JavaDB ( derby ) path to database?

Using the embedded driver I can connect to my derby database using the JDBC url:

jdbc:derby:mydbname
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But, I usually put the full path for the db like:

jdbc:derby:/Users/oreyes/dbs/mydbname

Is there a way I can just specify the db name and have something like a "db_path" or something like that?

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I'm not an expert with derby, setting derby.system.home as described in developers guide seems to work as you expect.