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/adapter/ModelDteApiAdapter.java
IOdaDataSourceDesign newExtendedDataSource( OdaDataSourceHandle source ) 
			throws BirtException
	{
		OdaDataSourceDesign dteSource = new OdaDataSourceDesign( source
				.getQualifiedName( ) );
		IBaseDataSourceEventHandler eventHandler = new DataSourceScriptExecutor(
				source, reportContext );
		dteSource.setEventHandler( eventHandler );
		
		adaptBaseDataSource( source, dteSource );
		
		
		String driverName = source.getExtensionID( );
		if ( driverName == null || driverName.length( ) == 0 )
		{
			throw new EngineException(
					"Missing extenion id in data source definition, " + source.getName( ) ); 
		}
		dteSource.setExtensionID( driverName );
		
		Map staticProps = getExtensionProperties( source, source
				.getExtensionPropertyDefinitionList( ) );
		if ( staticProps != null && !staticProps.isEmpty( ) )
		{
			Iterator propNamesItr = staticProps.keySet( ).iterator( );
			while ( propNamesItr.hasNext( ) )
			{
				String propName = (String)propNamesItr.next( );
				assert ( propName != null );
				String propValue;