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https://issues.apache.org/jira/browse/TAPESTRY-2037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577044#action_12577044
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Robert Zeigler commented on TAPESTRY-2037:
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Long delay; apologies. After upgrading to 5.0.11-SNAPSHOT, there were various
things that needed changing, and new features that needed to be added, so it
took a while to put an app where I frequently see this exception onto the boxes
where I see it. I was able to put that up over the weekend. Crossing my fingers
that the NPE go away; typically, I see several per day. Ironically, the next
two weeks will be slow in terms of app usage. If I see the NPE again, I'll
comment (so we know it's not fixed). During a typical-usage day, I see the NPE
several times. So if I haven't seen it after the end of three weeks, I think
it's fair to call it fixed.
Crossing my fingers.
> NullPointerException caused by many rapid page refreshes
> --------------------------------------------------------
>
> Key: TAPESTRY-2037
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2037
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core, tapestry-ioc
> Affects Versions: 5.0.7
> Environment: jdk 1.5
> Reporter: Howard M. Lewis Ship
> Assignee: Howard M. Lewis Ship
> Priority: Critical
> Fix For: 5.0.12
>
>
> This was reported on the mailing list.
> In certain places, hitting the refresh button rapidly can cause a null
> pointer exception.
> It is believed this is related to a JDK 1.5 bug:
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6550283
> Tapestry makes a few uses of ThreadLocal that are consistent with this
> pattern. ThreadLocals are used to connect service proxies to perthread scope
> services.
> We will locate all useages of ThreadLocal and, alas, synchronize access to
> them.
> More discussion: http://markmail.org/message/7bwztu66paz2cfqm
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