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From "Ivan Lagunov (JIRA)" <>
Subject [jira] [Created] (COCOON-2340) XMLByteStreamCompiler in not thread-safe
Date Wed, 27 Nov 2013 14:57:35 GMT
Ivan Lagunov created COCOON-2340:

             Summary: XMLByteStreamCompiler in not thread-safe
                 Key: COCOON-2340
             Project: Cocoon
          Issue Type: Bug
          Components: * Cocoon Core
    Affects Versions: 2.2
            Reporter: Ivan Lagunov

I'm periodically getting the following exceptions in different places:

Caused by: java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(Native Method)
        at org.apache.cocoon.components.sax.XMLByteStreamCompiler.getSAXFragment(
        at org.apache.cocoon.components.pipeline.impl.ExpiresCachingProcessingPipeline.processXMLPipeline(

After debugging I've found the root cause. It happens due to multi-threading when one thread
allocates newbuf array, then another thread increments bufCount in write method and then the
first thread fails on System.arraycopy invocation.

I suggest making getSAXFragment and write methods synchronized. It should resolve the issue.
If it helps, I'll provide a patch later.

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