On one page I use a persistent Hashmap. The page contains an actionLink
with a click event handler. The onclick event is activated with a delay
using setTimeout. When the event is fired another actionLink is
activated. Now what happens is that during the handling of the first
actionLink the second actionLink is activated and this results in a
ConcurrentModificationException on the Hashmap. I can solve it by using
a multithread safe Hashmap but I want to understand under what
circumstances you need to be carefull for multi threaded activation
(with Tapestry 5 that is). Should a Persisted variable always be
multithread safe? I think so but what other Tapestry related items
should be multithread safe as well?
Martijn
Stack trace:
java.util.ConcurrentModificationException
Stack trace
* java.util.HashMap
$HashIterator.nextEntry(HashMap.java:793)
* java.util.HashMap$KeyIterator.next(HashMap.java:828)
*
mitm.mimesecure.web.components.CertificateStoreGrid.downloadSelected(CertificateStoreGrid.java:76)
*
mitm.mimesecure.web.components.CertificateStoreGrid.dispatchComponentEvent(CertificateStoreGrid.java)
*
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:864)
*
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1025)
*
org.apache.tapestry5.internal.services.ComponentEventRequestHandlerImpl.handle(ComponentEventRequestHandlerImpl.java:67)
*
org.apache.tapestry5.internal.services.ImmediateActionRenderResponseFilter.handle(ImmediateActionRenderResponseFilter.java:42)
*
org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
* org.apache.tapestry5.services.TapestryModule
$37.handle(TapestryModule.java:1987)
*
org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:135)
* org.apache.tapestry5.services.TapestryModule
$12.service(TapestryModule.java:938)
*
org.apache.tapestry5.internal.services.LocalizationFilter.service(LocalizationFilter.java:42)
* org.apache.tapestry5.services.TapestryModule
$2.service(TapestryModule.java:586)
*
org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
*
org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
*
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:93)
*
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:84)
*
org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:75)
*
org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:106)
* org.apache.tapestry5.services.TapestryModule
$11.service(TapestryModule.java:918)
*
org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
*
org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
*
org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:168)
* org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
*
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
*
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
*
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
*
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
*
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
*
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
* org.mortbay.jetty.Server.handle(Server.java:324)
*
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
* org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:828)
* org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
* org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
* org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
*
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
* org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:450)
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