“Java heap space” error in eclipse (Windows 7)

Little background : I am currently working in a project based on Eclipse RCP.  In this project whenever i need to setup a new work-space or dependency of my project change i need to resolve the target.

During resolving the target i was getting the  “Java heap space error in eclipse" frequently : i have tried different solution from web but i it never worked. specially changing the JVM argument in the eclipse.ini file never worked for me.

Fist of all i did not know how to check  current JVM min and max heap size. after googling i have found this nice tool which come by-default with JDK .

JConsole : 
Using JConsole you can check the current minimum and maximum head size alocated in the JVM for a program or process:

Please check the below link for details
http://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html

Now i know how much heap size is allocated currently: so i need to increase the heap size.
For increasing the heap size i have done the following  :

Try setting a Windows System Environment variable called _JAVA_OPTIONS with the heap size you want. Java should be able to find it and act accordingly.

 setting windows  system  env variable _JAVA_OPTIONS as -Xms2048m -Xmx4096m -XX:MaxPermSize=1024m


works for me  :)