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I have a java app that loads an enormous data set into memory (don't ask - it's messy). This app runs fine in the IntelliJ debugger but gives OOM (out of memory errors) when I try to run it as a compiled .jar file.

How would I find out the params that IntelliJ is using to run it? Looking at the process list didn't reveal anything promising.

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2 Answers 2

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You can simply do something like this:

java -jar -Xmx2048m myJar.jar

The xmx flag should allow you to add more memory for your jar to work with. You can just up this until it works.

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The first line in the Run toolwindow in IntelliJ IDEA shows the exact command line used to run the program, including all VM options.

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5 Comments

This sounds spot on but Im not seeing it. "menu" / "run" (or "debug") / ?
If you're using the "Debug" button to run your application, switch to the Console tab in the debugger.
Wow - pages and pages of .jar files - and not an Xmx or similar in sight. Go figure.
There won't be a -Xmx if you didn't specify it in the "VM options" field of your run configuration.
Which I didn't.. which is why this is a tad mysterious. Oh well.

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