Start Wildfly Build and deploy the ITOrders project Create a new case using the REST API: URL (POST): http://localhost:8080/kie-server/services/rest/server/containers/itorders_1.0.0-SNAPSHOT/cases/itorders.orderhardware/instances Body: { "case-data" : { }, "case-user-assignments" : { "owner" : "username", "manager" : "username", "supplier" : "username" } , "case-group-assignments" : {"supplier" : "IT" } } Use Postman to submit the following JSON using the REST API: URL (PUT): http://localhost:8080/kie-server/services/rest/server/containers/itorders_1.0.0-SNAPSHOT/tasks/1/states/completed?auto-progress=true Body: { "hwSpec_": { "org.jbpm.document.service.impl.DocumentImpl": { "identifier": "7f6e33aa-93ec-424c-ac75-f8be7fda", "name": "drools.png", "link": "", "size": 2729, "lastModified": { "java.util.Date": 1538165956000 } , "content": 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"attributes": { "_UPDATED_": "false" } } }, "supplierComment_":"Supplier comment" } Response: is 201 OK created Any document can be used by doing a base64 encoding will give the same result Now complete the next human task (Manager approval) using the REST API: URL (PUT): http://localhost:8080/kie-server/services/rest/server/containers/itorders_1.0.0-SNAPSHOT/tasks/2/states/completed?auto-progress=true Body: { "managerComment_": "Manager is happy with HW Spec", "approved_": true } If we send this over we get the error: 10:27:01,775 ERROR [org.kie.server.remote.rest.jbpm.UserTaskResource] (default task-30) Unexpected error during processing java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException: java.lang.RuntimeException: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException at org.jbpm.runtime.manager.impl.PerCaseRuntimeManager.disposeRuntimeEngine(PerCaseRuntimeManager.java:271) at org.jbpm.kie.services.impl.UserTaskServiceImpl.disposeRuntimeEngine(UserTaskServiceImpl.java:1179) at org.jbpm.kie.services.impl.UserTaskServiceImpl.completeAutoProgress(UserTaskServiceImpl.java:262) at org.kie.server.services.jbpm.UserTaskServiceBase.completeAutoProgress(UserTaskServiceBase.java:117) at org.kie.server.remote.rest.jbpm.UserTaskResource.complete(UserTaskResource.java:195) 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.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:406) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:213) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:228) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:65) at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53) at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59) at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1501) at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:330) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:137) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadKieSession(KnowledgeStoreServiceImpl.java:104) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadKieSession(KnowledgeStoreServiceImpl.java:36) at org.kie.internal.persistence.jpa.JPAKnowledgeService.loadStatefulKnowledgeSession(JPAKnowledgeService.java:144) at org.jbpm.runtime.manager.impl.factory.JPASessionFactory.findKieSessionById(JPASessionFactory.java:61) at org.jbpm.runtime.manager.impl.PerCaseRuntimeManager$PerCaseInitializer.initKieSession(PerCaseRuntimeManager.java:677) at org.jbpm.runtime.manager.impl.RuntimeEngineImpl.getKieSession(RuntimeEngineImpl.java:72) at org.jbpm.runtime.manager.impl.AbstractRuntimeManager.canDispose(AbstractRuntimeManager.java:197) at org.jbpm.runtime.manager.impl.PerCaseRuntimeManager.disposeRuntimeEngine(PerCaseRuntimeManager.java:247) ... 60 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:122) ... 68 more Caused by: java.lang.RuntimeException: Unable to load session snapshot at org.drools.persistence.api.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:104) at org.drools.persistence.PersistableRunner.initExistingKnowledgeSession(PersistableRunner.java:252) at org.drools.persistence.PersistableRunner.<init>(PersistableRunner.java:190) ... 73 more Caused by: java.lang.RuntimeException: Cannot read document from storage service at org.jbpm.document.marshalling.DocumentMarshallingStrategy.unmarshal(DocumentMarshallingStrategy.java:95) at org.jbpm.casemgmt.impl.marshalling.CaseFileInstanceMarshallingStrategy.unmarshal(CaseFileInstanceMarshallingStrategy.java:187) at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readFactHandle(ProtobufInputMarshaller.java:524) at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readFactHandles(ProtobufInputMarshaller.java:464) at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:252) at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:162) at org.drools.core.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:114) at org.drools.core.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:51) at org.drools.persistence.api.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:99) ... 75 more Caused by: java.lang.NullPointerException at org.jbpm.document.marshalling.DocumentMarshallingStrategy.unmarshal(DocumentMarshallingStrategy.java:91) ... 83 more At this point the kie server is locked and the only way to get anthing to work again is to kill (kill -9) the server since not even a Cntrl+C will stop the server. It appears that there is an issue with retrieving the document based on the stacktrace and error: RuntimeException: Cannot read document from storage service