How do I set maximal jvm-memory (XMX) for a jar-file

How do I开发者_运维技巧 set the maximal jvm-memory without adding an extra batch-script to my Programm. Answer is provided below.

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It's a good question, but your implmenetation assumes a lot. I presume you have to document the name of your jar for your users to invoke "java -jar xyz.jar" on so can you also include in the documentation that "-Xmx256M" is required?

You may have more luck using a java launcher, such as this one for Windows, where you put the launcher config (path, max memory etc.) in a separate file. For cross platform, there's LaunchAnywhere, and others, which function similarly. See How can I convert my Java program to an .exe file?

To improve upon your existing scheme:

• use the java.home system property to resolve the location of the JDK/JRE
• use the java.class.path to set up the class path, and similarly for java.library.path if your application requires native code.
• pass command arguments passed to your main method to the spanwed process

But still, this seems to be a lot of effort that at best represents a leaky abstraction, when instead simple and clear documentation would suffice.