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Posted to issues@lucene.apache.org by "Andrzej Bialecki (Jira)" <ji...@apache.org> on 2019/12/15 20:21:00 UTC
[jira] [Commented] (SOLR-14088) Tika and commons-compress
dependency in solr core causes classloader issue
[ https://issues.apache.org/jira/browse/SOLR-14088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16996871#comment-16996871 ]
Andrzej Bialecki commented on SOLR-14088:
-----------------------------------------
The exception and the stacktrace that was mentioned in the other issue (\{{Could not initialize...}}) doesn't actually show the underlying first cause of the issue. Was it a {{ClassNotFoundException}}? Or was it rather a {{ClassCastException}}?
If it was the former then it means that the loading was attempted from a classloader that didn't have access to all dependencies.
If it's the latter it probably means that the class was already loaded by an incompatible (sibling or child) classloader and it became visible to the parent classloader that also loaded the same class. This happens if a common dependency is accidentally put both into a child classloader and a parent classloader, and if the class loading is executed child-first - then the common dependency classes are loaded twice by different classloaders, and by definition they are incompatible (even though the underlying bytecode is the same).
> Tika and commons-compress dependency in solr core causes classloader issue
> --------------------------------------------------------------------------
>
> Key: SOLR-14088
> URL: https://issues.apache.org/jira/browse/SOLR-14088
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - Solr Cell (Tika extraction)
> Reporter: Kevin Risden
> Priority: Major
>
> SOLR-14086 found that if commons-compress is in core ivy.xml as a compile dependency, it messes up the classloader for any commons-compress dependencies. It causes issues with items like xz being loaded.
> This is problematic where dependencies shouldn't matter based on classloader. This jira to to determine if there is something wrong w/ Solr's classloader or if its a commons-compress issue only.
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