Dominic Schmoigl created CXF-7784:
-------------------------------------
Summary: java.util.ConcurrentModificationException on
WebTarget.request()
Key: CXF-7784
URL: https://issues.apache.org/jira/browse/CXF-7784
Project: CXF
Issue Type: Bug
Components: JAX-RS
Affects Versions: 3.1.14
Environment: * Hystrix 1.5.9
* Spring-Boot 1.5.14
* JAXRS 3.1.14
Reporter: Dominic Schmoigl
By chance we stumbled over a case, where calling
{code:java}
webTarget.request(){code}
sometimes may lead to a {{java.util.ConcurrentModificationException}}, if the
{{webTarget}} is created in one thread, but the call to {{.request()}} is
performed in multiple concurrent threads afterwards. In our environment it was
possible provoke the exception with probability of ~10% if run with 4 threads
in parallel.
The callstack which we could isolate was:
{code:java}
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at
org.apache.cxf.jaxrs.provider.ProviderFactory.injectContextProxies(ProviderFactory.java:638)
at
org.apache.cxf.jaxrs.provider.ProviderFactory.setCommonProviders(ProviderFactory.java:600)
at
org.apache.cxf.jaxrs.client.ClientProviderFactory.setProviders(ClientProviderFactory.java:74)
at
org.apache.cxf.jaxrs.provider.ProviderFactory.setUserProviders(ProviderFactory.java:791)
at
org.apache.cxf.jaxrs.client.spec.ClientImpl$WebTargetImpl.request(ClientImpl.java:282)
at <<custom-coding-which-calls-webTarget.request()>>
{code}
We currently have a workaround with
{code:java}
synchronized (webTarget) {
webTarget.request();
}
{code}
which isn't perfect, but good enough in our case.
Is this case known to you? We did not try to reproduce the issue in isolation,
yet (as it was hard enough to find it in our application already). If we should
give it a try, please notify us.
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