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I am running a java app on a Windows 10 machine via 

JAVA -Xms1500M -Xmx1600M -jar appname.jar

The app fails after a while with an error stating not enough heap space. When it is running using Task Manager I can see I am using about 50% of the total memory available on the machine.

If I try and increase the -Xmx space then I get an error saying it cannot be allocated - why is this as there is plenty of memory free?

The Java app is a 3rd party and I know it runs on colleagues pcs

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My JVM version is

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  • How much RAM do you have? Are you running a 32 bit JVM? What does java -version print out. Commented Dec 7, 2019 at 15:00
  • I am on a 64bit machine with 12Gb memory Commented Dec 7, 2019 at 15:02
  • Java version info has been added to the question Commented Dec 7, 2019 at 15:02
  • With 32 bit you'd have a 4GB limit Commented Dec 7, 2019 at 15:22
  • @gurioso - In practice, on Windows it is about 1.6GB. See the link in my answer. Commented Dec 7, 2019 at 15:32

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I suspect that you are running a 32 bit JVM. (According to the version info you have an Oracle release, and Java 8 was the last versin that Oracle provided 32 bit downloadables for.)

Assuming that is the case, the max heap size for a 32 bit Java on Windows is limited to between 1.4 and 1.6GB. The limit is a result of the way that Windows allocates virtual address spaces. For more details read:

The solution is to download and install a 64 bit Java release for Windows. You want a download for the "x86-64" architecture.

(I notice that you are running 1.8.0_101. That was released in July 2016 and is way out of date. At time of writing, the most recent Java 8 release is 1.8.0_231.)

The Java app is a 3rd party and I know it runs on colleagues pcs

They probably have installed 64 bit Java.

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Thanks - that was the issue I was running a 32 bit version. Removed it and added 64 bit version. It works fine now.
I used this to find the version I was running stackoverflow.com/questions/8825244/…

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