still trying (in vain) to make this fail on my setup...
The one line that looks suspicious from your stack trace is: !!!! WARNING: best effort to remove C:\DOCUME~1\Yonik\LOCALS~1\Temp\org.apache.solr.update.AutoCommitTest-testMaxDocs-1170627577515 FAILED !!!!! can you delete the directory where solr stores the testing index manually?