Jsp on iplanet 6.0 sp7 error: unable to load jsp class

I am having trouble to install astraweb on iplanet with following error
[06/Apr/2005:08:46:38] info (21397): WebApp service: uri = /astraweb/ contextPath = /astraweb servletPath = /index.jsp pathInfo = null servletName = jsp
[06/Apr/2005:08:46:38] info (21397): JSP11 Log:JspEngine --> /index.jsp
[06/Apr/2005:08:46:38] info (21397): JSP11 Log: ServletPath: /index.jsp
[06/Apr/2005:08:46:38] info (21397): JSP11 Log: PathInfo: null
[06/Apr/2005:08:46:38] info (21397): JSP11 Log: RealPath: /opt/iplanet60sp7/docs/astraweb/index.jsp
[06/Apr/2005:08:46:38] info (21397): JSP11 Log: RequestURI: /astraweb/
[06/Apr/2005:08:46:38] info (21397): JSP11 Log: QueryString: null
[06/Apr/2005:08:46:38] info (21397): JSP11 Log:Classpath according to the Servlet Engine is: /opt/iplanet60sp7/docs/astraweb/WEB-INF/classes:/opt/iplanet60sp7/docs/astraweb/WEB-INF/lib/Basej4.jar:/opt/iplanet60sp7/docs/astraweb/WEB-INF/lib/commons-fileupload-1.0.jar:/opt/iplanet60sp7/docs/astraweb/WEB-INF/lib/hsi.jar:/opt/iplanet60sp7/docs/astraweb/WEB-INF/lib/net.jar:/opt/iplanet60sp7/docs/astraweb/WEB-INF/lib/oreilly.jar:
[06/Apr/2005:08:46:38] info (21397): JSP11 Log:unable to load jsp class: jsps.index_jsp
[06/Apr/2005:08:46:38] failure (21397): Internal error: exception thrown from the servlet service function (uri=/astraweb/): java.lang.NullPointerException, Stack: java.lang.NullPointerException
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.isJspFileModified(JspServlet.java:231)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadJSP(JspServlet.java:199)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.access$4(JspServlet.java:171)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:596)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:919)
at com.iplanet.server.http.servlet.WebApplication.service(WebApplication.java:1058)
at com.iplanet.server.http.servlet.NSServletRunner.ServiceWebApp(NSServletRunner.java:981)
Any idea? Thanks

In the course of your troubleshooting to date, have you worked through the following document, Jeff?
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert

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Messages can always be pretty daunting when we're not sure where to start. I was able to locate the following Knowledge Base article that discusses the very message you're getting:
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