[jira] [Resolved] (CXF-7784) java.util.ConcurrentModificationException on WebTarget.request()

["Andriy Redko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CXF-7784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andriy Redko resolved CXF-7784.
-------------------------------
    Resolution: Information Provided

[~dschmoigl] The documentation section has been updated, I also added a test case to stress the Invocation.Builder methods concurrently.

> 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
>            Assignee: Andriy Redko
>            Priority: Minor
>              Labels: cxf-rt-frontend-jaxrs
>
> 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 to 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 for 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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