How to set maximum JVM memory size (-Xmx) in my Java code?

Question

I have a Java program which required -Xmx1g memory. I am using Netbeans IDE for application developing. I can set this parameter from the IDE,

Right click on the project --> select 'set configuration' --> select 'customize' --> set 'VM option' to -Xmx1g

After setting Xmx value, programe works without any error.

But when I try to run the .jar file from the command prompt, it gives me OutOfMemory error. So I want to set this value in my Java code (e.g.: somewhere in the main method) so I can run the .jar file from the command prompt.

How do I do that?

just use the command line parameters, thts all the configuration settings are doing in the background. — Jon Taylor
– Jon Taylor, Commented Aug 12, 2012 at 11:42
@JonTaylor can he call command line from java code and pass to it what ever ?! — shareef
– shareef, Commented Aug 12, 2012 at 11:43
no you add the parameters to the command which runs your jar file. — Jon Taylor
– Jon Taylor, Commented Aug 12, 2012 at 11:45
@shareef can you please tell me how to do this 'call command line from java code and pass to it' — Roshanck
– Roshanck, Commented Aug 12, 2012 at 11:47
@Jon what is the command line parameter? How do I use it in command line? — Roshanck
– Roshanck, Commented Aug 12, 2012 at 11:47

user1579810 · Accepted Answer · 2012-08-12 11:47:56Z

2

As far as i know, you can't do that in your java code as the jvm is already created when main get executed. But you still can use xmx switch from command line eg java -xmx1024m -jar (check the syntax, i did not).

answered Aug 12, 2012 at 11:47

user1579810

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San · Accepted Answer · 2015-08-20 22:06:15Z

0

Here's the actual syntax, and I have tested it too.

java -jar -Xmx1024m [jar_file] [args]

answered Aug 20, 2015 at 22:06

San

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