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
*/
	private long totalPage;
	/**
	 * current page number
	 */
	private long pageNumber;
	/**
	 * A list of script errors found in onPrepare. These will be added to the
	 * IReportContent, when one is available
	 * 
	 */
	private List onPrepareErrors = new ArrayList( );
	/**
	 * Flag to indicate whether task is canceled.
	 */
	private boolean isCancelled = false;
	
	/**
	 * flag to indicate if the task should be canceled on error
	 */
	private boolean cancelOnError = false;
	
	/**
	 * utilities used in the report execution.
	 */
	private HashMap stringFormatters = new HashMap( );
	private HashMap numberFormatters = new HashMap( );
	private HashMap dateFormatters = new HashMap( );
	private ClassLoader applicationClassLoader;