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/script/internal/ScriptDataSetScriptExecutor.java
}
	public boolean handleDescribe(IDataSetInstanceHandle dataSet, IScriptDataSetMetaDataDefinition metaData) 
			throws BirtException 
	{
		try
		{
			JSScriptStatus status = handleJS( dataSet.getScriptScope( ),
					dataSet.getName( ), DESCRIBE,
					( ( ScriptDataSetHandle ) dataSetHandle ).getDescribe() );
			if ( status.didRun( ) )
			{
				Object result = status.result( );
				if ( result instanceof Boolean )
					return ( ( Boolean ) result ).booleanValue( );
				else
					throw new DataException(
							ResourceConstants.EXPECT_BOOLEAN_RETURN_TYPE, "Describe" );
			}
			if ( scriptedEventHandler != null )
				return scriptedEventHandler.describe( 
						new DataSetInstance( dataSet ), 
						new ScriptedDataSetMetaData( metaData ) );
		} catch ( Exception e )
		{
			log.log( Level.WARNING, e.getMessage( ), e );
		}
		return false;
	}
}