Libraries provided by Derby

Library name	Use
Engine libraries You always need this library for embedded environments. For client/server environments, you only need this library on the server.
derby.jar	For embedded databases
Tools libraries For embedded environments, you need a library in the classpath to use a tool. For a client/server environment, you need a library on the client only.
derbytools.jar	Required for running all the Derby tools (such as ij, dblook, and import/export).
The Network Server libraries
derbynet.jar	Required to start the Derby Network Server.
The network client libraries
derbyclient.jar	Required to use the Derby network client driver.
The locale libraries
derbyLocale_es.jar derbyLocale_de_DE.jar derbyLocale_fr.jar derbyLocale_it.jar derbyLocale_ja_JP.jar derbyLocale_ko_KR.jar derbyLocale_pt_BR.jar derbyLocale_zh_CN.jar derbyLocale_zh_TW.jar	Required to provide translated messages for the indicated locales.