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/api/impl/GetParameterDefinitionTask.java
if ( !fixedOrder )
			Collections.sort( choices, new SelectionChoiceComparator( true ) );
		return choices;
	}
	/**
	 * The first step to work with the cascading parameters. Create the query
	 * definition, prepare and execute the query. Cache the iterator of the
	 * result set and also cache the IBaseExpression used in the prepare.
	 * 
	 * @param parameterGroupName -
	 *            the cascading parameter group name
	 */
	public void evaluateQuery( String parameterGroupName )
	{
		CascadingParameterGroupHandle parameterGroup = getCascadingParameterGroup( parameterGroupName );
		if ( dataCache == null )
			dataCache = new HashMap( );
		if ( parameterGroup == null )
			return;
		DataSetHandle dataSet = parameterGroup.getDataSet( );
		if ( dataSet != null )
		{
			try
			{
				
				DataEngine dataEngine = getDataEngine( );
				DataSourceHandle dataSource = dataSet.getDataSource( );
				ModelDteApiAdapter adaptor = new ModelDteApiAdapter(
						executionContext.getReportContext(), 
						executionContext.getSharedScope() );