ClassCastException when using complex threshold expressions.

I have a situation that needs trigger a threshold when the value is equal to certain numbers. This is not the standard use case of thresholds but in this particular situation will be very useful.

I need to track JUNIPER-MIB::jnxOperatingState. Operating state is defined as on of the following by the MIB:

  1 - unknown
  2 - running
  3 - ready
  4 - reset
  5 - runningAtFullSpeed
  6 - down
  7 - standby

The threshold should be triggered when the value is running(2), ready(3) ot standby (7), so here is the threshold definition:

<group name="juniper-status" rrdRepository = "/opt/opennms/share/rrd/snmp/">
   <expression type="high" expression="jnxOperatingState == 2.0 || jnxOperatingState == 3.0 || jnxOperatingState == 7.0 ? 1.0 : 0.0"
      ds-type="jnxContentsContainerIndex" ds-label="jnxContentsType" value="1" rearm="0" trigger="1"
      triggeredUEI="org.opennms/thresholds/juniper/powerStatusFailure"
      rearmedUEI="org.opennms/thresholds/juniper/powerStatusNormal">
      <resource-filter field="jnxContentsType">^jnxPower$</resource-filter>
   </expression>
</group>

We use Apache JEXL to parse and evaluate the expressions, the above expression is correct according with:
http://commons.apache.org/jexl/reference/syntax.html#Operators

The problem is that ExpressionConfigWrapper will throw a ClassCastException because JEXL return a Long and that class will try to convert the value returned into Double.