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
implements IScriptDataSetEventHandler
{
	private static final String OPEN = "OPEN";
	private static final String CLOSE = "CLOSE";
	private static final String FETCH = "FETCH";
	
	private static final String DESCRIBE = "DESCRIBE";
	private IScriptedDataSetEventHandler scriptedEventHandler;
	public ScriptDataSetScriptExecutor( ScriptDataSetHandle dataSetHandle,
			IReportContext reportContext )
	{
		super( dataSetHandle, reportContext );
	}
	protected void initEventHandler( String className )
	{
		super.initEventHandler( className );
		if ( eventHandler != null )
		{
			try
			{
				scriptedEventHandler = ( IScriptedDataSetEventHandler ) eventHandler;
			} catch ( ClassCastException e )
			{
				log.log( Level.WARNING, e.getMessage( ), e );