[TAPESTRY-174] 'page' JSP tag throws NPE when page accessed via multipart form submission

• Type: Bug
• Status: Resolved
• Resolution: Won't Fix
• Affects Version/s: 3.0
• Component/s: Framework
• Environment: Operating System: Other; Platform: Other
• Bugzilla Id: 29132
• Assignee: Unassigned
• Reporter: Colin Sampaleanu
• Created: 21/May/04 05:23
• Updated: 10/Mar/06 10:09
• Resolved: 10/Mar/06 10:09

Description

I have an app that is half Tapestry and half (sigh...) Struts. On a common link
bar I use the tapestry page tag to create some links to some tapestry pages, as
follows:

<tapestry:page servlet='/auth' page='ManageUsers'>Users</tapestry:page>

If I have a JSP page which does a multi-part form post to an action, and then
that action does a normal forward to the display page, which then includes the
above tag definition, I get a null pointer exception, as Tapestry wants to use
the DefaultMultiPartFormDecoder, but the submission was not actually from tapestry.

I think this line returns null
return (Map) request.getAttribute(PART_MAP_ATTRIBUTE_NAME);
which then causes a NPE on attempted usage of the partMap.

Very very nasty. Is there any easy workaround? Stack trace follows:

2004-05-20 17:55:33,974 ERROR [org.jboss.web.localhost.Engine]
ApplicationDispatcher[/qa-portal] Servlet.service() for servlet qaportal threw
exception
java.lang.NullPointerException
at
org.apache.tapestry.multipart.DefaultMultipartDecoder.cleanup(DefaultMultipartDecoder.java:120)
at org.apache.tapestry.request.RequestContext.cleanup(RequestContext.java:506)
at org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:285)
at org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:326)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:575)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:498)
at org.apache.tapestry.jsp.URLRetriever.insertURL(URLRetriever.java:82)
at org.apache.tapestry.jsp.AbstractLinkTag.doStartTag(AbstractLinkTag.java:105)
at
org.apache.jsp.jadmfeditor_jsp._jspx_meth_tapestry_page_0(jadmfeditor_jsp.java:1706)
at
org.apache.jsp.jadmfeditor_jsp._jspx_meth_authz_authorize_4(jadmfeditor_jsp.java:1679)
at org.apache.jsp.jadmfeditor_jsp._jspService(jadmfeditor_jsp.java:255)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)