Bug 190061 [Metadata] Update @since tags for new API
Patch to follow
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/Command.java
/**
	 * Adds a listener to this command that will be notified when this command's
	 * state changes.
	 * 
	 * @param commandListener
	 *            The listener to be added; must not be <code>null</code>.
	 */
	public final void addCommandListener(final ICommandListener commandListener) {
		if (commandListener == null) {
			throw new NullPointerException("Cannot add a null command listener"); 
		}
		addListenerObject(commandListener);
	}
	/**
	 * Adds a listener to this command that will be notified when this command
	 * is about to execute.
	 * 
	 * @param executionListener
	 *            The listener to be added; must not be <code>null</code>.
	 */
	public final void addExecutionListener(
			final IExecutionListener executionListener) {
		if (executionListener == null) {
			throw new NullPointerException(
					"Cannot add a null execution listener"); 
		}
		if (executionListeners == null) {
			executionListeners = new ListenerList(ListenerList.IDENTITY);
		}
		executionListeners.add(executionListener);