# Classpath

To simplify the process of setting up the `CLASSPATH` environment variable to run Derby and the tools, a new jar file, `derbyrun.jar`, has been added to the Derby distribution. Adding this jar file to your classpath has the effect of putting all the Derby jar files in your classpath.

For details on using the Derby jar files for deploying applications, see the sections on deploying Derby applications in the Derby Developer's Guide.

Parent topic: Environment setup and the Derby tools
Related concepts
Java 2 Platform, Standard Edition, Version 1.4