xstream and ibm j9 sdk incompatibilities on linux

Posted by Yoni on Stack Overflow See other posts from Stack Overflow or by Yoni
Published on 2010-06-02T12:14:11Z Indexed on 2010/06/03 21:04 UTC
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java

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ibm

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xstream

I encountered an incompatibility with xstream and IBM J9 jdk (the 32bits version). Everything worked fine when I used sun jdk but fails on IBM jdk (on linux only. on windows it's ok with both jdks).

When debugging, the error appears to be that xstream uses a java.util.TreeSet internally but the set's iterator returns elements in the wrong order (I know this sounds very strange, but this is the behavior that I saw). Googling for related bugs didn't give any meaningful results

I tried upgrading pretty much any component possible but no luck. I tried the following configurations:

ibm jdk 1.6 SR 7 (bundled with WebSphere 7.0.0.9), xstream 1.2.2
ibm jdk 1.6 SR 8, xstream 1.2.2
ibm jdk 1.6 SR 8, xstream 1.3.1

(I tried those both with tomcat and with WebSphere server, so actually there are 6 configurations using IBM jdk).

The code in question is in class com.thoughtworks.xstream.core.DefaultConverterLookup, around line 44. It uses an iterator from class com.thoughtworks.xstream.core.util.PrioritizedList, which uses a custom comparator, but all the comparator does is compare integers (the priorities).

Has anyone seen this before? Any idea what can I do or change?

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