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https://issues.apache.org/jira/browse/TAP5-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833732#action_12833732
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Christophe Cordenier commented on TAP5-1017:
--------------------------------------------
Actually, the exception is not related to asset discovery but is due to filter
dispatcher strategy :
<dispatcher>REQUEST</dispatcher>
<dispatcher>ERROR</dispatcher>
My advice is to use a plain HTML page for Http error files.
BTW, I think this is due to PER_THREAD scope of request service. Redispatch the
error page request to Tapestry filter causes a new proxy to be created, but the
cleanup that is done at the end of loses the reference on the previous request
instance...
> npe thrown when using custom 404 page
> -------------------------------------
>
> Key: TAP5-1017
> URL: https://issues.apache.org/jira/browse/TAP5-1017
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.2.0
> Reporter: Jim Smart
> Priority: Minor
>
> when i have a custom 404 page, if i do the following:-
> <img src="${context:/}this-image/is-missing.jpg"/>
> and the referenced image does not exist, i would expect a silent failure /
> 404 - instead a null pointer exception like this is thrown in my ide console:-
> 2010-02-15
> 03:45:10.005:WARN::/test/assets/ctx/86d986cfc5124bd4/this-image/is-missing.jpg
> java.lang.NullPointerException
> at $Request_126cfa1aad7.getSession($Request_126cfa1aad7.java)
> at $Request_126cfa1aaa7.getSession($Request_126cfa1aaa7.java)
> at
> org.apache.tapestry5.internal.services.RestoreDirtySessionObjects.requestDidComplete(RestoreDirtySessionObjects.java:35)
> at
> org.apache.tapestry5.internal.services.EndOfRequestEventHubImpl.fire(EndOfRequestEventHubImpl.java:40)
> at
> $EndOfRequestEventHub_126cfa1aaaa.fire($EndOfRequestEventHub_126cfa1aaaa.java)
> at
> org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:917)
> at $RequestHandler_126cfa1aac5.service($RequestHandler_126cfa1aac5.java)
> at
> org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:903)
> at $RequestHandler_126cfa1aac5.service($RequestHandler_126cfa1aac5.java)
> at
> org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:85)
> at $RequestHandler_126cfa1aac5.service($RequestHandler_126cfa1aac5.java)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:81)
> at
> org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103)
> at $RequestHandler_126cfa1aac5.service($RequestHandler_126cfa1aac5.java)
> at $RequestHandler_126cfa1aabb.service($RequestHandler_126cfa1aabb.java)
> at
> org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:239)
> at
> org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
> at
> $HttpServletRequestHandler_126cfa1aabd.service($HttpServletRequestHandler_126cfa1aabd.java)
> at
> org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
> at
> $HttpServletRequestFilter_126cfa1aaba.service($HttpServletRequestFilter_126cfa1aaba.java)
> at
> $HttpServletRequestHandler_126cfa1aabd.service($HttpServletRequestHandler_126cfa1aabd.java)
> at
> org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:856)
> at
> $HttpServletRequestHandler_126cfa1aabd.service($HttpServletRequestHandler_126cfa1aabd.java)
> at
> $HttpServletRequestHandler_126cfa1aab8.service($HttpServletRequestHandler_126cfa1aab8.java)
> at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:147)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
> at
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> 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:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> 0:0:0:0:0:0:0:1%0 - - [15/Feb/2010:03:45:09 +0000] "GET
> /test/assets/ctx/86d986cfc5124bd4/this-image/is-missing.jpg HTTP/1.1" 404
> 1427 "http://localhost:8080/test/page/test"; "Mozilla/5.0 (Macintosh; U; Intel
> Mac OS X 10_6_2; en-US) AppleWebKit/532.9 (KHTML, like Gecko)
> Chrome/5.0.307.7 Safari/532.9"
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