Unable to set JVM parameters/arguments (Xmx and Xms) through .bat file

Question

I am able to run a Java program through Eclipse by setting the VM arguments as -Xmx1024m -Xms256M. Now I want to run the same Java program (jar) through a .bat file in Windows. I am setting the JVM values in the file as follows

@echo off
set JAVA_OPTS="-Xmx1024m -Xms256m -XX:+HeapDumpOnOutOfMemoryError"
java -cp TA.jar com.myClass

But when I run the same program through batch (.bat in Windows XP) it throws Out of Memory error and I suspect that the JVM setting through the .bat file is not working.

Have you tried simply passing the options instead of setting the environment variable? — Michael Myers, Jan 31 '13 at 19:56
@Michael Myers I didnt quite understand what you meant.. sorry.. — IS_EV, Jan 31 '13 at 20:03
I mean `java -Xmx1024m -Xms256m -XX:+HeapDumpOnOutOfMemoryError -cp TA.jar com.myClass` instead of messing with JAVA_OPTS — Michael Myers, Jan 31 '13 at 20:04
possible dupe? http://stackoverflow.com/questions/2011311/running-java-with-java-opts-env-variable — sharakan, Jan 31 '13 at 20:06
@MichaelMyers: When I tried that it is showing the error - Could not find or load main class Xmx1024m — IS_EV, Jan 31 '13 at 20:12
@Bohemian - you shouldn't have deleted your answer. JAVA_OPTS is by no means used automatically by the JVM. — Perception, Jan 31 '13 at 20:12
@paulb: `java -cp TA.jar com.myClass -Xmx1024m -Xms256m -XX:+HeapDumpOnOutOfMemoryError` then? — Michael Myers, Jan 31 '13 at 20:18

score 11 · Answer 1 · answered Jan 31 '13 at 20:09

11

It should be _JAVA_OPTIONS instead of JAVA_OPTS.

answered Jan 31 '13 at 20:09

Danyel

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Thanks Danyel.. It worked.. I used : set _JAVA_OPTIONS=-Xmx1024m -Xms256m -XX:+HeapDumpOnOutOfMemoryError – IS_EV Jan 31 '13 at 20:17
this should be the real answer – sam-6174 Apr 08 '15 at 15:23

Caesar Ralf · Accepted Answer · 2013-01-31T20:24:36.520

3

Use the arguments directly

java -Xmx1024m -Xms256m -XX:+HeapDumpOnOutOfMemoryError -cp TA.jar com.myClass

You don't need to set them at JAVA_OPTIONS. To be sure that your application is using the parameters that you want:

open jvisualvm that comes with java. Just type "jvisualvm" at command line if you have set java correctly at your path.
open the vm started to your application.
check under "JVM Arguments" in the "Overview" tab.

There should be set your jvm options.

edited Jan 31 '13 at 20:24

answered Jan 31 '13 at 20:14

Caesar Ralf

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I have to pass some input paramentes as arguments from the command prompt. so in reality my bat file is java -cp TA.jar com.myClass %1 %2 . In this case where should I place the JVM paramters as per your approach. – IS_EV Jan 31 '13 at 20:21
you could set it before the -cp. Editing the answer. – Caesar Ralf Jan 31 '13 at 20:24

Unable to set JVM parameters/arguments (Xmx and Xms) through .bat file

2 Answers2