Bug 209309 Show javascript errorposition
If a javascript expression has errors, the error message is shown in the last lines in the preview tab. But there is no info where the error occurs. In most cases you had to guess the error location. It would be very helpfull to display the error location.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
/**
	 * @return Returns the action handler.
	 */
	public IHTMLImageHandler getImageHandler( )
	{
		return renderOption.getImageHandler( );
	}
	
	/**
	 * return application class loader.
	 * The application class loader is used to load the report item event handle and 
	 * java classes called in the javascript.
	 * @return class loader
	 */
	public ClassLoader getApplicationClassLoader( )
	{
		return applicationClassLoader;
	}
	/**
	 * the application class loader.
	 * 
	 * The class loader first try to the load the class as following sequence:
	 * <li>1. standard java class loader,
	 * <li>2. classloader setted through the appContext.
	 * <li>3. CLASSPATH setted by WEBAPP_CLASSPATH_KEY
	 * <li>4. PROJECT_CLASSPATH_KEY
	 * <li>5. WORKSAPCE_CLASSPATH_KEY
	 * <li>6. JARs define in the report design
	 */
	static private class ApplicationClassLoader extends ClassLoader