ConcurrentModificationException happening sometimes when running a simulation

[slarson]

The graphs keep evolving in time but the 3D scene is stuck

Running Chrome Version 36.0.1985.143 on Macbook Air

[jrmartin]

Issue also present in LEMS in same machine https://github.com/openworm/org.geppetto/issues/213

Unable to reproduce in any browser in Windows 7.

@mlolson @gidili When you get a chance, could you test this issue and/or 213 in your Mac machines? I am unable to reproduce any of these errors in my windows machine and wondering if other machines also get it.

[tarelli]

Updated the title as @mlolson has just seen it happening with the LEMS sample so it's not about SPH particularly.

[jrmartin]

@mlolson Can you tell me what steps lead to the exception ? Did you have two tabs open running geppetto?

[mlolson]

@jrmartin I had one tab open and I loaded the LEMS simulation. There was nothing in the logs about it, we might want to add some functionality to log exceptions.

[jrmartin]

@mlolson Thanks. One more, was it in your localhost or live.geppetto.org?

[mlolson]

localhost

[jrmartin]

There's a fix for it already, just waiting confirmation on the lack of error to consider it done.

[gidili]

@jrmartin out of curiosity how was this resolved?

[jrmartin]

@gidili I joined the SimulationThread in the SimulationService. What was happenning SimulationThread and SimulationVisitor were sometimes making calls to simulate() at the same time, joining Simulation Thread inside SimulationServcie waits for that thread to finish before moving on to SimulationVisitor.