Strange log error

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Anybody a guess what may cause this error?   Sep 4 11:39:11.056 - ERROR - Connector: (1/21) com.mendix.systemwideinterfaces.MendixRuntimeException: Long running microflow (15360539464311) failed due to an error. Sep 4 11:39:11.056 - ERROR - Connector: (2/21) #011at com.mendix.webui.actions.client.PollBackgroundJobAction.execute(PollBackgroundJobAction.scala:28) Sep 4 11:39:11.056 - ERROR - Connector: (3/21) #011at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply$mcV$sp(ClientRequestHandler.scala:312) Sep 4 11:39:11.056 - ERROR - Connector: (4/21) #011at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:302) Sep 4 11:39:11.056 - ERROR - Connector: (5/21) #011at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:302) Sep 4 11:39:11.056 - ERROR - Connector: (6/21) #011at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2$$anon$1.execute(ActionDispatching.scala:161) Sep 4 11:39:11.056 - ERROR - Connector: (7/21) #011at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) Sep 4 11:39:11.056 - ERROR - Connector: (8/21) #011at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2.apply(ActionDispatching.scala:163) Sep 4 11:39:11.056 - ERROR - Connector: (9/21) #011at scala.util.Try$.apply(Try.scala:192) Sep 4 11:39:11.056 - ERROR - Connector: (10/21) #011at com.mendix.core.session.Worker$$anonfun$receive$3.applyOrElse(ActionDispatching.scala:157) Sep 4 11:39:11.056 - ERROR - Connector: (11/21) #011at akka.actor.Actor$class.aroundReceive(Actor.scala:502) Sep 4 11:39:11.056 - ERROR - Connector: (12/21) #011at com.mendix.core.session.Worker.aroundReceive(ActionDispatching.scala:153) Sep 4 11:39:11.056 - ERROR - Connector: (13/21) #011at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526) Sep 4 11:39:11.056 - ERROR - Connector: (14/21) #011at akka.actor.ActorCell.invoke(ActorCell.scala:495) Sep 4 11:39:11.056 - ERROR - Connector: (15/21) #011at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) Sep 4 11:39:11.056 - ERROR - Connector: (16/21) #011at akka.dispatch.Mailbox.run(Mailbox.scala:224) Sep 4 11:39:11.056 - ERROR - Connector: (17/21) #011at akka.dispatch.Mailbox.exec(Mailbox.scala:234) Sep 4 11:39:11.056 - ERROR - Connector: (18/21) #011at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) Sep 4 11:39:11.056 - ERROR - Connector: (19/21) #011at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) Sep 4 11:39:11.056 - ERROR - Connector: (20/21) #011at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) Sep 4 11:39:11.056 - ERROR - Connector: (21/21) #011at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) It gives me no clue whatsover what the real issue is. Or am I missing something here? Regards, Ronald    
asked
3 answers
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Long running microflow (15360539464311)

Is this number an ID of the microflow that you can use to find failing microflow using MendixSDK?

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0

To me, this seems like a client error: the client is polling the server for the result of an action. The server tells the client the action has failed, and the client throws this error. You should look earlier in the log to see which action failed for which reason.

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Not sure if you found the cause of this error, but we've been getting it on our side inconsistently. The Error stack trace that accompanies the error points to a 

Caused by: com.mendix.languages.expressions.ExpressionException: java.lang.NullPointerException
Β Β  Β at com.mendix.languages.expressions.Expr.evaluate(Expr.java:34)
Caused by: java.lang.NullPointerException: null

Where an attribute that is required is null, which mendix does not accept. Mendix accepts "empty", but not null.

In our case this occurs when clicking a button that saves some data. The error would occur only sometimes. 

I'm not sure why this is happening, did you perhaps have success on your side?

answered