CODEWITHSUNDEEP
javalinuxjboss-4.2.x
AshX
AshX

Reputation: 31

What if a variable is declared more than one time in JAVA_OPTS in jboss 4 on linux

I have declared variable -Xmx 2 times in JAVA_OPTS in run.sh of JBoss server.
e.g. -Xmx512m at say line no 15
and -Xmx1024 at say line no 50

So which -Xmx will be actually used by server? And how to check it?

Environment :
Application Server : JBoss 4.2
OS : Linux

Upvotes: 1

Views: 230

Answers (1)

Aniket Thakur
Aniket Thakur

Reputation: 68905

It's shell script after all (run.sh). Most recent value is picked up. You can try it for yourself.

Create a file run.sh with following content

#!/bin/bash
JAVA_OPTS="Before"
JAVA_OPTS="After"
echo $JAVA_OPTS

and run it ./run.sh and you should get "After" in the console. Nothing JBoss specific.

So to answer your question -Xmx1024 will be picked up. And to answer your question so as to how to check you can use programs like jconsole to view your java process and check your maximum memory allocated (as you have provided in -Xmx option). You can also do something like ps -ax | grep java to see the Java process and the JAVA_OPTS it used.

Upvotes: 1

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