cannot rerun code more than once in colab

[murphyk]

If I call env = MultiAgentPyTAG(players, game_id="TicTacToe", obs_type="json") twice in a row in colab,
I get the error JVM cannot be restarted. This makes it impossible to try multiple experiments
without restarting colab (and reinstalling the code),

[martinballa]

Good catch! It was not hard to reproduce the error.

The issue is that when we call env.close() it makes a call to jpype.shutdownJVM() which shuts down the JVM and due to JPype's limitation it is impossible to restart it (https://jpype.readthedocs.io/en/latest/api.html#jpype.shutdownJVM).

You should be able to run experiments without calling env.close().

Let me know if you have any other questions!

[murphyk]

I see yoiv've already fixed this inthe colab - thanks

…

On Fri, Feb 28, 2025 at 11:57 PM Martin Balla ***@***.***> wrote: Good catch! It was not hard to reproduce the error. The issue is that when we call env.close() it makes a call to jpype.shutdownJVM() which shuts down the JVM and due to JPype's limitation it is impossible to restart it ( https://jpype.readthedocs.io/en/latest/api.html#jpype.shutdownJVM). You should be able to run experiments without calling env.close(). Let me know if you have any other questions! — Reply to this email directly, view it on GitHub <#9 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABDK6EFI73QQ2QM3RXXZZR32SFR5XAVCNFSM6AAAAABYDNBBRCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJSGA2TCMZQGU> . You are receiving this because you authored the thread.Message ID: ***@***.***> [image: martinballa]*martinballa* left a comment (martinballa/PyTAG#9) <#9 (comment)> Good catch! It was not hard to reproduce the error. The issue is that when we call env.close() it makes a call to jpype.shutdownJVM() which shuts down the JVM and due to JPype's limitation it is impossible to restart it ( https://jpype.readthedocs.io/en/latest/api.html#jpype.shutdownJVM). You should be able to run experiments without calling env.close(). Let me know if you have any other questions! — Reply to this email directly, view it on GitHub <#9 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABDK6EFI73QQ2QM3RXXZZR32SFR5XAVCNFSM6AAAAABYDNBBRCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJSGA2TCMZQGU> . You are receiving this because you authored the thread.Message ID: ***@***.***>