[
http://www.stripesframework.org/jira/browse/STS-563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ben Gunter closed STS-563.
--------------------------
> Possible race condition with flash scope
> ----------------------------------------
>
> Key: STS-563
> URL: http://www.stripesframework.org/jira/browse/STS-563
> Project: Stripes
> Issue Type: Bug
> Components: ActionBean Dispatching
> Affects Versions: Release 1.4.3
> Reporter: Ben Gunter
> Assignee: Ben Gunter
> Priority: Critical
> Fix For: Release 1.5
>
>
> From the mailing list:
> Hello,
> I do redirect and then forward in my code, and it works in most
> cases. But sometime (in cca 20% of requests) I get ClassCastException.
> The problem occurs not always on the same place, so I'm not able to
> write steps to reproduce it - it looks like concurrent access to the
> request (wrappers) from more threads. If I make reload of page after
> the exception it works fine.
> I use Stripes 1.4.3 on Jetty 6.1.8, ActionResolver configured for
> .html suffix. Here is my code:
> web.xml:
> <filter-mapping>
> <filter-name>StripesFilter</filter-name>
> <servlet-name>StripesDispatcher</servlet-name>
> <dispatcher>REQUEST</dispatcher>
> <!-- i've tried also this but it didn't help
> <dispatcher>FORWARD</dispatcher>
> -->
> </filter-mapping>
> <servlet>
> <servlet-name>StripesDispatcher</servlet-name>
>
> <servlet-class>net.sourceforge.stripes.controller.DispatcherServlet</servlet-class>
> <load-on-startup>1</load-on-startup>
> </servlet>
> <servlet-mapping>
> <servlet-name>StripesDispatcher</servlet-name>
> <url-pattern>*.html</url-pattern>
> </servlet-mapping>
> ============================================
> JSP:
> <s:form action="/SelectObjects.html" name="objectsForm">
> <s:submit name="searchNew">Search</s:submit>
> </s:form>
> ============================================
> SelectObjectsActionBean.java:
> @DefaultHandler
> public Resolution begin() {
> return new ForwardResolution("/WEB-INF/jsp/objectList.jsp");
> }
> public Resolution search() {
> return new ForwardResolution("/WEB-INF/jsp/searchForm.jsp");
> }
> public Resolution searchNew() {
> // some logic here
> return new RedirectResolution("/SelectObjects.html?search=").flash(this);
> }
> ============================================
> Stack trace:
> java.lang.ClassCastException: org.mortbay.jetty.Request
> at
> net.sourceforge.stripes.controller.StripesFilter.flashInbound(StripesFilter.java:222)
> at
> net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:179)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
> at
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:324)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
> Do you have any idea, what could be wrong?
> Thanks in advance for your help.
> Best regards,
> -- Josef Cacek
> **************
> When StripesFilter is cleaning up after a request and an ActionBean is to be
> flashed, it will swap out the ActionBeanContext's request for a FlashRequest.
> On the ensuing request, it will look up the bean in flash scope and swap in
> the new request. But if the cleanup didn't finish before the new request
> comes in, it can cause a ClassCastException.
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