Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
}
	/**
	 * sets the task context
	 * 
	 * @param context
	 *            the task context
	 */
	public void setAppContext( Map context )
	{
		HashMap appContext = new HashMap( );
		HashMap sysAppContext = engine.getConfig( ).getAppContext( );
		if ( sysAppContext != null )
		{
			appContext.putAll( sysAppContext );
		}
		if ( context != null )
		{
			appContext.putAll( context );
		}
		executionContext.setAppContext( appContext );
		StringBuffer logStr = null;
		if ( log.isLoggable( Level.FINE ) )
			logStr = new StringBuffer( );
		
		if ( !appContext.isEmpty( ) )
		{
			Set entries = appContext.entrySet( );
			for ( Iterator iter = entries.iterator( ); iter.hasNext( ); )
			{
				Map.Entry entry = (Map.Entry) iter.next( );