Here is the error trace:
{"ToSubject":"org.jbpm.workbench.wi.workitems.service.ServiceTaskService:RPC","CommandType":"updateInstalledServiceTasks:java.lang.String:java.lang.String:","Qualifiers":

,"ReplyTo":"org.jbpm.workbench.wi.workitems.service.ServiceTaskService:RPC.updateInstalledServiceTasks:java.lang.String:java.lang.String::132:RespondTo:RPC","ErrorTo":"org.jbpm.workbench.wi.workitems.service.ServiceTaskService:RPC.updateInstalledServiceTasks:java.lang.String:java.lang.String::132:Errors:RPC","AdditionalDetails":"<tt><br\/>org.jboss.errai.bus.client.api.base.MessageDeliveryFailure: error invoking RPC endpoint public abstract void org.jbpm.workbench.wi.workitems.service.ServiceTaskService.updateInstalledServiceTasks(java.lang.String,java.lang.String)<br\/>    at org.jboss.errai.bus.server.io.AbstractRPCMethodCallback.invokeMethodFromMessage(AbstractRPCMethodCallback.java:75)<br\/>    at org.jboss.errai.bus.server.io.VoidRPCEndpointCallback.callback(VoidRPCEndpointCallback.java:36)<br\/>    at org.jboss.errai.bus.server.io.RemoteServiceCallback.callback(RemoteServiceCallback.java:54)<br\/>    at org.jboss.errai.cdi.server.CDIExtensionPoints$2.callback(CDIExtensionPoints.java:448)<br\/>    at org.jboss.errai.bus.server.DeliveryPlan.deliver(DeliveryPlan.java:47)<br\/>    at org.jboss.errai.bus.server.ServerMessageBusImpl.sendGlobal(ServerMessageBusImpl.java:297)<br\/>    at org.jboss.errai.bus.server.SimpleDispatcher.dispatchGlobal(SimpleDispatcher.java:46)<br\/>    at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:96)<br\/>    at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:113)<br\/>    at org.jboss.errai.bus.server.servlet.DefaultBlockingServlet.doPost(DefaultBlockingServlet.java:144)<br\/>    at javax.servlet.http.HttpServlet.service(HttpServlet.java:706)<br\/>    at javax.servlet.http.HttpServlet.service(HttpServlet.java:791)<br\/>    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)<br\/>    at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at org.uberfire.ext.security.server.SecureHeadersFilter.doFilter(SecureHeadersFilter.java:110)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at org.uberfire.ext.security.server.SecurityIntegrationFilter.doFilter(SecurityIntegrationFilter.java:70)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:55)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)<br\/>    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)<br\/>    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)<br\/>    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)<br\/>    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)<br\/>    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)<br\/>    at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53)<br\/>    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)<br\/>    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)<br\/>    at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)<br\/>    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)<br\/>    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)<br\/>    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)<br\/>    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)<br\/>    at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)<br\/>    at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)<br\/>    at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)<br\/>    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:360)<br\/>    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)<br\/>    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)<br\/>    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)<br\/>    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)<br\/>    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)<br\/>    at java.lang.Thread.run(Thread.java:748)<br\/>Caused by: java.lang.NullPointerException: <No Message><br\/>    at org.jbpm.process.workitem.repository.service.RepoData.updateInstalled(RepoData.java:249)<br\/>    at org.jbpm.process.workitem.repository.service.RepoService.updateInstalled(RepoService.java:396)<br\/>    at org.jbpm.workbench.wi.backend.server.workitem.ServiceTaskServiceImpl.updateInstalledServiceTasks(ServiceTaskServiceImpl.java:238)<br\/>    at org.jbpm.workbench.wi.backend.server.workitem.ServiceTaskServiceImpl$Proxy$_$$_WeldClientProxy.updateInstalledServiceTasks(Unknown Source)<br\/>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br\/>    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)<br\/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)<br\/>    at java.lang.reflect.Method.invoke(Method.java:498)<br\/>    at org.jboss.errai.bus.server.io.AbstractRPCMethodCallback.invokeMethodFromMessage(AbstractRPCMethodCallback.java:65)<br\/>    at org.jboss.errai.bus.server.io.VoidRPCEndpointCallback.callback(VoidRPCEndpointCallback.java:36)<br\/>    at org.jboss.errai.bus.server.io.RemoteServiceCallback.callback(RemoteServiceCallback.java:54)<br\/>    at org.jboss.errai.cdi.server.CDIExtensionPoints$2.callback(CDIExtensionPoints.java:448)<br\/>    at org.jboss.errai.bus.server.DeliveryPlan.deliver(DeliveryPlan.java:47)<br\/>    at org.jboss.errai.bus.server.ServerMessageBusImpl.sendGlobal(ServerMessageBusImpl.java:297)<br\/>    at org.jboss.errai.bus.server.SimpleDispatcher.dispatchGlobal(SimpleDispatcher.java:46)<br\/>    at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:96)<br\/>    at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:113)<br\/>    at org.jboss.errai.bus.server.servlet.DefaultBlockingServlet.doPost(DefaultBlockingServlet.java:144)<br\/>    at javax.servlet.http.HttpServlet.service(HttpServlet.java:706)<br\/>    at javax.servlet.http.HttpServlet.service(HttpServlet.java:791)<br\/>    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)<br\/>    at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at org.uberfire.ext.security.server.SecureHeadersFilter.doFilter(SecureHeadersFilter.java:110)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at org.uberfire.ext.security.server.SecurityIntegrationFilter.doFilter(SecurityIntegrationFilter.java:70)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:55)<br\/>    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)<br\/>    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)<br\/>    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)<br\/>    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)<br\/>    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)<br\/>    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)<br\/>    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)<br\/>    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)<br\/>    at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53)<br\/>    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)<br\/>    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)<br\/>    at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)<br\/>    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)<br\/>    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)<br\/>    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)<br\/>    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)<br\/>    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)<br\/>    at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)<br\/>    at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)<br\/>    at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)<br\/>    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)<br\/>    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:360)<br\/>    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)<br\/>    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)<br\/>    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)<br\/>    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)<br\/>    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)<br\/>    at java.lang.Thread.run(Thread.java:748)<br\/><\/tt>"} | Uncaught exception: null