how to connect the derby(java db) by netbean?

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I found many tutorial in the website:
http://db.apache.org/derby/papers/DerbyTut/ij_intro.html#ij_connect

http://db.apache.org/derby/papers/DerbyTut/embedded_intro.html


but it does not work at netbean,
the code can not compile, and netbean said there is no driver class...

public String driver = "org.apache.derby.jdbc.EmbeddedDriver"; ... Class.forName(driver).newInstance();


it there any tutorial teach how to use database in writing mobile programme?