Weblogic stuck thread in JAX-WS Client

My web application front end runs on its own dedicated weblogic server. My webservices are deployed on a different server machine, on weblogic. I consume webservices this way: URL url = new URL("http://xxx:7001/corpevent/rightsservice?wsdl"); QName qname = new QName("http://corpevent.service.org/", "rightsservice"); Service service = Service.create(url, qname); RightsIssueService ri = service.getPort(org.service.corpevent.RightsIssueService.class); ri.callMethod(); It works fine, but sometimes I get stuck thread issues. I have tried to figure out how to stop it from happening but everything I've tried hasn't worked so far. Here is the stack trace: "[STUCK] ExecuteThread: '28' for queue: 'weblogic.kernel.Default (self-tuning)'" Id=138 BLOCKED on org.eclipse.persistence.jaxb.JAXBContext@bbec059 owned by "[STUCK] ExecuteThread: '4' for queue: 'weblogic.kernel.Default (self-tuning)'" Id=67 at org.eclipse.persistence.jaxb.JAXBContext.newContextState(JAXBContext.java:270) - blocked on org.eclipse.persistence.jaxb.JAXBContext@bbec059 at org.eclipse.persistence.jaxb.JAXBContext.refreshMetadata(JAXBContext.java:255) at org.eclipse.persistence.jaxb.JAXBContext.jrCheckReload(JAXBContext.java) at org.eclipse.persistence.jaxb.JAXBContext.createMarshaller(JAXBContext.java) at com.sun.xml.ws.db.toplink.JAXBContextWrapper$1.newInstance(JAXBContextWrapper.java:85) at com.sun.xml.ws.db.toplink.JAXBContextWrapper$1.newInstance(JAXBContextWrapper.java:82) at com.sun.xml.ws.db.toplink.ObjectPool.allocate(ObjectPool.java:65) at com.sun.xml.ws.db.toplink.JAXBBond.marshal(JAXBBond.java:128) at com.sun.xml.ws.message.jaxb.JAXBHeader.writeTo(JAXBHeader.java:200) at com.sun.xml.ws.message.AbstractMessageImpl.writeToBodyStart(AbstractMessageImpl.java:178) at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:191) at com.sun.xml.ws.api.message.MessageWrapper.writeTo(MessageWrapper.java:226) at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:144) at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:242) at com.sun.xml.ws.transport.http.client.HttpTransportPipe.process(HttpTransportPipe.java:225) at com.sun.xml.ws.transport.http.client.HttpTransportPipe.processRequest(HttpTransportPipe.java:145) at com.sun.xml.ws.transport.DeferredTransportPipe.processRequest(DeferredTransportPipe.java:110) at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:1136) at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:1050) at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:1019) at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:877) at com.sun.xml.ws.client.Stub.process(Stub.java:463) at com.sun.xml.ws.client.sei.SEIStub.doProcess(SEIStub.java:191) at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:108) at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:92) at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:161) at com.sun.proxy.$Proxy147.queryClientCompanyRightsIssues(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at weblogic.wsee.jaxws.spi.ClientInstanceInvocationHandler.invoke(ClientInstanceInvocationHandler.java:87) at com.sun.proxy.$Proxy145.queryClientCompanyRightsIssues(Unknown Source) at org.greenpole.services.clientcompany.rightsissue.RightsService.queryClientCompanyRightsIssues(RightsService.java:164) at org.greenpole.controller.clientcompany.RightsIssueController.getClientCompanyRightsIssueList(RightsIssueController.java:134) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) at javax.servlet.http.HttpServlet.service(HttpServlet.java:844) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79) at weblogic.websocket.tyrus.TyrusServletFilter.doFilter(TyrusServletFilter.java:205) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:85) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79) at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79) at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.__run(WebAppServletContext.java:3402) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57) at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572) at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311) at weblogic.work.ExecuteThread.run(ExecuteThread.java:263) Number of locked synchronizers = 1 - java.util.concurrent.locks.ReentrantLock$NonfairSync@706cf33f I read somewhere that JAX-WS isn't thread safe. Am I implementing it wrong, in my case?