[ACCUMULO-721] Reloading of lib/ext classloader causes LinkageError

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Component/s: tserver
• Assignee: Keith Turner
• Reporter: Josh Elser
• Created: 08/Aug/12 01:52
• Updated: 25/Apr/14 18:04
• Resolved: 15/Jan/13 00:48

Description

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`