One of the administrative tasks that you perform during the development of Java external stored procedures is archive (JAR or ZIP) file registration and distribution, as discussed in Registering the JAR or ZIP File.
If the Java source code that implements an external stored procedure changes, you must perform another administrative task: archive file replacement. To replace a previously registered archive file, use the SQLJ.REPLACE_JAR external stored procedure. For details on using SQLJ.REPLACE_JAR to replace an archive file, see Replacing Registered JAR or ZIP Files.
For information on other administrative tasks that you perform during the development or maintenance of Java external stored procedures, see Administration.