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https://issues.apache.org/jira/browse/TAPESTRY-2037?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship reopened TAPESTRY-2037:
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Please go into your logs and capture the full exception.

Be careful ... fundamental bugs like this can throw exceptions while reporting 
an exception, try to get the true, deepest, most underlying cause exception.

> 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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