# Add the jar file or files to the database

Use a set of procedures to install, replace, and remove jar files in a database. When you install a jar file in a database, you give it a Derby jar name, which is an `SQL92Identifier`.

Note: Once a jar file has been installed, you cannot modify any of the individual classes or resources within the jar file. Instead, you must replace the entire jar file.

- Jar file examples

Parent topic: Class loading overview
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Related concepts
Dynamic changes to jar files or to the database jar classpath
Signed jar files