Bug 198917 set __parameterpage to false for required parameter will cause wrong Exception[0705]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
int taskType )
	{
		this( engine, runnable );
		this.taskType = taskType;
	}
	/**
	 * @return Returns the locale.
	 */
	public Locale getLocale( )
	{
		return locale;
	}
	/**
	 * @return Returns the ulocale.
	 */
	public ULocale getULocale( )
	{
		return ULocale.forLocale( locale );
	}
	/**
	 * sets the task locale
	 * 
	 * The locale must be called in the same thread which create the engine task
	 * 
	 * @param locale
	 *            the task locale
	 */
	public void setLocale( Locale locale )
	{
		log.log( Level.FINE, "EngineTask.setLocale: locale={0}", locale == null