Excelsior JET for Windows - Version 4.1 Excelsior JET is a complete solution for acceleration, protection and deployment of your Java(tm) applications.Excelsior JET Optimizer converts your application's classes and jars into highly optimized Intel x86 code and creates a native executable for Microsoft Windows or Linux platform.Excelsior JET Runtime is a complete Java Virtual Machine that works with both Java classes and the executables produced by the Optimizer. It implements the Java SE platform, versions 5.0 and 1.4.2.Excelsior JET Installation Toolkit facilitates rapid creation of complete installation packages for your optimized Java applications. Installation of the JRE on end-user machines is not required.Excelsior JET Optimizer and Runtime are certified Java Compatible on a number of Microsoft Windows and Linux (IA-32) platforms.