Collecting foreign JMS metrics resulting in classnotfound (4313098)

The following errors are filling up the java agent logs

2011-02-22 19:13:57.209 WARN    [Periodic Discovery: WebLogic9] com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector - Unable to collect data for the MBean [com.bea:Name=StateNotificationTopicForeignDestination,Parent=[wliDomain]/JMSSystemResources[NA5530IntegrationJmsModule],Path=JMSResource[NA5530IntegrationJmsModule]/ForeignServers[NA5530ForeignServer]/ForeignDestinations[StateNotificationTopicForeignDestination],Type=weblogic.j2ee.descriptor.wl.ForeignDestinationBean] due to a temporary error condition; collection will be re-attempted at the next discovery interval
com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector$TemporarilyUnavailableMBeanException:
javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
 at com.sitraka.pas.agent.plugin.periodic.jmx.WebLogic9MetricsCollector$WebLogic9RootNode.createMBeanInstanceNode(WebLogic9MetricsCollector.java:499)
 at com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector$JmxRootNode.createMBeanNodes(AbstractJmxMetricsCollector.java:821)
 at com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector$JmxRootNode.checkCreateMBeanNodes(AbstractJmxMetricsCollector.java:727)
 at com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector$JmxRootNode.populate(AbstractJmxMetricsCollector.java:628)
 at com.sitraka.pas.agent.plugin.periodic.jmx.AbstractJmxMetricsCollector$JmxPeriodicNodeTree.discoverTreeChanges(AbstractJmxMetricsCollector.java:1378)
 at com.sitraka.pas.agent.periodic.PeriodicNodeTree.discovery(PeriodicNodeTree.java:463)
 at com.sitraka.pas.agent.periodic.PeriodicNodeTree.access$400(PeriodicNodeTree.java:38)
 at com.sitraka.pas.agent.periodic.PeriodicNodeTree$Dis