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https://issues.apache.org/jira/browse/TAPESTRY-2037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560823#action_12560823
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Howard M. Lewis Ship commented on TAPESTRY-2037:
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>From the mailing list:
nterestingly, I can't reproduce the issue on OS X, either. The
servers where I see the exceptions are debian linux servers, running
sun's jdk, version 1.5.0_09-b01 on one server, 1.5.0_10 on another,
and 1.5.0_12-b04 on another. All three machines are dual processor
machines.
The server where I most frequently see the exception is the one
running jdk 1.5.0_09-b01. But it's also the box with the most traffic
by far, so it's probably that the frequency of exceptions is a
function of the use of the box, rather than the version.
I've got a small test app that I'm going to try running on the box to
see if I can recreate the bug on linux, since I can't duplicate it on
os x.
> 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: 5.0.8
>
>
> 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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