Reserving space for a heap object

Question

I was trying to increase the virtual memory and RAM size in my 32-bit cmd shell. But each time I am executing the program, I am getting the below exception:

Error occurred during initialization of VM

Could not reserve enough space for object heap

Could not create the Java virtual machine

Please help me out in eliminating this exception.

Answer 1

I too encountered this problem and tried resolving it through the command line. But it seems like it doesn’t understand the cmd line options:

-bash-3.2$ javac -Xmx256M HelloWorldApp.java 
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

I think here you will have to set the _JAVA_OPTIONS. You can do this by following the below code:

-bash-3.2$ export _JAVA_OPTIONS="-Xmx256M"
-bash-3.2$ javac HelloWorldApp.java 
Picked up _JAVA_OPTIONS: -Xmx256M

Answer 2

Run the JVM with -XX:MaxHeapSize=512m (or any big number as you need) (or -Xmx512m for short)

This should resolve it!