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
abstract protected IResultSet doExecute( IBaseQueryDefinition query );
	protected IResultSet getParentResultSet( )
	{
		for ( int i = queryResultStack.size( ) - 1; i >= 0; i-- )
		{
			DteResultSet rs = ( DteResultSet ) queryResultStack.get( i );
			if ( rs.getQueryResults( ) != null )
				return rs;
		}
		return null;
	}
	protected boolean validateQueryResult( IQueryResults queryResults )
			throws BirtException
	{
		IResultIterator riter = queryResults.getResultIterator( );
		assert riter != null;
		return riter != null;
	}
	protected IResultSet getSubqueryResult( IBaseQueryDefinition query )
	{
		
		
		assert query instanceof ISubqueryDefinition;
		if ( queryResultStack.isEmpty( ) )
			return null;
		assert ( queryResultStack.getLast( ) instanceof DteResultSet );
		DteResultSet resultSet;
		try
		{
			DteResultSet parent = ( DteResultSet ) queryResultStack.getLast( );