Mulesoft -ERROR HANDLING 3.xx version

This post helps you to understand basic things in knowing about how Mulesoft handles Errors.

Mule's Default Exception Strategy is implicitly applied to all Mulesoft Applications (Exceptions thrown within Muleflows).If we want more sophisticated or customized forms of error management, we can implement one or more exception strategies.

1. System Exceptions : Mule invokes System Exception Strategy  when an exception is thrown at System level(i.e, when no message is involved) . For eg., During Application start-up or connection to external systems like Database, cloud connectors, Salesforce etc. fails.
   When exception occurs, Mule sends a notification to registered listeners/logs exception.
   If it is a connection failure, Reconnection Strategy is executed.
   System Exceptions are not configurable in Mule.
2. Messaging Exception: Mule invokes Messaging Exception Strategy when an exception is thrown within a flow.
   When exception is occurred within the flow , normal flow execution stops and process transfers to Message Processors within the exception Strategy.
   
   
   

Exception Strategy	Use	Transaction Error Handling
Default Exception Strategy	Defined and implicitly applied by default , to handle all messaging exceptions thrown in Mule Applications	When message throw an exception , the default Exception Strategy rolls back message and logs exception.
Catch Exception Strategy	Define a catch exception strategy to customize the way Mule handles any exception. It consumes inbound messages.	When message throws exception, catch Exception Strategy always commits the transaction and consumes message
Rollback Exception Strategy	It is defined to ensure that message that throw an exception in a flow is rolled back for reprocessing (only if message source supports redelivery) . Do not consume inbound message	It makes one or more attempts to rollback message and redeliver for processing. If it exceeds attempts, then Rollback consumes inbound message.
Reference Exception Strategy	Define a reference to refer to error handling defined in global/catch or choice exception .	Reference itself never commits, never rollback nor consume activity.
Choice Exception Strategy	Customize the way mule handles exceptions based on message’s content.	Choice Exception strategy itself never rollback/commits nor consumes.