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[CDO/Net4J] InterruptedException during a lock [message #1781522]

Thu, 08 February 2018 03:14

Eclipse User

Hi,

In our application based on CDO 4.4, we have sometimes an InterruptedException during the lock of an object. We have not steps to reproduce. Have you some idea of what can cause this exception to help us to find a reliable steps to reproduce and finally fix the problem?

org.eclipse.net4j.util.WrappedException: java.lang.InterruptedException
at org.eclipse.net4j.util.WrappedException.wrap(WrappedException.java:54)
at org.eclipse.net4j.buffer.BufferInputStream.ensureBuffer(BufferInputStream.java:211)
at org.eclipse.net4j.buffer.BufferInputStream.read(BufferInputStream.java:130)
at org.eclipse.net4j.signal.SignalProtocol$SignalInputStream.read(SignalProtocol.java:655)
at java.io.DataInputStream.readBoolean(Unknown Source)
at org.eclipse.net4j.util.io.ExtendedDataInput$Delegating.readBoolean(ExtendedDataInput.java:67)
at org.eclipse.emf.cdo.internal.net4j.protocol.LockObjectsRequest.confirming(LockObjectsRequest.java:79)
at org.eclipse.emf.cdo.internal.net4j.protocol.LockObjectsRequest.confirming(LockObjectsRequest.java:1)
at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientRequest.confirming(CDOClientRequest.java:97)
at org.eclipse.net4j.signal.RequestWithConfirmation.doExtendedInput(RequestWithConfirmation.java:125)
at org.eclipse.net4j.signal.Signal.doInput(Signal.java:362)
at org.eclipse.net4j.signal.RequestWithConfirmation.doExecute(RequestWithConfirmation.java:105)
at org.eclipse.net4j.signal.SignalActor.execute(SignalActor.java:53)
at org.eclipse.net4j.signal.Signal.runSync(Signal.java:266)
at org.eclipse.net4j.signal.SignalProtocol.startSignal(SignalProtocol.java:469)
at org.eclipse.net4j.signal.RequestWithConfirmation.doSend(RequestWithConfirmation.java:89)
at org.eclipse.net4j.signal.RequestWithConfirmation.send(RequestWithConfirmation.java:75)
at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientProtocol.lockObjects2(CDOClientProtocol.java:284)
at org.eclipse.emf.internal.cdo.session.DelegatingSessionProtocol.lockObjects2(DelegatingSessionProtocol.java:705)
at org.eclipse.emf.internal.cdo.view.CDOViewImpl.lockObjects(CDOViewImpl.java:332)
at org.eclipse.emf.internal.cdo.view.CDOViewImpl.lockObjects(CDOViewImpl.java:296)
...
Caused by: java.lang.InterruptedException
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(Unknown Source)
at java.util.concurrent.locks.ReentrantLock.lockInterruptibly(Unknown Source)
at java.util.concurrent.LinkedBlockingQueue.poll(Unknown Source)
at org.eclipse.net4j.buffer.BufferInputStream.ensureBuffer(BufferInputStream.java:206)
... 98 more

Regards,

Laurent

Re: [CDO/Net4J] InterruptedException during a lock [message #1781545 is a reply to message #1781522]

Thu, 08 February 2018 06:13

Eclipse User

There's nothing that immediately rings a bell. I haven't heard of such a problem before. Something seems to interrupt your threads, but I know too little about your application to guess what that could be. You could try to set a breakpoint in Thread.interrupt() and see if that gives some clue. From a CDO/Net4j point of view I can only recommend to update to a newer version and see if the problem vanishes. But I have my doubts that CDO causes the interrupt, but there are two places where that method is called:

org.eclipse.net4j.util.concurrent.Worker.doActivate()
org.eclipse.net4j.util.concurrent.Worker.doDeactivate()

You could set breakpoints there, too.

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