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
/**
	 * task ID string
	 */
	private String taskIDString;
	/**
	 * execution mode, in this mode, the render operation should be executed.
	 */
	private boolean presentationMode = false;
	/**
	 * execution mode, in this mode, the genreation opration should be executed.
	 */
	private boolean factoryMode = true;
	
	/**
	 * The scripting context, used to evaluate the script.
	 */
	private ScriptContext scriptContext;
	/**
	 * data engine, used to evaluate the data related expressions.
	 */
	private IDataEngine dataEngine;
	/**
	 * utility used to create the report content
	 */
	private ReportExecutor executor;
	/**
	 * utility used to create the TOC
	 */
	private TOCBuilder tocBuilder;