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https://issues.apache.org/jira/browse/UIMA-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922306#action_12922306
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Marshall Schor commented on UIMA-1746:
--------------------------------------

Note: the fix I did doesn't check to see if the url connection is a "jar" type 
- it just sets this flag.  This might make it work for "file" connections (but 
I don't know if it's broken for those), and it might "slow down" repeated 
accessing of the same http: URLs, although, if the URL contents might change, 
perhaps this also should not be cached, anyways.

> Lock with org.apache.uima.utils.XmlInputSource (uimaj-core)
> -----------------------------------------------------------
>
>                 Key: UIMA-1746
>                 URL: https://issues.apache.org/jira/browse/UIMA-1746
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 2.2.2, 2.3
>         Environment: Tested on Windows, but should appear also on UNIX 
> platforms.
>            Reporter: Baptiste Gaillard
>            Priority: Minor
>             Fix For: 2.3.1SDK
>
>         Attachments: UIMA-1746-TEST.zip, UIMA-1746.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> See: http://uima.markmail.org/thread/4h7ljnaz26v4jicl
> XmlInputSource.close() locks the JARs where a JARUrlConnection is used. 
> This bug is described in the SUN bug database: 
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4386865
> To fix that we only have to insert the following lines before each 
> 'URL.openStream()' call: 
>     URLConnection urlConnection = mURL.openConnection();
>     if(urlConnection instanceof JarURLConnection) 
>     {
>         ((JarURLConnection) mURL.openConnection()).setDefaultUseCaches(false);
>     }

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