'increase the java heap size permanently?

Is there a way that I can set the default heap size for the jvm on my own computer? I want to set it to 1g, because I'm always running custom programs that always hit the overage point in the default jvm size.

I just dont want to have to remember to type -XmX1g everytime I run my java app from the command line...

There has to be an admin way to do this right?

javasizeheap-memoryjvm-arguments


Solution 1:[1]

Apparently, _JAVA_OPTIONS works on Linux, too:

$ export _JAVA_OPTIONS="-Xmx1g"
$ java -jar jconsole.jar &
Picked up _JAVA_OPTIONS: -Xmx1g

Solution 2:[2]

For Windows users, you can add a system environment variable named _JAVA_OPTIONS, and set the heap size values there. The JVM should be able to grab the virtual machine options from _JAVA_OPTIONS.

Solution 3:[3]

This worked for me:

export _JAVA_OPTIONS="-Xmx1g"

It's important that you have no spaces because for me it did not work. I would suggest just copying and pasting. Then I ran:

java -XshowSettings:vm

and it will tell you:

Picked up _JAVA_OPTIONS: -Xmx1g

Solution 4:[4]

what platform are you running?..
if its unix, maybe adding

alias java='java -Xmx1g'

to .bashrc (or similar) work

edit: Changing XmX to Xmx

Solution 5:[5]

if the platform is Linux, then adding an entry in bash_profile will help.

vim ~/.bash_profile

then add

export _JAVA_OPTIONS="-Xmx4g"

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 The Dissonant
Solution 3 DIF
Solution 4 Nam Vu
Solution 5 Syscall

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