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https://issues.apache.org/jira/browse/WICKET-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633193#comment-13633193
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bernard commented on WICKET-4604:
---------------------------------

A simple test case is to have an exception in Application#init() then re-deploy 
the app with the code fixed.

Then in Application#setName() Wicket crashes with 
IllegalStateException("Application name can only be set once.")
because of private static final Map<String, Application> 
applicationKeyToApplication
                
> Improve Wicket code to not use static caches
> --------------------------------------------
>
>                 Key: WICKET-4604
>                 URL: https://issues.apache.org/jira/browse/WICKET-4604
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket
>    Affects Versions: 1.5.7
>            Reporter: Martin Grigorov
>
> We need to check Wicket code for any static fields which may cause problems 
> when Wicket jars are put in Web container's shared libraries folder.
> For example caches implemented with static fields should be reworked to use 
> Application's metadata.
> See http://markmail.org/thread/kd2anekvs4xlm4q4

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