I am not able to see any major GC is getting triggered in my application server. This is because, I have assigned more memory which is 4GB. And maximum it is going upto 1GB. I just want to see a Full GC to be happened. 

To triggered a Full GC , I need to full the heap memory which is not possible while my application is running. So, Planning to put some temporary object while starting the server and fill the Heap at lease 3.5GB. 

Can anybody help me out to give me some approach?

Thanks in advance