Bug 180118 Enhance to print out source stack trace in preview mode.[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/servlet/ViewerServlet.java
HttpServletResponse response ) throws BirtException
	{
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		BirtReportServiceFactory.getReportService( ).setContext(
				getServletContext( ), options );
		return new BirtContext( request, response );
	}
	/**
	 * Local process http request with GET method.
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @exception ServletException
	 * @exception IOException
	 * @return
	 */
	protected void __doGet( IContext context ) throws ServletException,
			IOException, BirtException
	{
		IFragment activeFragment = null;
		String servletPath = context.getRequest( ).getServletPath( );
		if ( IBirtConstants.SERVLET_PATH_FRAMESET
				.equalsIgnoreCase( servletPath ) )
		{
			activeFragment = viewer;
		}
		else if ( IBirtConstants.SERVLET_PATH_RUN