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:437)
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:402)
	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:513)
	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.Servlet30CometSupport.service(Servlet30CometSupport.java:66)
	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.JSR356Endpoint$1.onMessage(JSR356Endpoint.java:214)
	at org.atmosphere.container.JSR356Endpoint$1.onMessage(JSR356Endpoint.java:211)
	at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:395)
	at org.apache.tomcat.websocket.server.WsFrameServer.sendMessageText(WsFrameServer.java:119)
	at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:495)
	at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:294)
	at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:82)
	at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:171)
	at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:151)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:148)
	at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:54)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:53)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor117.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:158)
	... 38 more
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in com.uc4.ecc.ae.commons.content.uc4objectview.UC4ObjectView$2 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 com.vaadin.ui.Button$1.click(Button.java:54)
	... 42 more
Caused by: java.lang.RuntimeException: preSave was called but no postSave or saveDeclined happened (this can lead to workflow corruption!)
	at com.uc4.ecc.plugins.ae.perspectives.common.views.editor.gwe.WorkflowEditorContentController.preSave(WorkflowEditorContentController.java:529)
	at com.uc4.ecc.plugins.ae.perspectives.common.views.editor.WorkflowEditorViewController.preSave(WorkflowEditorViewController.java:634)
	at com.uc4.ecc.plugins.ae.perspectives.common.views.objectview.workflow.WorkflowSheet.preSave(WorkflowSheet.java:141)
	at com.uc4.ecc.ae.commons.content.uc4objectview.UC4ObjectPresenter.requestSave(UC4ObjectPresenter.java:734)
	at com.uc4.ecc.ae.commons.content.uc4objectview.UC4ObjectView$2.buttonClick(UC4ObjectView.java:266)
	at sun.reflect.GeneratedMethodAccessor85.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
	... 47 more