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/executor/ExecutionContext.java
{
		scriptContext.exit( );
		if ( dataEngine != null )
		{
			dataEngine.shutdown( );
			dataEngine = null;
		}
	}
	/**
	 * creates new variable scope.
	 */
	public void newScope( )
	{
		scriptContext.enterScope( );
	}
	/**
	 * create a new scope, use the object to create the curren scope.
	 * 
	 * @param object
	 *            the "this" object in the new scope
	 */
	public void newScope( Object object )
	{
		Object jsObject = scriptContext.javaToJs( object );
		if ( jsObject instanceof Scriptable )
		{
			scriptContext.enterScope( (Scriptable) jsObject );
		}
		else
		{