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/DteDataEngine.java
if ( query == null )
			return null;
		if ( query instanceof IQueryDefinition )
		{
			Scriptable scope = context.getSharedScope( );
			IPreparedQuery pQuery = ( IPreparedQuery ) queryMap.get( query );
			assert ( pQuery != null );
			if ( pQuery != null )
			{
				try
				{
					IQueryResults queryResults = getParentQR( );
					if ( queryResults == null )
					{
						queryResults = pQuery.execute( scope );
					} else
					{
						queryResults = pQuery.execute( queryResults, scope );
					}
					IResultIterator ri = queryResults.getResultIterator( );
					assert ri != null;
					DteResultSet dRS = new DteResultSet( queryResults, this,
							context );
					rsStack.addLast( dRS );
					return dRS;
				} catch ( BirtException e )
				{
					logger.log( Level.SEVERE, e.getMessage( ), e );
					context.addException( e );
					return null;