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From "Dan Salt (JIRA)" <>
Subject [jira] [Created] (CXF-7135) ConcurrentModificationException
Date Wed, 16 Nov 2016 12:35:58 GMT
Dan Salt created CXF-7135:

             Summary: ConcurrentModificationException 
                 Key: CXF-7135
             Project: CXF
          Issue Type: Bug
          Components: JMS
    Affects Versions: 3.0.11
         Environment: Mac OSX 10.11.6. 
Java JDK 1.8.0_71 (64 bit Server)
            Reporter: Dan Salt

Our platform allows the user to switch transports for a particular proxy based on configuration.
We currently allow HTTP and JMS as possible options.

During recent performance testing, we've hit a bug which causes JAXRS Clients over JMS to
fail with a ConcurrentModificationException:

A test case is attached that reproduces our problem.

Our test executes requests across multiple concurrent threads, switching between JMS and HTTP
for both JAXWS and JAXRS Client Proxies. In the test case, executing JAXWS over JMS works
fine, both in single and multi-threaded tests. JAXRS works fine across single and multi-threaded
tests over HTTP with the 'ThreadSafe' flag set on the Client Factory. But when the transport
is switched to JMS two problems occur:

1) The ConnectionFactoryFeature fails to properly set the JMS Conduit and results in an error
because no Connection Factory is set. This is because in JAXRS Clients, the InterceptorProvider
is neither a Client or Server, it is a ClientConfiguration, so the JMS ConnectionFactoryFeature
does not fire either of it's methods. 

We have worked around this in our code by sub-classing and overriding the method:
public void initialize(InterceptorProvider interceptorProvider, Bus bus)

.. and adding code similar to that in the ConnectionFactory feature. This resolves the missing
ConnectionFactory problem.

2) Under multi-threaded conditions, the JAXRS Clients fail with the following exception: Problem with reading the data, class java.lang.String,
ContentType: text/plain.
	at org.apache.cxf.jaxrs.impl.ResponseImpl.reportMessageHandlerProblem(
	at org.apache.cxf.jaxrs.impl.ResponseImpl.doReadEntity(
	at org.apache.cxf.jaxrs.client.AbstractClient.readBody(
	at org.apache.cxf.jaxrs.client.ClientProxyImpl.handleResponse(
	at org.apache.cxf.jaxrs.client.ClientProxyImpl.doChainedInvocation(
	at org.apache.cxf.jaxrs.client.ClientProxyImpl.invoke(
	at com.sun.proxy.$Proxy24.doSimpleMethod(Unknown Source)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(
	at java.util.HashMap$
	at java.util.HashMap$
	at java.util.HashMap.putMapEntries(
	at java.util.HashMap.putAll(
	at org.apache.cxf.message.MessageImpl$1.putAll(
	at org.apache.cxf.message.MessageImpl.calcContextCache(
	at org.apache.cxf.message.MessageImpl.getContextualProperty(
	at org.apache.cxf.jaxrs.impl.HttpHeadersImpl.getRequestHeaders(
	at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBodyReader(
	at org.apache.cxf.jaxrs.impl.ResponseImpl.doReadEntity(
	... 7 more

This occurs even though the 'ThreadSafe' property is set via:


I've done quite a large amount of digging through the code to try and narrow down the scope
of the problem, and the results above is as far as I could get, unfortunately.

Finally, one important factor is that this error only happens on the latest 3.0.x release
(3.0.11). When I switch my test case to 3.1.8, it does NOT occur. Not sure if this equates
to a fix not being back-ported, or a fundamental difference in functionality. Sadly, we're
not able to yet move to 3.1.x, because of running inside the Karaf container, and our dependencies
on Camel and Spring 3.x.

Thanks. Please let me know if you need any other information.

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