java.lang.OutOfMemoryError!! What does this mean....

[Penumatsa, Sreesha]

Hi,
My name is Sireesha. While i was trying to run a jsp, i got an Error msg
which says..
Internal Servlet Error:

Root cause: 
java.lang.OutOfMemoryError

Is there any speacific reason that justifies this Error msg?
I would greately aprretiate if can get some help on this.
thanx,
-Sireesha.