Knut-Olav Hoven created JENA-660:
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             Summary: Concurrency issue in SPARQL when DEBUG logging is enabled
                 Key: JENA-660
                 URL: https://issues.apache.org/jira/browse/JENA-660
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 2.11.1
            Reporter: Knut-Olav Hoven


Doing multi-threaded SPARQL queries, each thread creating, building and 
querying separate models, it might still fail if DEBUG logging is enabled on 
line 84.
We hit an exception in String/StringBuilder in this setup.

Commit that hopefully fixes this issue:
 https://github.com/hovenko/jena/commit/53b815e92751af1f54b7e6cb83ad495a6cff68fa



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