Agrega un DataSource por JNDI a Jetty.

Jetty.xml

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">
<Configure id="Server" class="org.eclipse.jetty.server.Server">
  <New id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource">
    <Arg></Arg>
    <Arg>java:url/datasource</Arg>
    <Arg>
      <New class="oracle.jdbc.pool.OracleDataSource">
        <Set name="DriverType">thin</Set>
        <Set name="URL">jdbc:oracle:thin:@host:1521:name</Set>
        <Set name="User">user</Set>
        <Set name="Password">password</Set>
        <Set name="connectionCachingEnabled">true</Set>
        <Set name="connectionCacheProperties">
          <New class="java.util.Properties">
            <Call name="setProperty">
              <Arg>MinLimit</Arg>
              <Arg>5</Arg>
            </Call>
            <!-- put the other properties in here too -->
          </New>
        </Set>
      </New>
    </Arg>
  </New>
</Configure>