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
private IRenderOption renderOption;
	/**
	 * the current locale, used to localize the report content
	 */
	private Locale locale;
	
	/**
	 * report document, may be the output or input.
	 */
	private IReportDocument reportDoc;
	/**
	 * the created report content
	 */
	private IReportContent reportContent;
	/**
	 * A stack of content objects, with the current one on the top
	 */
	private Stack reportContents = new Stack( );
	/**
	 * total page
	 */
	private long totalPage;
	/**
	 * current page number
	 */
	private long pageNumber;
	/**
	 * utilities used in the report execution.
	 */
	private HashMap stringFormatters = new HashMap( );