increasing java heap size

[durgaprasad ganji]

I am getting below exception when running my java class
java.lang.OutOfMemoryError: Java heap space

pls tell me how to increase JVM heap size for on windows platform

It would be great helpfull anybody send solution for this

[Deepak Bala]

Its very weird that your VM is out of space. Can you post some code ? and what does this have to do with SCJP ?

[Srinivasan thoyyeti]

Hi durga,
Could you please tell me snapshot of how many applications you are running ?
How much RAM you have?

1)Try to exit all remaining programs ...
2)You can checkout the free memory using Runtime Class.

[Yuriy Zilbergleyt]

Originally posted by Srinivasan thoyyeti:
Hi durga,
Could you please tell me snapshot of how many applications you are running ?
How much RAM you have?

1)Try to exit all remaining programs ...
2)You can checkout the free memory using Runtime Class.

I thought JVMs usually start up with a set amount of memory reserved, so as long as on JVM start up you have enough memory, opening a million other programs later on would not cause a Java out of memory error. Am I wrong?

Yuriy

[Jesper de Jong]

How you can set the heap size is described in the documentation. Use the -Xmx... option to set the maximum amount of memory that the JVM will allocate.

But really, instead of just setting the heap size larger, you should have a look at your code and find out why you are getting an OutOfMemoryError. Does your program really need to allocate so much memory or do you have a bug somewhere in your code?