[jboss-jira] [JBoss JIRA] (DROOLS-1440) Insufficient synchronization in ObjectModelResolverProvider

Insufficient synchronization in ObjectModelResolverProvider ----------------------------------------------------------- Key: DROOLS-1440 URL: https://issues.jboss.org/browse/DROOLS-1440 Project: Drools Issue Type: Bug Components: kie server Affects Versions: 6.4.0.Final Environment: kie-server 6.4.0.Final-redhat-13 (BPMS 6.3.4) Reporter: Marek Schmidt Assignee: Maciej Swiderski Immediately after server startup with parallel clients, the following error appeared in the logs, suggesting insufficient synchronization in ObjectModelResolverProvider initialization: {noformat} 11:59:17,735 WARN [org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory] (http-10.1.3.249:8080-5) Unable to find ObjectModelResolver for mvel 11:59:17,736 ERROR [org.kie.server.remote.rest.jbpm.ProcessResource] (http-10.1.3.249:8080-5) Unexpected error during processing null: java.lang.NullPointerException at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getInstanceFromModel(DefaultRegisterableItemsFactory.java:213) at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getWorkItemHandlersFromDescriptor(DefaultRegisterableItemsFactory.java:260) at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getWorkItemHandlers(DefaultRegisterableItemsFactory.java:84) at org.jbpm.runtime.manager.impl.KModuleRegisterableItemsFactory.getWorkItemHandlers(KModuleRegisterableItemsFactory.java:98) at org.jbpm.runtime.manager.impl.AbstractRuntimeManager.registerItems(AbstractRuntimeManager.java:119) at org.jbpm.runtime.manager.impl.PerProcessInstanceRuntimeManager$PerProcessInstanceInitializer.initKieSession(PerProcessInstanceRuntimeManager.java:514) at org.jbpm.runtime.manager.impl.RuntimeEngineImpl.getKieSession(RuntimeEngineImpl.java:70) at org.jbpm.kie.services.impl.ProcessServiceImpl.signalProcessInstance(ProcessServiceImpl.java:173) at org.kie.server.services.jbpm.ProcessServiceBase.signalProcessInstance(ProcessServiceBase.java:153) at org.kie.server.remote.rest.jbpm.ProcessResource.signalProcessInstance(ProcessResource.java:185) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_121] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_121] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_121] at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_121] at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:583) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:565) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:130) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:832) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:620) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:553) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:482) at org.openshift.kieserver.web.redirect.RedirectFilter.doFilter(RedirectFilter.java:150) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.openshift.kieserver.web.security.SecurityFilter.doFilter(SecurityFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:656) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_121] 11:59:17,736 WARN [org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory] (http-10.1.3.249:8080-1) Unable to find ObjectModelResolver for mvel 11:59:17,738 ERROR [org.kie.server.remote.rest.jbpm.ProcessResource] (http-10.1.3.249:8080-1) Unexpected error during processing null: java.lang.NullPointerException at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getInstanceFromModel(DefaultRegisterableItemsFactory.java:213) at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getWorkItemHandlersFromDescriptor(DefaultRegisterableItemsFactory.java:260) at org.jbpm.runtime.manager.impl.DefaultRegisterableItemsFactory.getWorkItemHandlers(DefaultRegisterableItemsFactory.java:84) at org.jbpm.runtime.manager.impl.KModuleRegisterableItemsFactory.getWorkItemHandlers(KModuleRegisterableItemsFactory.java:98) at org.jbpm.runtime.manager.impl.AbstractRuntimeManager.registerItems(AbstractRuntimeManager.java:119) at org.jbpm.runtime.manager.impl.PerProcessInstanceRuntimeManager$PerProcessInstanceInitializer.initKieSession(PerProcessInstanceRuntimeManager.java:514) at org.jbpm.runtime.manager.impl.RuntimeEngineImpl.getKieSession(RuntimeEngineImpl.java:70) at org.jbpm.kie.services.impl.ProcessServiceImpl.signalProcessInstance(ProcessServiceImpl.java:173) at org.kie.server.services.jbpm.ProcessServiceBase.signalProcessInstance(ProcessServiceBase.java:153) at org.kie.server.remote.rest.jbpm.ProcessResource.signalProcessInstance(ProcessResource.java:185) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_121] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_121] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_121] at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_121] at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:583) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:565) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:130) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:832) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:620) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:553) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:482) at org.openshift.kieserver.web.redirect.RedirectFilter.doFilter(RedirectFilter.java:150) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.openshift.kieserver.web.security.SecurityFilter.doFilter(SecurityFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:656) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_121] {noformat} see https://github.com/droolsjbpm/jbpm/blob/6.4.x/jbpm-runtime-manager/src/ma... and https://github.com/droolsjbpm/droolsjbpm-knowledge/blob/6.4.x/kie-interna... (seems like resolvers could be an non-null empty array still for the second thread, as it would not go into the synchronized block... )