[SOLVED] Vaadin throws an exception in Tomcat log on page refresh

I had my Vaadin application deployed on Tomcat and it was working for me for about an hour. Then it stopped working for unknown reason. When refreshing the page I am getting only page background and in catalina logs exception stack trace appears.

2023-03-10 05:21:32.343 ERROR 124726 --- [nio-8080-exec-8] c.v.flow.router.InternalServerError : There was an exception while trying to navigate to ''

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:739) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.StateNode.lambda$setTree$3(StateNode.java:380) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.StateNode.visitNodeTree(StateNode.java:688) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.StateNode.setTree(StateNode.java:380) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.StateNode.setParent(StateNode.java:274) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.nodefeature.NodeFeature.attachPotentialChild(NodeFeature.java:80) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.nodefeature.StateNodeNodeList.add(StateNodeNodeList.java:55) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.internal.nodefeature.ElementChildrenList.add(ElementChildrenList.java:44) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.dom.impl.AbstractNodeStateProvider.insertChild(AbstractNodeStateProvider.java:104) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.dom.Node.insertChild(Node.java:386) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.dom.Node.appendChild(Node.java:163) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.dom.Node.appendChild(Node.java:147) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.JavaScriptBootstrapUI$JavaScriptUIInternalUpdater.updateRoot(JavaScriptBootstrapUI.java:427) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.UIInternals.showRouteTarget(UIInternals.java:769) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.handle(AbstractNavigationStateRenderer.java:231) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.JavaScriptNavigationStateRenderer.handle(JavaScriptNavigationStateRenderer.java:78) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.JavaScriptBootstrapUI.handleNavigation(JavaScriptBootstrapUI.java:322) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.JavaScriptBootstrapUI.renderViewForRoute(JavaScriptBootstrapUI.java:285) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.component.internal.JavaScriptBootstrapUI.connectClient(JavaScriptBootstrapUI.java:151) ~[flow-server-23.3.4.jar:23.3.4] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:577) ~[na:na] at com.vaadin.flow.server.communication.rpc.PublishedServerEventHandlerRpcHandler.invokeMethod(PublishedServerEventHandlerRpcHandler.java:222) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.rpc.PublishedServerEventHandlerRpcHandler.invokeMethod(PublishedServerEventHandlerRpcHandler.java:199) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.rpc.PublishedServerEventHandlerRpcHandler.invokeMethod(PublishedServerEventHandlerRpcHandler.java:149) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.rpc.PublishedServerEventHandlerRpcHandler.handleNode(PublishedServerEventHandlerRpcHandler.java:132) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler.handle(AbstractRpcInvocationHandler.java:75) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocationData(ServerRpcHandler.java:438) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$1(ServerRpcHandler.java:419) ~[flow-server-23.3.4.jar:23.3.4] at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na] at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:419) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:320) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:115) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1564) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:369) ~[flow-server-23.3.4.jar:23.3.4] at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106) ~[vaadin-spring-23.3.4.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:596) ~[servlet-api.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:661) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:425) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:330) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:294) ~[catalina.jar:9.0.72] at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:51) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.25.jar:5.3.25] at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.25.jar:5.3.25] at javax.servlet.http.HttpServlet.service(HttpServlet.java:528) ~[servlet-api.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.25.jar:5.3.25] at javax.servlet.http.HttpServlet.service(HttpServlet.java:596) ~[servlet-api.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-websocket.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.25.jar:5.3.25] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.25.jar:5.3.25] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.25.jar:5.3.25] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.25.jar:5.3.25] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:126) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:64) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:101) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.25.jar:5.3.25] at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:119) ~[spring-boot-2.7.8.jar:2.7.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.25.jar:5.3.25] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.25.jar:5.3.25] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[catalina.jar:9.0.72] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[catalina.jar:9.0.72] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[catalina.jar:9.0.72] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[catalina.jar:9.0.72] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492) ~[catalina.jar:9.0.72] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) ~[catalina.jar:9.0.72] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[catalina.jar:9.0.72] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:673) ~[catalina.jar:9.0.72] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[catalina.jar:9.0.72] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[catalina.jar:9.0.72] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-coyote.jar:9.0.72] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-coyote.jar:9.0.72] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) ~[tomcat-coyote.jar:9.0.72] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) ~[tomcat-coyote.jar:9.0.72] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-coyote.jar:9.0.72] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-util.jar:9.0.72] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-util.jar:9.0.72] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-util.jar:9.0.72] at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

As there is no reference to my code at all in the stack trace, I don't know where even to start looking. I did have this exception in the past, but after I placed @PreserveOnRefresh into my main layout it was gone. Now it is back and I have no idea what is causing it and how to fix it. Here is the code for my main layout:

@PageTitle("Энциклопедия")
@Route(value = "")
@PreserveOnRefresh
public class EncyclopediaMainLayout extends VerticalLayout {

   private final  HeaderLayout header;
   private final  TableLayout table;

   public EncyclopediaMainLayout(@Autowired HeaderLayout hdr, @Autowired TableLayout tbl) {
      this.header = hdr;
      this.table = tbl;
      add(header, table);
   }    
}

I do have a suspicion that it somehow related to more than a single session accessing this page, but I am not sure. Anyway web application shall allow multiple sessions. Also I am not moving any nodes in my code. Please do help me to find the fix for this problem.

I did check 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 and went through all my code:

I do not have any singleton or static components. The only statics I have there some integer and String constants and something like this:

private static final Logger LOG = LoggerFactory.getLogger(ReviewPanel.class);

or

private static final SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

I don't think those can cause such exception, but if it does, please do tell me and I will remove all statics.