ConcurrentModificationException when getting Client/EndpointConfig from ServerConfig

[...]
Caused by: org.jboss.wsf.spi.WSFException: Cannot create service
at org.jboss.wsf.spi.WSFException.rethrow(WSFException.java:55)
at org.jboss.ws.common.serviceref.AbstractServiceObjectFactoryJAXWS.getObjectInstance(AbstractServiceObjectFactoryJAXWS.java:123)
at org.jboss.as.webservices.webserviceref.WSRefValueSource.getValue(WSRefValueSource.java:75)
... 58 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.ws.common.serviceref.AbstractServiceObjectFactoryJAXWS.instantiatePort(AbstractServiceObjectFactoryJAXWS.java:198)
at org.jboss.ws.common.serviceref.AbstractServiceObjectFactoryJAXWS.getObjectInstance(AbstractServiceObjectFactoryJAXWS.java:111)
... 59 more
Caused by: java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at org.jboss.wsf.stack.cxf.client.ProviderImpl$JBossWSServiceImpl.createPort(ProviderImpl.java:472)
at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:336)
at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:323)
at javax.xml.ws.Service.getPort(Service.java:99)
at org.jboss.test.ws.jaxws.jbws1841.EndpointService.getEndpointPort(EndpointService.java:41)
... 65 mor