{ "error" : "Internal server error.", "error.Msg":"java.lang.NullPointerException
    at com.orientechnologies.orient.object.enhancement.OObjectEntitySerializer.serializeObject(OObjectEntitySerializer.java:143)
    at com.orientechnologies.orient.object.db.OObjectLazyList.add(OObjectLazyList.java:102)
    at com.orientechnologies.orient.object.db.OObjectLazyList.addAll(OObjectLazyList.java:228)
    at com.orientechnologies.orient.object.db.OObjectLazyList.<init>(OObjectLazyList.java:67)
    at com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler.manageCollectionSave(OObjectProxyMethodHandler.java:595)
    at com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler.setValue(OObjectProxyMethodHandler.java:802)
    at com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler.manageSetMethod(OObjectProxyMethodHandler.java:763)
    at com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler.invoke(OObjectProxyMethodHandler.java:113)
    at com.atcsibir.gxtinfoboxserver.server.models.queue.WaitingQueue_$$_javassist_14.setQueueNodes(WaitingQueue_$$_javassist_14.java)
    at com.atcsibir.gxtinfoboxserver.server.utils.QueueManager.registerForWaiting(QueueManager.java:491)
    at com.atcsibir.gxtinfoboxserver.server.utils.QueueManager.registerToQueue(QueueManager.java:579)
    at com.atcsibir.gxtinfoboxserver.server.utils.QueueManager$Proxy$_$$_WeldClientProxy.registerToQueue(Unknown Source)
    at com.atcsibir.gxtinfoboxserver.server.resttimeline.TimeLineManager.registerToQueueWithRest(TimeLineManager.java:191)
    at com.atcsibir.gxtinfoboxserver.server.resttimeline.TimeLineManager$Proxy$_$$_WeldClientProxy.registerToQueueWithRest(Unknown Source)
    at com.atcsibir.gxtinfoboxserver.server.servlets.RegInQueueProcessor.regInQueue(RegInQueueProcessor.java:303)
    at com.atcsibir.gxtinfoboxserver.server.servlets.RegInQueueProcessor.process(RegInQueueProcessor.java:171)
    at com.atcsibir.gxtinfoboxserver.server.servlets.RegInQueueProcessor$Proxy$_$$_WeldClientProxy.process(Unknown Source)
    at com.atcsibir.gxtinfoboxserver.server.servlets.RegInQueue.processRequest(RegInQueue.java:31)
    at com.atcsibir.gxtinfoboxserver.server.servlets.RegInQueue.doGet(RegInQueue.java:47)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.atcsibir.gxtinfoboxserver.server.filters.RegInQueueFilter.doFilter(RegInQueueFilter.java:54)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1083)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
" }