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Mule: receive exception message

I have a default catch exception in Mule, and I'm trying to access the exception message using the Mule expression: # [exception]

This does not work, and I assume that I am trying to access the wrong variable? I am trying to register it with the registrar, and also run a custom component that receives an exception message (as a string.)

Thanks,

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5 answers

You can do #[exception.causedBy] as

  <choice-exception-strategy> <catch-exception-strategy when="exception.causedBy(com.company.BusinessException)"> <!-- [1] --> <jms:outbound-endpoint queue="dead.letter"> <jms:transaction action="ALWAYS_JOIN" /> </jms:outbound-endpoint> </catch-exception-strategy> <rollback-exception-strategy when="exception.causedBy(com.company.NonBusinessException)"> <!-- [2] --> <logger level="ERROR" message="Payload failing: #[payload]"/> </rollback-exception-strategy> </choice-exception-strategy>

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In some cases, exception.cause may be null , so it is recommended that you use a conditional expression to display the message:

 [(exception.cause!=null)?(exception.cause.message):exception]

This will prevent the null pointer from being thrown .

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The best way to get an exception message (null safe):

#[exception.cause.?message or exception.cause]

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Hi, if you want to receive an exception message using MEL, you can also (in Catch's Exception Strategy) use the following expression.

 #[exception.cause.message]
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exception.cause can be null, so it can be handled as follows:

 #[exception.?cause.message or exception]
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