Subject: Re: Starting build-system work (Windows/Mac users please speak up)
To: Kartik Ohri <kartikohri13@gmail.com>
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Cc: pljava-dev@lists.postgresql.org
From: Chapman Flack <chap@anastigmatix.net>
Message-ID: <5ED10C6D.2020000@anastigmatix.net>
Date: Fri, 29 May 2020 09:21:49 -0400
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On 05/29/20 08:14, Chapman Flack wrote:
> It may take some study and iteration to figure out patterns to search for
> in that output that will be sensitive to the most useful messages. But
> just getting the output saved somewhere is a good start.

Honestly, looks like the vast majority are local refs exceeding capacity in
com.sun.management.internal.DiagnosticCommandImpl.getDiagnosticCommandInfo.

I think a whole sequence like this is one warning and its stack trace:

INFO:  WARNING: JNI local refs: %d, exceeds capacity: %d
INFO:  	at com.sun.management.internal.DiagnosticCommandImpl.getDiag...
INFO:  	at ...
...(22 more lines)...
INFO:  	at java.lang.management.ManagementFactory.getPlatformMBeanServer...
INFO:  	- locked <%#016x>
INFO:  (a java.lang.Class for java.lang.management.ManagementFactory)
INFO:  	at org.postgresql.pljava.internal.DualState.<clinit>...


I was scratching my head why DualState.<clinit> would be getting called
so many times (I was expecting *one*), but I think what happens is it
starts the PlatformMBeanServer off in its own thread and that just reuses
the whole stack trace it inherited at birth forever.

I am pretty sure if sequences of just that one pattern were filtered out,
the result would be way, way shorter and the messages remaining in it
would be interesting ones.

Regards,
-Chap