SQLJ.INSTALL_JAR, SQLJ.REMOVE_JAR, and SQLJ.REPLACE_JAR are a set of procedures in the SQLJ schema that allow you to store jar files in a database.
Your jar file has two names:
A single schema can store more than one jar file.
For more information on when and how to use these procedures, see the section "Loading classes from a database" in the Derby Developer's Guide.