> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-admin/9.3-administer/troubleshooting-overview-cp/pentaho-server-issues/library-conflicts.md).

# Library conflicts

The Pentaho Server relies on many third-party libraries. These libraries provide everything from database connectivity to specific Java classes. If you have incompatible versions of any of these third-party libraries in your application server's global `lib` folder, they can cause a variety of problems related to starting and running the Pentaho Server.

Determine what versions are correct based on your needs for these third-party libraries. Some known-problematic JARs are:

* `commons-collections-3.2.jar` (from Pentaho)
* `commons-collections.jar` (from JBoss in `/jboss/server/default/lib/`)
* `jettison-1.01.jar` (from Pentaho)
* `jettison.jar` (from JBoss in `/jboss/default/deploy/jbossws.sar`)


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