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Date: Wed, 6 Jun 2007 00:34:27 -0700 (PDT)
From: "Cyril Gambis (JIRA)" <jira@apache.org>
To: issues@struts.apache.org
Subject: [jira] Created: (WW-1969) Error in TagUtils (NullPointerException)
 when viewing a page which didn't go through Struts 2 interceptor stack
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Error in TagUtils (NullPointerException) when viewing a page which didn't go through Struts 2 interceptor stack
---------------------------------------------------------------------------------------------------------------

                 Key: WW-1969
                 URL: https://issues.apache.org/struts/browse/WW-1969
             Project: Struts 2
          Issue Type: Bug
          Components: Views
    Affects Versions: 2.0.6
         Environment: Tomcat 4.1
Java 1.4
Struts 2 - Java 1.4 retrotranslated version
            Reporter: Cyril Gambis
            Priority: Critical


I searched for that item and havn't find anything in JIRA. I think there may be a patch because it is quite a serious issue and it is a regression from Struts 2.0.5 as I read on some forum.

With this bug, some HelloWorld tutorials don't work anymore.

The stack trace is:

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrappe r.java:467)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause

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.WebContent.index_jsp._jspx_meth_s_005fhead_005f0(index_jsp.java: 155)
org.apache.jsp.WebContent.index_jsp._jspService(index_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 

I understand that if you access directly a jsp page containing a tag like s:text, s:a or s:url, which usually won't need for a value stack. A solution may be to have everything go through the struts 2 interceptor stack, but believe me, for legacy application it is sometimes not easy at all (one of my developer has work on this problem for 2 days, currently).

Is there any patch, anywhere? Especially for the Java 1.4 version or Struts 2?

Some links:
http://forums.opensymphony.com/thread.jspa?messageID=155149&#155149
http://www.mail-archive.com/user@struts.apache.org/msg57582.html


Thanks!
Cyril Gambis

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