I was getting the same error when trying to use a form (<s:form ...
>) in a jsp without first going through an action in my app.
Actually....I just fired up tomcat with the mailreader deployed.
Going directly to the welcome jsp:
http://localhost:8080/struts2-mailreader/Welcome.jsp
java.lang.NullPointerException
org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:58)
org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack
(StrutsBodyTagSupport.java:54)
org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag
(ComponentTagSupport.java:49)
org.apache.jsp.Welcome_jsp._jspx_meth_s_text_0(Welcome_jsp.java:178)
...
...
I don't know if this is unique for Struts 2.0.6, but I can confirm
that this happens in my app and in the mailreader.
--
James Mitchell
On Mar 28, 2007, at 3:18 PM, Pascal Lalonde wrote:
Hi,
We are currently trying to update from webwork to struts 2.0.6,
everything looks fine except one thing.
The application is deployed into JBoss 4.0.4 and JAAS is enabled
into our web.xml configuration file. So when trying to access the
secure namespace, it does its check and finds out that the user is
not logged yet so its redirecting to our configured JSP, into this
JSP, we have struts tags and we are applying a decorator.
With Webwork, it was working perfectly, but now, in Struts 2.0.6 we
have the following stack.
Anyone knows what we are doing wrong ?
java.lang.NullPointerException
at org.apache.struts2.views.jsp.TagUtils.getStack
(TagUtils.java:58)
at org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack
(StrutsBodyTagSupport.java:54)
at
org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag
(ComponentTagSupport.java:49)
at
org.apache.jsp.WEB_002dINF.pages.security.LoginForm_jsp._jspx_meth_ww_
text_0(LoginForm_jsp.java:273)
at
org.apache.jsp.WEB_002dINF.pages.security.LoginForm_jsp._jspx_meth_pag
e_applyDecorator_0(LoginForm_jsp.java:105)
at
org.apache.jsp.WEB_002dINF.pages.security.LoginForm_jsp._jspService
(LoginForm_jsp.java:69)
at org.apache.jasper.runtime.HttpJspBase.service
(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service
(JspServletWrapper.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile
(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service
(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke
(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest
(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward
(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward
(ApplicationDispatcher.java:301)
at
org.apache.catalina.authenticator.FormAuthenticator.forwardToLoginPage
(FormAuthenticator.java:315)
at
org.apache.catalina.authenticator.FormAuthenticator.authenticate
(FormAuthenticator.java:243)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke
(AuthenticatorBase.java:490)
at org.jboss.web.tomcat.security.JaccContextValve.invoke
(JaccContextValve.java:74)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket
(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run
(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
15:01:08,937 WARN [FormAuthenticator] Unexpected error forwarding
to login page
org.apache.jasper.JasperException: Exception in JSP: /WEB-INF/pages/
security/LoginForm.jsp:8
5: <html>
6: <head>
7: <title>
8: <ww:text name="global.title.login"/>
9: </title>
10: </head>
11: <body>
Stacktrace:
at
org.apache.jasper.servlet.JspServletWrapper.handleJspException
(JspServletWrapper.java:504)
at org.apache.jasper.servlet.JspServletWrapper.service
(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile
(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service
(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke
(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest
(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward
(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward
(ApplicationDispatcher.java:301)
at
org.apache.catalina.authenticator.FormAuthenticator.forwardToLoginPage
(FormAuthenticator.java:315)
at
org.apache.catalina.authenticator.FormAuthenticator.authenticate
(FormAuthenticator.java:243)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke
(AuthenticatorBase.java:490)
at org.jboss.web.tomcat.security.JaccContextValve.invoke
(JaccContextValve.java:74)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket
(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run
(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
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