How to fix GC overhead limit exceeded in Eclipse

Eclipse will throw GC overhead limit exceeded error when it runs out of memory, normally while performing memory-consuming operations such as building workspace on big projects.

 An internal error occurred during: "Building workspace". GC overhead limit exceeded  

To fix this problem, you'll need to allocate more memory to your Eclipse instance. To do this, go to the Eclipse installation directory, and locate the eclipse.ini file.
To increase the memory allocation for your Eclipse instance, edit the number in the following lines accordingly.

 -Xms1024m   
 -Xmx2048m  

The number is the amount of memory, in Megabytes.
You can also increase the value of MaxPermSize, as the following:

 -XX:MaxPermSize=1024m  

Restart Eclipse for the changes to take effect.