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
}
	/**
	 * get a string formatter object
	 * 
	 * @param value
	 *            string format
	 * @return formatter object
	 */
	public StringFormatter getStringFormatter( String value )
	{
		StringFormatter fmt = (StringFormatter) stringFormatters.get( value );
		if ( fmt == null )
		{
			fmt = new StringFormatter( value, locale );
			stringFormatters.put( value, fmt );
		}
		return fmt;
	}
	/**
	 * get a number formatter object
	 * 
	 * @param value
	 *            number format
	 * @return formatter object
	 */
	public NumberFormatter getNumberFormatter( String value )
	{
		NumberFormatter fmt = (NumberFormatter) numberFormatters.get( value );
		if ( fmt == null )
		{