Service invocation framework uses the same way of handling errors in Business Event System to manage errors if occur during the execution of business event subscriptions. If the service invocation returns a fault message, the event is enqueued to an error queue to trigger error processing. If an exception occurred during invocation process is due to service unavailability, the service faults should be logged and error subscription should be invoked.
To effectively process run-time exceptions for the events that are enqueued to an error queue, service invocation framework uses the following event ERROR process to specifically trigger error processing during the service invocation:
DEFAULT_EVENT_ERROR2: Default Event Error Process (One Retry Option)
Note: The DEFAULT_EVENT_ERROR2 Error workflow process is created under WFERROR itemtype.
For example, if there is a runtime exception when the Workflow Java Deferred Agent Listener executes event subscription to invoke a Web service, the event is enqueued to the WF_JAVA_ERROR queue. If the event has an Error subscription defined to launch the Error workflow process WFERROR:DEFAULT_EVENT_ERROR2, the Workflow Java Error Agent Listener executes the error subscription which sends a notification to SYSADMIN with Web service definition, error details, and event details. Since Oracle Workflow default event error handler provides options for SYSADMIN to retry the Web service invocation process after verifying that the reported error has been corrected, SYSADMIN can invoke the Web service again from the notification if necessary.
However, if there is a runtime exception when invoking the Web service by raising the Invoker event with synchronous subscription (phase <100), the exception thrown to the calling application. It is the responsibility of the calling application to manage the exception.
Enabling Error Processing During Service Invocation
To enable the error processing feature during the service invocation, you must create an Error subscription with the following values:
'Error' source type
'Launch Workflow' action type
'WFERROR:DEFAULT_EVENT_ERROR2' workflow process
To access the Create Event Subscription page, log in to Oracle E-Business Suite as a user who has the Workflow Administrator Web Applications responsibility. Select Business Events from the navigation menu and choose the Subscriptions subtab. In the Event Subscriptions page, click Create Subscription.
For detailed information on how to create an error subscription for service invocation, see Create an Error subscription with 'Launch Workflow' Action Type.