Java HotSpot Virtual Machine

hi all,

I am new to this forum and i need your help.

Question: I want my jvm to utilize all my cores as i have a quad core system.
I came across that jvm runs on single kernal thread thus other threads remains un utilized and
I also come across that if we fully utilize jvm efficiently then there is 1 to 1 mapping between jvm
threads and system threads but these both statements can not be true simultaneously so please help me.
So, please help me so that i can get out of this confusion and can run my application.

Thanks
neeti.