 * @return the shared instance
+	 */
+	public static JcrExplorerPlugin getDefault() {
+		return plugin;
+	}
+
+	public static ImageDescriptor getImageDescriptor(String path) {
+		return imageDescriptorFromPlugin(ID, path);
+	}
+
+	/** Returns the internationalized label for the given key */
+	public static String getMessage(String key) {
+		try {
+			return getDefault().messages.getString(key);
+		} catch (NullPointerException npe) {
+			log.warn(key + " not found.");
+			return key;
+		}
+	}
+
+	/**
+	 * Gives access to the internationalization message bundle. Returns null in
+	 * case the ClientUiPlugin is not started (for JUnit tests, by instance)
+	 */
+	public static ResourceBundle getMessagesBundle() {
+		if (getDefault() != null)
+			// To avoid NPE
+			return getDefault().messages;
+		else
+			return null;
+	}
+
+}