Bug 203026 Can not export chart to doc.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
}
	/**
	 * Get engine instance.
	 * 
	 * @param servletConfig
	 * @throws BirtException
	 * 
	 */
	public synchronized static void initEngineInstance(
			ServletConfig servletConfig ) throws BirtException
	{
		initEngineInstance( servletConfig.getServletContext( ) );
	}
	/**
	 * Get engine instance.
	 * 
	 * @param servletContext
	 * @throws BirtException
	 * 
	 */
	public synchronized static void initEngineInstance(
			ServletContext servletContext ) throws BirtException
	{
		if ( ReportEngineService.instance != null )
		{
			return;
		}
		ReportEngineService.instance = new ReportEngineService( servletContext );
	}
	/**