Compensation handler sample

Question

Hello.
I have two different scopes in sequence. Each scope invokes a web service - this works whithout problems.
In the second scope I will catch an Exception; this works fine, too. If the the exception is caught in the second scope I would like to compensate the first scope.
And here is my problem: The catch block in scope 2 catches the exception but the <compensate ..> could not call the compensationHandler of scope 1. Does someone know the reason why?
If you need my .bpel file here is it:
<process name="CompensationTest1"
targetNamespace="http://acm.org/samples"
suppressJoinFailure="yes"
xmlns:tns="http://acm.org/samples"
xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:bpelx="http://schemas.oracle.com/bpel/extension"
xmlns:ora="http://schemas.oracle.com/xpath/extension"
xmlns:nsxml0="http://ams.ws" xmlns:nsxml1="http://ams.ws/types"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/">
<partnerLinks>
<partnerLink name="client"
partnerLinkType="tns:CompensationTest1"
myRole="CompensationTest1Provider"
partnerRole="CompensationTest1Requester"/>
<partnerLink name="partnerLink"
partnerLinkType="nsxml0:ReservationEndpointLink"
partnerRole="ReservationEndpointProvider"/>
</partnerLinks>
<variables>
<variable name="input"
messageType="tns:CompensationTest1RequestMessage"/>
<variable name="output"
messageType="tns:CompensationTest1ResponseMessage"/>
<variable messageType="nsxml0:ReservationEndpoint_printFirstString"
name="inFirstString"/>
<variable messageType="nsxml0:ReservationEndpoint_printFirstStringResponse"
name="outFirstString"/>
<variable messageType="nsxml0:ReservationEndpoint_compensateFirstString"
name="inCompensateFirst"/>
<variable messageType="nsxml0:ReservationEndpoint_compensateFirstStringResponse"
name="outCompensateFirst"/>
<variable messageType="nsxml0:ReservationEndpoint_printSecondString"
name="inSecondString"/>
<variable messageType="nsxml0:ReservationEndpoint_printSecondStringResponse"
name="outSecondString"/>
<variable messageType="nsxml0:WebServiceException"
name="WebServiceException"/>
<variable messageType="nsxml0:ReservationEndpoint_compensateFirstString"
name="inCatchCompensateFirstStr"/>
<variable messageType="nsxml0:ReservationEndpoint_compensateFirstStringResponse"
name="outCatchCompensateFirstStr"/>
</variables>
<faultHandlers>
<catchAll>
  <compensate name="compensate-2" scope="scope-4"/>
</catchAll>
</faultHandlers>
<sequence name="main">
<receive name="receiveInput" partnerLink="client"
portType="tns:CompensationTest1"
operation="initiate"
variable="input"
createInstance="yes"/>
<scope name="scope-4">
  <compensationHandler>
   <invoke name="invoke-9" partnerLink="partnerLink"
   portType="nsxml0:ReservationEndpoint"
   operation="compensateFirstString"
   inputVariable="inCompensateFirst"
   outputVariable="outCompensateFirst"/>
  </compensationHandler>
  <sequence>
   <invoke name="invoke-1"
   partnerLink="partnerLink"
   portType="nsxml0:ReservationEndpoint"
   operation="printFirstString"
   inputVariable="inFirstString"
   outputVariable="outFirstString"/>
  </sequence>
</scope>
<scope name="scope-2">
  <faultHandlers>
   <catchAll>
    <compensate name="compensate-6" scope="scope-4"/>
   </catchAll>
  </faultHandlers>
  <sequence>
   <assign name="assign-3">
    <copy>
     <from variable="input" part="payload" query="/tns:CompensationTest1Request/tns:input"></from>
     <to variable="inSecondString" part="parameters" query="/nsxml1:printSecondString/int_1"/>
    </copy>
   </assign>
   <invoke name="invoke-2"
    partnerLink="partnerLink"
    portType="nsxml0:ReservationEndpoint"
    operation="printSecondString" inputVariable="inSecondString"
    outputVariable="outSecondString"/>
  </sequence>
</scope>
<invoke name="callbackClient" partnerLink="client"
portType="tns:CompensationTest1Callback" operation="onResult"
inputVariable="output"/>
</sequence>
</process>Thanks in advance for your help!
best regards

Answer 1

Thanks Ryan for helping. I agree with Ryan. The compensation can be initated by the parent scope, i would have a main scope and define two child scopes and don't catch the fault in scope-2, it will bubble automatically to the parent scope..so it will go to mainScope's faultHandler..inside the fault handler you can call the compansate activity for scope-4, like below, please let me know if this doesn't work:
<scope name="mainScope">
<faultHandlers>
<catchAll>
<compensate name="compensate-2" scope="scope-4"/>
</catchAll>
</faultHandlers>
<sequence name="main">
<receive name="receiveInput" partnerLink="client"
portType="tns:CompensationTest1"
operation="initiate"
variable="input"
createInstance="yes"/>
<scope name="scope-4">
<compensationHandler>
<invoke name="invoke-9" partnerLink="partnerLink"
portType="nsxml0:ReservationEndpoint"
operation="compensateFirstString"
inputVariable="inCompensateFirst"
outputVariable="outCompensateFirst"/>
</compensationHandler>
<sequence>
<invoke name="invoke-1"
partnerLink="partnerLink"
portType="nsxml0:ReservationEndpoint"
operation="printFirstString"
inputVariable="inFirstString"
outputVariable="outFirstString"/>
</sequence>
</scope>
<scope name="scope-2">
<sequence>
<assign name="assign-3">
<copy>
<from variable="input" part="payload" query="/tns:CompensationTest1Request/tns:input"></from>
<to variable="inSecondString" part="parameters" query="/nsxml1:printSecondString/int_1"/>
</copy>
</assign>
<invoke name="invoke-2"
partnerLink="partnerLink"
portType="nsxml0:ReservationEndpoint"
operation="printSecondString" inputVariable="inSecondString"
outputVariable="outSecondString"/>
</sequence>
</scope>
<invoke name="callbackClient" partnerLink="client"
portType="tns:CompensationTest1Callback" operation="onResult"
inputVariable="output"/>
</sequence>
</scope>
</process>