The Irish twins gave wacky renditions of Ghostbusters,We Will Rock You and Oops, I Did It Again on The X Factor before being voted offthe talent show.
VisualVM is a tool that provides a visual interface for viewing detailed information about Java applications while they are running on a Java Virtual Machine (JVM).
A Java virtual machine (JVM) is an abstract computing machine that enables a computer to run a Java program. There are three notions of the JVM: specification, implementation, and instance. The specification is a document that formally describes what is required of a JVM implementation.