[Solved] Warning from PhysicsSpace update on Desktop App

Troubleshooting physics
1

just switched my app to use Minie versus the older JBullet library. fixed references, built and ran. everything seems fine, but in the console log, i see this this warning repeated approximately 50 times per second:

Nov 18, 2024 10:40:22 AM com.jme3.bullet.PhysicsSpace update
WARNING: invoked from wrong thread

to help narrow this down, i added a call to dump the running threads into the console log as well:


[Thread[com.jme3.network.kernel.tcp.SocketConnector@35aa41b5,5,main], 
Thread[jME3 Audio Decoder,6,main], 
Thread[Finalizer,8,system], 
Thread[Physics Cleaner,5,main], 
Thread[DestroyJavaVM,5,main], 
Thread[com.jme3.network.kernel.tcp.SocketConnector@35aa41b5-writer,5,main],
Thread[AWT-Shutdown,5,system], 
Thread[Signal Dispatcher,9,system], 
Thread[Notification Thread,9,system], 
Thread[Java2D Disposer,10,system], 
Thread[AppKit Thread,5,system], 
Thread[jME3 Main,5,main], 
Thread[com.jme3.network.kernel.udp.UdpConnector@695e1534,5,main], 
Thread[Common-Cleaner,8,InnocuousThreadGroup],
Thread[com.jme3.network.kernel.udp.UdpConnector@695e1534-writer,5,main],
Thread[Reference Handler,10,system]]]

unsure which one could be the culprit, but if anyone else has come across this issue, it would be helpful. i did find a “similar” posting regarding Android, but this is a Desktop app running on MacOSX Big Sur (11.7.10).

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2

answering my own question, so that it can help others:

it seems that on a Mac (other OS too?) Desktop App, the physics layer WANTS to be set to parallel threading:

adding the following before attaching the BulletAppState got rid of the constant warnings:


bulletAppState.setThreadingType( BulletAppState.ThreadingType.PARALLEL );

HTH and cheers!

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3

That’s actually a defect in Minie.
I’m glad you found a workaround.

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