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Add default expressions for ExpEvalReqHAdvice (#2738)

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* Add default expressions for ExpEvalReqHAdvice

https://stackoverflow.com/questions/54546728/how-to-handle-ftpoutboundadapter-connection-exception-in-spring-integration-flow

When channels are configured for the `ExpressionEvaluatingRequestHandlerAdvice`,
but no expressions, the logic is not performed.
In other words: we can evaluate expressions, when no channels,
but we  don't send messages to channels when no expressions.

* Provide default expressions to be evaluated to `payload`, when only
channels are provided.

* * Remove asserts for expression setters
This commit is contained in:
Artem Bilan
2019-02-06 16:21:03 -05:00
committed by Gary Russell
parent e2d177e900
commit 71fd60fda6
4 changed files with 84 additions and 54 deletions
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src/reference/asciidoc/handler-advice.adoc
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@@ -406,6 +406,8 @@ An additional property, called `inputMessage`, contains the original message sen
A message sent to the `failureChannel` (when the handler throws an exception) is an `ErrorMessage` with a payload of `MessageHandlingExpressionEvaluatingAdviceException`.
Like all `MessagingException` instances, this payload has `failedMessage` and `cause` properties, as well as an additional property called `evaluationResult`, which contains the result of the expression evaluation.
NOTE: Starting with version 5.1.3, if channels are configured, but expressions are not provided, the default expression is used to evaluate to the `payload` of the message.
When an exception is thrown in the scope of the advice, by default, that exception is thrown to the caller after any `failureExpression` is evaluated.
If you wish to suppress throwing the exception, set the `trapException` property to `true`.
The following advice shows how to configure an advice with Java DSL: