How to create an executable jar file with 1 GB heap

问题

I created a class that gives a text file containing system performance as output. I want to run it as an executable Jar. but when I run the Jar I want to increase the heap to 1 GB.

If we run this program I can do this by running like this:

java -Xms1200m  -Xmx1300m Sample

But how can I increase heap space using an executable Jar? When I click on the jar it must execute with a heap space of 1 GB.

回答1:

 java -Xms1200m -Xmx1300m -jar FILENAME.jar

Define this somewhere in the jar File or in the Manifest is not possible:

Can I set Java max heap size for running from a jar file?

回答2:

As already mentioned: it unfortunately is not possible (without creating a wrapper, whether shortcut/script/executable ...).

If you're only running on Windows, I can recommend Launch4J to create an executable wrapper that can apply these settings on execution:

Wrapping it in a executable has other benefits:

• If a suitable version of Java is not found, it will prompt the user to download it
• Windows 7 Start Menu will treat it properly (highlighting it as a new application after installation)
• Windows Firewall will treat it properly

来源：https://stackoverflow.com/questions/11879661/how-to-create-an-executable-jar-file-with-1-gb-heap