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https://issues.apache.org/jira/browse/CXF-2954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Kulp resolved CXF-2954.
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Fix Version/s: 2.2.11
Resolution: Fixed
> Occur ConcurrentModificationException when creating mutiple WebService client
> in mutiple thread
> -----------------------------------------------------------------------------------------------
>
> Key: CXF-2954
> URL: https://issues.apache.org/jira/browse/CXF-2954
> Project: CXF
> Issue Type: Bug
> Components: Bus
> Affects Versions: 2.2.10
> Environment: CXF2.2.10, JDK1.5, Tomcat 5.5
> Reporter: Jammy chen
> Assignee: Daniel Kulp
> Fix For: 2.2.11
>
>
> The cxf application will throw ConcurrentModificationException when creating
> mutiple WebService client in mutiple thread in the same time.
> Here is to create WebService client source code:
> JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();
> factory.setServiceClass(SystemPortType.class);
> factory.setAddress(wsdlPort);
> SystemPortType isspt = (SystemPortType) factory.create();
> ((BindingProvider)
> isspt).getRequestContext().put(BindingProvider.SESSION_MAINTAIN_PROPERTY,
> true);
> Here is the ConcurrentModificationException stack track, notice only to
> create mutiple WebService client in the same time will throw this exception:
> Caused by: java.util.ConcurrentModificationException
> at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
> at java.util.AbstractList$Itr.remove(Unknown Source)
> at
> org.apache.cxf.bus.extension.ExtensionManagerImpl.activateAllByType(ExtensionManagerImpl.java:115)
> at org.apache.cxf.bus.extension.DeferredMap.undefer(DeferredMap.java:36)
> at
> org.apache.cxf.transport.DestinationFactoryManagerImpl.getDestinationFactoryForUri(DestinationFactoryManagerImpl.java:140)
> at
> org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpointInfo(AbstractWSDLBasedEndpointFactory.java:239)
> at
> org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:145)
> at
> org.apache.cxf.frontend.ClientFactoryBean.create(ClientFactoryBean.java:51)
> at
> org.apache.cxf.frontend.ClientProxyFactoryBean.create(ClientProxyFactoryBean.java:102)
> at
> org.apache.cxf.jaxws.JaxWsProxyFactoryBean.create(JaxWsProxyFactoryBean.java:121)
> I did some research and found this couses that different thread try to
> operate the map in class ExtensionManagerImpl, the map was defined
> by ConcurrentHashMap<String, ArrayList<Extension>> deferred, although
> ConcurrentHashMap is Multithread-Safe but ArrayList is not, Here is a piece
> of cxf code will trigger the exception,
> public <T> void activateAllByType(Class<T> type) {
> for (Map.Entry<String, Collection<Extension>> e :
> deferred.entrySet()) {
> Iterator<Extension> it = e.getValue().iterator();
> while (it.hasNext()) {
> Extension ex = it.next();
> if (type.isAssignableFrom(ex.getClassObject(loader))) {
> loadAndRegister(ex);
> it.remove();
> }
> }
> }
> }
> why you didn't declare this method as synchronized? I found some else methods
> both declare as synchronized such as activateAll(), activateViaNS(). so I
> tried to did some changes which declare activateAllByType() as synchronized
> everything work fine.
> This maybe your bug I hope you fix it asap, This is very important for our
> current project. really thank you
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