Can't move a node from one state tree to another

Hans173 · October 10, 2019, 3:36pm

Here and there this exception occurs and i have no idea why. any suggestions?

Regards
Hans

2019-10-10 17:24:40,545 ERROR 8590 595 [https-jsse-nio-6060-exec-3]
      o.a.c.c.C.[.[.[.[springServlet]
 - Servlet.service() for servlet [springServlet]
 in context with path [] threw exception [com.vaadin.flow.server.ServiceException: java.lang.IllegalStateException: Can't move a node from one state tree to another. If this is intentional, first remove the node from its current state tree by calling removeFromTree]
 with root cause
java.lang.IllegalStateException: Can't move a node from one state tree to another. If this is intentional, first remove the node from its current state tree by calling removeFromTree
        at com.vaadin.flow.internal.StateNode.doSetTree(StateNode.java:678) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.StateNode.lambda$setTree$3(StateNode.java:364) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.StateNode.visitNodeTree(StateNode.java:637) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.StateNode.setTree(StateNode.java:364) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.StateNode.setParent(StateNode.java:264) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.nodefeature.NodeFeature.attachPotentialChild(NodeFeature.java:78) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.nodefeature.StateNodeNodeList.add(StateNodeNodeList.java:53) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.internal.nodefeature.ElementChildrenList.add(ElementChildrenList.java:42) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.dom.impl.AbstractNodeStateProvider.insertChild(AbstractNodeStateProvider.java:102) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.dom.Node.insertChild(Node.java:250) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.dom.Node.appendChild(Node.java:141) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.component.HasComponents.add(HasComponents.java:53) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.component.UI.add(UI.java:961) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.component.notification.Notification.lambda$setOpened$63d2899d$1(Notification.java:434) ~[vaadin-notification-flow-2.0.0.jar!/:?]

        at com.vaadin.flow.internal.StateTree.lambda$runExecutionsBeforeClientResponse$1(StateTree.java:364) ~[flow-server-2.0.14.jar!/:2.0.14]

        at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_144]

        at com.vaadin.flow.internal.StateTree.runExecutionsBeforeClientResponse(StateTree.java:361) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.communication.UidlWriter.encodeChanges(UidlWriter.java:392) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.communication.UidlWriter.createUidl(UidlWriter.java:182) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.BootstrapHandler$BootstrapPageBuilder.getInitialUidl(BootstrapHandler.java:732) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.BootstrapHandler$BootstrapPageBuilder.setupDocumentHead(BootstrapHandler.java:715) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.BootstrapHandler$BootstrapPageBuilder.getBootstrapPage(BootstrapHandler.java:521) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.BootstrapHandler.synchronizedHandleRequest(BootstrapHandler.java:462) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1540) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:246) ~[flow-server-2.0.14.jar!/:2.0.14]

        at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:95) ~[vaadin-spring-12.0.6.jar!/:?]

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.keycloak.adapters.springsecurity.filter.KeycloakPreAuthActionsFilter.doFilter(KeycloakPreAuthActionsFilter.java:84) ~[keycloak-spring-security-adapter-3.2.1.Final.jar!/:3.2.1.Final]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:262) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:262) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.security.oauth2.client.filter.OAuth2ClientContextFilter.doFilter(OAuth2ClientContextFilter.java:60) ~[spring-security-oauth2-2.3.6.RELEASE.jar!/:?]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) ~[spring-boot-actuator-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:155) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.keycloak.adapters.springsecurity.filter.KeycloakPreAuthActionsFilter.doFilter(KeycloakPreAuthActionsFilter.java:84) ~[keycloak-spring-security-adapter-3.2.1.Final.jar!/:3.2.1.Final]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:74) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]

        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:117) ~[spring-boot-actuator-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]

        at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:106) ~[spring-boot-actuator-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar!/:5.1.7.RELEASE]

        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_144]

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_144]

        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.19.jar!/:9.0.19]

        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

Denis48 · October 11, 2019, 6:21am

Yes, I have a suggestion: you are using a wrong scope for a component.
The scope is either Singleton (or unspecified at all which the same as Singleton) or something wider than UIScope.
Such scope makes a component effectively singleton at least for the same session and it will be reused inside the app within the session but this is incorrect: as exception says Can't move a node from one state tree to another. (node represents a component/element, tree represents a page/UI).

Hans173 · October 14, 2019, 2:10pm

Hello Denis,

thank you for your quick answer.
I think i could figure out what the problem was. I used a singleton hash map to reuse notification objects.
I have one additional question. How can I identify UI instances? UI.getCurrent().getUIId() returns always 0 …

Regards
Hans

Denis48 · October 14, 2019, 2:16pm

getUIId() is the correct way to identify a UI instance.
Are you sure you have several UI instances ?

Hans173 · October 14, 2019, 2:34pm

Yes in different sessions.

Denis48 · October 14, 2019, 2:43pm

UI has unique id per session.
So two ui instances may have the same id if they are in different sessions.

Hans173 · October 14, 2019, 3:02pm

I am using the hash code of the UI instance for now but that’s not really a long term solution …

Hans173 · October 15, 2019, 8:43am

The push connection identifier is unique across the whole session?

VaadinSession.getCurrent().getPushId()

As far as i can see there is no session id in Vaadin and the underlying wrapped session object is null in my case …

Denis48 · October 15, 2019, 8:47am

yes,

 private final String pushId = UUID.randomUUID().toString();

Hans173 · October 15, 2019, 10:27am

Thank you very much!

Martin595 · October 17, 2019, 2:39am

Hans,

For what it’s worth, I seem to remember that you get that exception if you try to add the same component twice, i.e.

  layout.add(mycomp);
  ...
  layout.adf(mycomp);