Mule ESB Error

Handling- Karthik Selvaraj

“ Faults/errors that occur within Mule

application is referred as ”EXCEPTIONS”

The Mule exceptions can be classified into 2 categories and they are SYSTEM Exceptions and MESSAGING Exceptions

What is an EXCEPTION in MULE terminology ?

System Exception Strategy

⊡The system exception strategy is invoked by Mule when an error/fault happens at SYSTEM LEVEL

⊡System exception strategy is NOT customisable in Mule

⊡Some scenarios in which System exception strategy is invoked is when the connection to a FTP SERVER FAILS or when there an error during MULE APPLICATION START and STOP

What is Mule’s system exception strategy ?

Messaging Exception Strategy

⊡The messaging exception strategy is invoked by Mule when an error/fault happens while processing a message

⊡When an exception happens during processing a message, the normal flow execution is stopped and the process is transferred to exception strategy

What is Mule’s messaging exception strategy ?

Messaging Exception Strategy

A Mule flow without any messaging exception strategy

Messaging Exception Strategy

A Mule flow with catch exception strategy

How does the messaging exception strategy work in this scenario when the

XSLT processing fails ?

Messaging Exception Strategy

□When an exception occurs in the XSLT transformation, the control is passed on to the error handling flow ( catch exception strategy ) and not to the File output endpoint

□An message configured in logger component is displayed and the input message is routed to File error endpoint configured in error handling flow

Messaging Exception Strategy

Exception Handling Flow

Mule Console

Messaging Exception Strategy

⊡Each flow can have only ONE exception strategy

⊡A choice exception strategy can have nested exception strategy within it

What are the characteristics of

messaging exception strategy ?

Messaging Exception Strategy

⊡The exception strategy can have any number of message processors within it

What are the characteristics of

messaging exception strategy ?⊡The message

processors inside a exception strategy should not throw exception as we can’t create a nested exception strategy

Messaging Exception Strategy

□Default exception strategy□Catch exception strategy □Rollback exception strategy□Choice exception strategy□Reference exception strategy□Custom exception strategy□Mapping exception strategy

What are the different types of messaging exception strategies available in Mule ?

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