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From Jaroslaw Cwiklik <uim...@gmail.com>
Subject Re: UIMA AS client and unkown exception classes
Date Thu, 08 Dec 2011 14:34:08 GMT
Jorn, this is an interesting bug. Current UIMA AS service code serializes
the Exception object and the client side deserializes it. The activemq
client fails in the way you describe if a class in the serialized object is
not available.
Seems like UIMA AS bug to me. UIMA AS service side should serialize the
Exception to a String and send it in a reply back to the client instead
serializing the Exception object. The client should not have any
dependencies on user code. Please create a JIRA for this.

Thanks for reporting this bug!

Jerry C

On Thu, Dec 8, 2011 at 8:22 AM, Jörn Kottmann <kottmann@gmail.com> wrote:

> Hi all,
> I have a pretty generic UIMA AS client I reuse for various
> analysis pipelines. The client gets its input from an ActiveMQ
> queue and then sends it on to my UIMA AS services via the
> UIMA AS Client API.
> The loop which is sending requests to the UIMA AS service
> is using the sendCAS method.
> Once in a while something goes wrong in one of the AEs process
> methods and it throws an exception.
> For example our Solrcas AE from the addons package might catch an
> exception and then re-throws it like this:
> throw new AnalysisEngineProcessException**(e);
> e is in this case some kind of exception which was thrown by the Solr
> client
> API.
> On my UIMA AS client I now get an exception like this:
> Dec 8, 2011 1:55:55 PM org.apache.uima.adapter.jms.**client.**
> BaseUIMAAsynchronousEngineComm**on_impl$2 onMessage
> WARNING: javax.jms.JMSException: Failed to build body from content.
> Serializable class not available to broker. Reason: java.lang.**ClassNotFoundException:
> org.apache.solr.comm
> on.SolrException
>        at org.apache.activemq.util.**JMSExceptionSupport.create(**
> JMSExceptionSupport.java:35)
>        at org.apache.activemq.command.**ActiveMQObjectMessage.**getObject(
> **ActiveMQObjectMessage.java:**186)
>        at org.apache.uima.adapter.jms.**client.**
> BaseUIMAAsynchronousEngineComm**on_impl.**retrieveExceptionFromMessage(**
> BaseUIMAAsynchronousEngineComm**on_impl.java:1075)
>        at org.apache.uima.adapter.jms.**client.**
> BaseUIMAAsynchronousEngineComm**on_impl.handleException(**
> BaseUIMAAsynchronousEngineComm**on_impl.java:1397)
>        at org.apache.uima.adapter.jms.**client.**
> BaseUIMAAsynchronousEngineComm**on_impl.handleProcessReply(**
> BaseUIMAAsynchronousEngineComm**on_impl.java:1176)
>        at org.apache.uima.adapter.jms.**client.**
> BaseUIMAAsynchronousEngineComm**on_impl$2.run(**
> BaseUIMAAsynchronousEngineComm**on_impl.java:1714)
>        at java.util.concurrent.**ThreadPoolExecutor$Worker.**
> runTask(ThreadPoolExecutor.**java:886)
>        at java.util.concurrent.**ThreadPoolExecutor$Worker.run(**
> ThreadPoolExecutor.java:908)
>        at java.lang.Thread.run(Thread.**java:662)
> Caused by: java.lang.**ClassNotFoundException: org.apache.solr.common.**
> SolrException
>        at java.net.URLClassLoader$1.run(**URLClassLoader.java:202)
>        at java.security.**AccessController.doPrivileged(**Native Method)
>        at java.net.URLClassLoader.**findClass(URLClassLoader.java:**190)
>        at java.lang.ClassLoader.**loadClass(ClassLoader.java:**306)
> Is there a way to improve this? Or do I always need to deploy all jars my
> UIMA AS service depends on
> to my client as well?
> Thanks,
> Jörn

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