how should i configure jetty 7 pre3 seer jdbc source?

all things controlling underneath windows xp pro sp2/32-bit.

i have downloaded jetty 7 pre3 http://dist.codehaus.org/jetty/jetty-7.0.0-prereleases/jetty-7.0.0pre3/jetty-assembly-7.0.0pre3.zip>dist.codehaus.org.

i have extracted jetty c:\jetty-7.0.0pre3\ (so i have c:\jetty-7.0.0pre3\bin\ dirs)

i have put webapp c:\jetty-7.0.0pre3\webapps\

i have resource-ref web.xml:

<resource-ref>
  <description>dev datasource</description>
  <res-ref-name>jdbc/dev</res-ref-name>
  <res-type>javax.sql.datasource</res-type>
  <res-auth>container</res-auth>
</resource-ref>

and settlement jetty.xml:

<array id="plusconfig" type="java.lang.string">
  <item>org.mortbay.jetty.webapp.webinfconfiguration</item>
  <item>org.mortbay.jetty.plus.webapp.envconfiguration</item>
  <item>org.mortbay.jetty.plus.webapp.configuration</item>
  <item>org.mortbay.jetty.webapp.jettywebxmlconfiguration</item>
  <item>org.mortbay.jetty.webapp.taglibconfiguration</item>
</array>

<new id="dev" class="org.mortbay.jetty.plus.naming.resource">
  <arg>jdbc/dev</arg>
  <arg>
    <new class="oracle.jdbc.pool.oracleconnectionpooldatasource">
      <set name="user">username</set>
      <set name="url">jdbc:oracle:thin:@10.201.201.64:1521:dev</set>
      <set name="password">password</set>
    </new>
  </arg>
</new>

<call name="addlifecycle">
  <arg>
    <new class="org.mortbay.jetty.deployer.webappdeployer">
      <set name="contexts"><ref id="contexts"/></set>
      <set name="webappdir"><systemproperty name="jetty.home" default="."/>/webapps</set>
      <set name="parentloaderpriority">false</set>
         <set name="extract">true</set>
         <set name="allowduplicates">false</set>
      <set name="defaultsdescriptor"><systemproperty name="jetty.home" default="."/>/etc/webdefault.xml</set>
      <set name="configurationclasses"><ref id="plusconfig"/></set>
    </new>
  </arg>
</call>

i'm controlling java -doption=plus -jar start.jar c:\jetty-7.0.0pre3\ i'm removing following error:

2008-10-14 12:12:49.163::info:  logging stderr around org.mortbay.log.stderrlog
2008-10-14 12:12:49.413::warn:  config blunder during <new id="dev" class="org.mortbay.jetty.plus.naming.resource"><arg>jdbc/dev</arg><arg>
    <new class="oracle.jdbc.pool.oracleconnectionpooldatasource"><set name="user">username</set><set name="url">jdbc:oracle:thin:@10.201.201.64:1521:dev</set><set name="password">password</set></new>
  </arg></new>
2008-10-14 12:12:49.413::warn:  exception
java.lang.classnotfoundexception: org.mortbay.jetty.plus.naming.resource
        during java.net.urlclassloader$1.run(unknown source)
        during java.security.accesscontroller.doprivileged(native method)
        during java.net.urlclassloader.findclass(unknown source)
        during java.lang.classloader.loadclass(unknown source)
        during java.lang.classloader.loadclass(unknown source)
        during org.mortbay.util.loader.loadclass(loader.java:91)
        during org.mortbay.xml.xmlconfiguration.nodeclass(xmlconfiguration.java:224)
        during org.mortbay.xml.xmlconfiguration.newobj(xmlconfiguration.java:572)
        during org.mortbay.xml.xmlconfiguration.configure(xmlconfiguration.java:256)
        during org.mortbay.xml.xmlconfiguration.configure(xmlconfiguration.java:214)
        during org.mortbay.xml.xmlconfiguration.main(xmlconfiguration.java:971)
        during sun.reflect.nativemethodaccessorimpl.invoke0(native method)
        during sun.reflect.nativemethodaccessorimpl.invoke(unknown source)
        during sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)
        during java.lang.reflect.method.invoke(unknown source)
        during org.mortbay.start.main.invokemain(main.java:218)
        during org.mortbay.start.main.start(main.java:564)
        during org.mortbay.start.main.main(main.java:136)

c:\jetty-7.0.0pre3\lib\plus\jetty-plus-7.0.0pre3.jar classpath. same console:

c:\jetty-7.0.0pre3>set classpath
classpath=c:\program files\ibm\websphere mq\java\lib\providerutil.jar;c:\program
 files\ibm\websphere mq\java\lib\com.ibm.mqjms.jar;c:\program files\ibm\webspher
e mq\java\lib\ldap.jar;c:\program files\ibm\websphere mq\java\lib\jta.jar;c:\pro
gram files\ibm\websphere mq\java\lib\jndi.jar;c:\program files\ibm\websphere mq\
java\lib\jms.jar;c:\program files\ibm\websphere mq\java\lib\connector.jar;c:\pro
gram files\ibm\websphere mq\java\lib\fscontext.jar;c:\program files\ibm\webspher
e mq\java\lib\com.ibm.mq.jar;.;c:\program files\java\jdk1.5.0_05\classes;c:\prog
ram files\java\jre1.5.0_05\lib\ext\qtjava.zip;c:\program files\java\jre1.5.0_05\
lib\spring.jar;c:\jetty-7.0.0pre3\lib\plus\jetty-plus-7.0.0pre3.jar

what's wrong? should i supplement org.mortbay.jetty.plus.naming.resource prominence area start.jar?