Setting tomcat server in debug mode

To set up tomcat server in debug mode add the following line in the VM argument

Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n

In eclipse configuration you can add the Edit configuration window as shown below:

Setting Maximum Perm Size for JVM

Maximun Perm Memory is the memory where most of the classes and class loader reside. To adjust or increment the maximum perm gen size, just add the following line as VM arguments when starting server.

XX:MaxPermSize=256m

Where 256 is the memory MB, you can adjust this value as per your application requirement.