sizeof java object

Question

How can we find out the size of a java object??

Example:

class Person{
    String name;  
    int age;  

    public Person(String n, int a){  
          


        

Answer 1

EhCache provides a SizeOf class that will try to use the Instrumentation agent and will fall back to a different approach if the agent is not loaded or cannot be loaded (details here).

Also see the agent from Heinz Kabutz.