Hi, here is the scenario I have. I have a J2EE app. The url is: http://localhost/dnsmanager/report.screen. In the web/WEB-INF/web.xml, *.screen is mapped to TemplateServlet, and TemplateServlet is mapped to com.mycompany.j2ee.web.template.Template class which is resided in web/WEB-INF/classes folder. In the Template class, report.screen is forwarded to a physical JSP page web/docroot/report.jsp. In the jsp page, I need display an applet ReportChart, the class of which is com.mycompany.j2ee.web.chart.ReportChart class which is resided in web/WEB-INF/classes folder. For the applet tag, I need specify the code base. <applet code="com.mycompany.j2ee.web.chart.ReportChart.class" CODEBASE="???" width=460 height=300> </applet> What should I put for the codebase value? The applet specifies the codebase should be the diff dir between jsp page and applet class. I tried: CODEBASE="" (no codebase) CODEBASE="dnsmanager/web/WEB-INF/classes" (relative to web server root dir) CODEBASE="../../../../../" (relative to Template file) CODEBASE="../WEB-INF/classes" (relative to JSP file dir) But none of them worked out -- always class not found error. Urgent help is greatly appreciated.