Jetty configuration problem

[Vincenzo Laudizio]

Hi,

I'm trying to configure the servicemix 4.4.2 embedded Jetty in order to 
register a Datasource as a JNDI Resource.
If I add the following statement:
        <New id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource">
             <Arg/>
             <Arg>jdbc/DSTest</Arg>
             <Arg>
                <New
   class="com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource">
                   <Set
   name="Url">jdbc:mysql://localhost:3306/sessions</Set>
                   <Set name="User">root</Set>
                   <Set name="Password">root</Set>
                </New>
              </Arg>
        </New>


in <ServiceMix_Home>/etc/jetty.xml file and i run servicemix, i get the 
following error:

   org.eclipse.jetty.util - 7.4.5.v20110725 | Config error at <New
   id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource"> ...

This is very odd since the same configuration works well on a standalone 
Jetty (version 7.4.5.v20110725).

Where am I wrong?

Vincenzo