Excelsior JET is a Java VM implemented as a combination of three major components:
* Optimizing ahead-of-time (AOT) compiler
* Caching JIT compiler
* High performance runtime
Also included are numerous auxiliary tools and components that facilitate project setup (JET Control Panel), further application optimization (JetPerfect global optimizer, executable image optimizer), simplify deployment (JetPackII setup authoring tool, Excelsior Installer), and so on.