[Wrapper-user] Wrapper and jvmstat: solution

[Hazelton, P. <PHa...@fn...>]

Hi

If you've seen the previous mails on this topic and want the solution,
I've worked out how to use these tools together. Here you go:

Once a "jvmstat enabled" JVM is started it writes a HotSpot "perfdata"
file to the temp directory of the user who started the JVM. The file's
name is the process id of the JVM. When you run the jvmps or one of the
other jvmstat instruments they seem to look for this file, in the temp
directory of the user running the jvmstat instrument. The temp directory
is determined by the TMP environment variable.

In my case jvmstat was looking for the in C:\Documents and
Settings\my_user\Local Settings\Temp. When I start the JVM normally the
"perfdata" is in the directory, but using Wrapper it goes to
C:\WINNT\Temp.

Thus, the problem is not that Wrapper is not starting the JVM in a
monitorable mode, but rather that the jvmstat tools just can't locate
the "perfdata" left by the JVM.

So, the simplest fix for this is changing the TMP environment variable
to point to C:\WINNT\Temp before starting the jvmstat tools.

Obviously with this information you could work out different, more
elegant, ways of solving the problem.

Cheers
Paul

my config:
Windows 2000 SP4
J2SDK 1.4.2_06
jvmstat 2.0_b11
Wrapper 3.1.2
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