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
{
		ReportDesignHandle report = ( ReportDesignHandle ) runnable
				.getDesignHandle( );
		return report.getParameters( );
	}
	public ParameterHandle getParameter( String name )
	{
		ReportDesignHandle report = ( ReportDesignHandle ) runnable
				.getDesignHandle( );
		return report.findParameter( name );
	}
	public HashMap getDefaultValues( )
	{
		
		usingParameterValues( );
		final HashMap values = new HashMap( );
		
		new ParameterVisitor( )
		{
			boolean visitScalarParameter( ScalarParameterHandle param,
					Object userData )
			{
				String name = param.getName( );
				String expr = param.getDefaultValue( );
				String type = param.getDataType( );
				Object value = evaluate( expr, type );
				values.put( name, value );
				return true;
			}
			boolean visitParameterGroup( ParameterGroupHandle group,