How to access the database jar file using the derby 10.2.1.6 database ?

Hi,
How to access the database jar file using the derby 10.2.1.6 database ?
I have used like below. And i am getting the following the error:
"org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'org.apache.derby.jdbc.EmbeddedDriver'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1136)"
My context.xml file looks like this:
<Context crossContext="true">
<Resource name="jdbc/derby" auth="Container"
type="javax.sql.DataSource" driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
url="jdbc:derby:jar(\CalypsoDemo\database.jar)samples"
username="xxx" password="xxx" maxActive="20" maxIdle="10"
maxWait="-1"/>
</Context>
What could be the reason.?
Any suggestions will be appriciated.
Thanks in Advance,
Gana.

ya, I have restarted. Can you please tell me whether the path which i am giving is right or not in the context file?
Thanks,
Gana.

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