This document demonstrates how to create a synchronous service in Oracle BPEL PM that performs basic math operations of addition, subtraction and division. It shows how to implement individual scopes for each operation, add compensation handlers, and handle exceptions using catch blocks. The full process includes starting servers, creating the service, building out the BPEL process with assign, scope and compensate activities, configuring exception handling, deploying and testing the service.

1. Here we are going to demonstrate how to undo series of scopes that are successfully
executed
Start the adminserverandsoa server.
Checkthe status of serversbyloggingintoadminconsole(http://localhost:7001/console)
Create synchronousservice as shownbelow:
Nowgo and modifyyourxsdtocontaintwo inputelementsforrequestandthree elementsfor
response.
Your XSD will looklike below:

2. Nowgo to BPEL. Your BPEL shouldlooklike below:
Nowtake an assignactivityafterreceiveinputactivityandassigndefaultvalues
“0” to add_result
“-1” tosub_result
“Infinity”todiv_result

3. Your assignactivityshouldlooklikebelow:
Nowclickon apply.
Nowyour BPEL shouldlooklike below:

4. Nowadd three scope activitiesafterassignactivityandname themasscope_add,scope_suband
div_scope.
Nowyour BPEL shouldlooklike below:

5. Nowopenthe scope_addand dothe additionfunctionality.
Nowyour scope_addshouldlooklikebelow:
Nowadd a compensationhandlerbyclickingonthe symbol asshownbelow:

6. Nowyour scope_addwill looklike below:
Nowexpandthe compensationhandler,take anassignactivity,create a copyoperationandassign“0”
to
add_result.
Nowyour BPEL shouldlooklike below:

7. In the same way doit for Scope_subandthistime assign“-1” inthe compensationhandler’sassign
activity.Now
your scope_subwill looklike below:
Nowwe have to implementthe scope_divscope.

8. Expandthe scope_div scope andimplementthe same functionalityaswe have implementedfor
businessfaults:
Nowyour BPEL shouldlooklike below:
Nowgo to global scope andadd eithercatchblock/catch all block.
If you have addedcatch blockyouhave to configure the catch blockwiththe detailsasfollows:
http://soasolutions.com/devideBYZeroException
devideBYZeroException.
Nowyour global scope shouldlooklikebelow:

9. Nowtake a compensate activityintothe catchblockasshownbelow:
Nowdouble clickonthe compensate activityandchange the detailsasshownbelow:

10. Nowclickon applyandok
Nowtake a replyactivity,configure itwithoutputvariableandwire ittopartnerlink.
Nowyour final BPELshouldlooklike below:
Nowmake,deployandtestthe service.
BY SOASOLUTIONS