Bug 121111 Bad event handler class name does not cause an error
Open a report design, open any Data Set's Property editor. Type in an invalid Java class name for the "Event Handler Class" property, say "aaa". Preview a report that uses that Data Set. The report executes normally. No error is shown. Event handlers are an integral part of a report design, and if a script handler class is not found, or if the handler throws a runtime exception, Report Engine should either stop the report execution, or show the error message in the generated report. (Tested with the 2005-12-15 nightly build)
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/AbstractDataEngine.java
ISubqueryDefinition subQuery = ( ISubqueryDefinition ) query;
			String subQueryName = subQuery.getName( );
			IResultIterator parentRI = parent.getResultIterator( );
			IResultIterator ri = parentRI.getSecondaryIterator( subQueryName,
					context.getSharedScope( ) );
			assert ri != null;
			resultSet = new DteResultSet( parent, subQueryName, ri, this,
					context );
			queryResultStack.addLast( resultSet );
			return resultSet;
		} catch ( BirtException e )
		{
			logger.log( Level.SEVERE, e.getMessage( ), e );
			context.addException( e );
			return null;
		}
	}
	abstract public void close( );
	abstract public void shutdown( );
	public Object evaluate( IBaseExpression expr )
	{
		if ( expr == null )
		{
			return null;
		}
		
		if ( expr.getHandle( ) != null && !queryResultStack.isEmpty( ) )
		{
			try
			{