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Date: Fri, 7 Sep 2012 12:08:07 +1100 (NCT)
From: "Christopher Tubbs (JIRA)" <jira@apache.org>
To: dev@accumulo.apache.org
Message-ID: <1086873338.47809.1346980087636.JavaMail.jiratomcat@arcas>
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Subject: [jira] [Commented] (ACCUMULO-721) Reloading of lib/ext classloader
 causes LinkageError
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    [ https://issues.apache.org/jira/browse/ACCUMULO-721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450244#comment-13450244 ] 

Christopher Tubbs commented on ACCUMULO-721:
--------------------------------------------

Which released versions are affected by this bug?
                
> Reloading of lib/ext classloader causes LinkageError
> ----------------------------------------------------
>
>                 Key: ACCUMULO-721
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-721
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Josh Elser
>            Assignee: Keith Turner
>         Attachments: ACCUMULO-721-classpath, ACCUMULO-721-tserver.debug.log
>
>
> I was writing an iterator that takes advantage of some classes in Google's guava-libraries. I placed my jar and the guava-13.0-rc2.jar into lib/ext.
> I then ran a simple Java class which opened a Scanner to a table with my customer Iterator in Eclipse. The first attempt succeeded. I then changed my iterator, recompiled the jar, and placed it in lib/ext. The AccumuloClassLoader message said it picked up the changes. Then, trying to run my class in the same manner, I got a java.lang.LinkageError relating to the classloader having two different Class objects for a class defined in the guava jar (which hadn't changed).
> Moving the guava jar from lib/ext to lib/ and retrying this experiment did not net the same LinkageError.
> I'll attach full stack traces and the output of `accumulo classpath`

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