Quite a number of times, I receive a null pointer exception error when trying to access components with the "request" and/or "pagecontext" objects within a JSP page. Could this be related to session issues? Could this be related to using the <jsp:usebean> attribute? Here is the stack-trace dump on one of the pages: java.lang.NullPointerException at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:198) at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:132) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313) at org.apache.jsp.display$jsp._jspService(display$jsp.java:101) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service (JspServlet.java:202) at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:382) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:243) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:201) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke (StandardContext.java:2344) at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke (ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:462) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:163) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process (HttpProcessor.java:1011) at org.apache.catalina.connector.http.HttpProcessor.run (HttpProcessor.java:1106) at java.lang.Thread.run(Thread.java:484)
One additional thing...it goes away when I try to refresh the page.
Please include a reproducible test case. Thanks.
After a lot of investigation, it turns out the context class loader ended up being set to null during the first run of the JSP page (unfortunately, I failed to attach the test case), which then gives this very strange stack trace.