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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-721) Reloading of lib/ext classloader causes LinkageError
Date Fri, 07 Sep 2012 01:08:07 GMT


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:
>             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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