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From "Roland Knight (JIRA)" <j...@apache.org>
Subject [jira] Created: (CAMEL-2692) Multithreading bug: getBody sporadically returns null
Date Wed, 05 May 2010 04:58:37 GMT
Multithreading bug: getBody sporadically returns null
-----------------------------------------------------

                 Key: CAMEL-2692
                 URL: https://issues.apache.org/activemq/browse/CAMEL-2692
             Project: Apache Camel
          Issue Type: Bug
          Components: camel-core
    Affects Versions: 2.3.0
         Environment: JDK 6
            Reporter: Roland Knight


Note that the only workaround for this bug is to remove the parallelProcessing() call in the
builder.

I have a simple route that processes a file by splitting on a tag and processing the DOM of
each split message. The problem is that getBody is randomly returning null but ONLY when using
the parallelProcessing feature of split. For some runs of the same XML file, the error does
not occur at all (the file is about 2MB of data), others it will happen once or twice. I am
currently using the latest 2.3-SNAPSHOT. 

Also note, that after detecting the null, I tried calling getBody(String.class) - this also
may return null. Sometimes it does return the proper XML. 

Route configuration that reproduces the problem (my input XML is about 2MB with about 500
article tags): 

        public void configure() throws Exception { 
          from("file:D:/inbox") 
            .split(new XPathBuilder("//article")) 
              .parallelProcessing()                     // remove this line getBody below
never returns null 
              .process(new Processor() { 
                public void process(Exchange exchange) throws Exception { 
                  Message inMessage = exchange.getIn(); 
                  org.w3c.dom.Document domDocument = inMessage.getBody(org.w3c.dom.Document.class);

                  if (domDocument == null) { 
                    log("Null body"); 
                  } else { 
                    // process DOM here 
                  } 
                } 
              }) 
            .end() 
        } 
      }); 


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