Calling java code from Apache Derby - sql

Question

I've written a simple method in Java:
package com.fidel.extensions;
public class Extensions {
public static String capitalize(String input) {
return input.toUpperCase();
}
}
I then registered it as a function in Apache Derby.
create function capitalize(inputString varchar(255))
returns varchar(255)
parameter style JAVA
no sql language JAVA
external name 'com.fidel.extensions.Extensions.capitalize'
In order to give the database access to that code, this page suggests I have two choices:
Install the jar into the database
Add the jar to CLASSPATH
This is the text from that article:
The compiled Java for a procedure (or function) may be stored in the
database using the standard SQL procedure SQLJ.INSTALL_JAR or may be
stored outside the database in the class path of the application.
If I use the INSTALL_JAR approach to embed the jar into the database, my queries work fine. For example:
select capitalize('hello') from SYSIBM.SYSDUMMY1
However I don't actually want to store the jar in the database. I would like derby to look in my CLASSPATH variable to find it.
So I've added it to my CLASSPATH using the following:
export CLASSPATH=${CLASSPATH}:/home/fidel/dev/DbExtensions/extensions.jar
But when I run the same query, I get this error message:
The class 'com.fidel.extensions.Extensions' does not exist or is
inaccessible.
I'm using Netbean's SQL editor, which I assume would pick up the CLASSPATH I've set.
Has anyone managed to reference code in an external jar, via the CLASSPATH?
ps. I know I can use the UCASE/UPPER methods. But the code above is just an example
pps. I am able to get the query to work by adding the jar to the Driver list, but I don't think that's the correct thing to do.
Services -> Drivers -> Java DB (Embedded) -> Customize -> Add