if it is a JRE version issue then I should get issue with all the projects. But I am facing issue with one Project Only ?

can I know the steps how to install the MyCollab Update fix ?

below is the error logs from mycollab.out file. :

07:14:20,040 INFO c.m.w.DesktopApplication:313 - Get billing account successfully - Pricing: 0.0, User: nanda.kumar@smartstream-stp.com - Nanda Kumar
07:14:35,767 ERROR c.m.w.DesktopApplication:265 - Error
com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:162)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:119)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:435)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:407)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273)
at com.vaadin.server.communication.PushHandler$2.run(PushHandler.java:148)
at com.vaadin.server.communication.PushHandler.callWithUi(PushHandler.java:240)
at com.vaadin.server.communication.PushHandler.onMessage(PushHandler.java:494)
at com.vaadin.server.communication.PushAtmosphereHandler.onMessage(PushAtmosphereHandler.java:87)
at com.vaadin.server.communication.PushAtmosphereHandler.onRequest(PushAtmosphereHandler.java:77)
at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:199)
at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:107)
at org.atmosphere.container.Jetty9AsyncSupportWithWebSocket.service(Jetty9AsyncSupportWithWebSocket.java:180)
at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2075)
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:571)
at org.atmosphere.websocket.DefaultWebSocketProcessor$3.run(DefaultWebSocketProcessor.java:333)
at org.atmosphere.util.VoidExecutorService.execute(VoidExecutorService.java:101)
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:328)
at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:425)
at org.atmosphere.container.Jetty9WebSocketHandler.onWebSocketText(Jetty9WebSocketHandler.java:125)
at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:189)
at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:66)
at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:158)
at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:162)
at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:376)
at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:220)
at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:220)
at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:256)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:679)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:511)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.GeneratedMethodAccessor305.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:158)
... 39 common frames omitted
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in com.mycollab.module.project.view.ticket.TicketDashboardViewImpl$$Lambda$105/1791063734 failed.
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:533)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:200)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:163)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1015)
at com.vaadin.ui.Button.fireClick(Button.java:377)
at org.vaadin.viritin.button.MButton.fireClick(MButton.java:148)
at com.vaadin.ui.Button$1.click(Button.java:54)
... 43 common frames omitted
Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.TimSort.mergeLo(TimSort.java:777)
at java.util.TimSort.mergeAt(TimSort.java:514)
at java.util.TimSort.mergeCollapse(TimSort.java:441)
at java.util.TimSort.sort(TimSort.java:245)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.ArrayList.sort(ArrayList.java:1454)
at java.util.Collections.sort(Collections.java:175)
at com.mycollab.module.project.view.milestone.MilestoneComboBox.(MilestoneComboBox.java:56)
at com.mycollab.module.project.view.task.TaskEditFormFieldFactory.onCreateField(TaskEditFormFieldFactory.java:83)
at com.mycollab.vaadin.ui.AbstractBeanFieldGroupFieldFactory.setBean(AbstractBeanFieldGroupFieldFactory.java:116)
at com.mycollab.vaadin.ui.GenericBeanForm.setBean(GenericBeanForm.java:86)
at com.mycollab.module.project.view.task.TaskEditForm.setBean(TaskEditForm.java:63)
at com.mycollab.community.module.project.view.service.TicketComponentFactoryImpl$NewTicketWindow.doChange(TicketComponentFactoryImpl.java:228)
at com.mycollab.community.module.project.view.service.TicketComponentFactoryImpl$NewTicketWindow.(TicketComponentFactoryImpl.java:209)
at com.mycollab.community.module.project.view.service.TicketComponentFactoryImpl.createNewTicketWindow(TicketComponentFactoryImpl.java:164)
at com.mycollab.module.project.view.ticket.TicketDashboardViewImpl.lambda$new$98de2968$1(TicketDashboardViewImpl.java:172)
at sun.reflect.GeneratedMethodAccessor306.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
... 49 common frames omitted

when ever I click on the new ticket on particular project , then I get error msg as shown in below :

An unexpected error has occurred. We apologize for the inconvenience. Our team has been notified and will investigate the issue right away. To provide us with the best chance of fixing this problem, please select Yes to add the detail description that includes the steps required to reproduce the problem

Am still facing the same issue even if we use Java 1.8 version.

ok .. Let me restart the mycollab server after setup the java 1.8 version. and will update you .

[oracle~]$ java -version

java version "1.7.0_71"

Java(TM) SE Runtime Environment (build 1.7.0_71-b14)

Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)