First Successful in Mule

First Successful in Mule

Here we are using choice flow control in mule 3 in Anypoint studio 6.2
First successful is one of the flow control components in Mule which iterates through message processors until one succeeds.
The First Successful message processor iterates through its list of child message processors, routing a received message to each of them in order until one processes the message successfully. If none succeed, an exception is thrown.
Defining success and failure:
  • If the child message processor throws an exception, this is a failure.
  • Otherwise:
    • If the child message processor returns a message that contains an exception payload, this is a failure.
    • If the child message processor returns a message that does not contain an exception payload, this is a success.
    • If the child message processor does not return a message (e.g. is a one-way connector), this is a success.
    • If the child message processor does not return a message (e.g. is a one-way connector), this is a success.
Here is the flow of First Successful scope

Basically here we are passing payload from postman by POST request.In flow Object to String converter converts payload from object form to string form and there are two Set payload components are connected with First Successful router. In first payload component that is payload123 its output is set to #[payload123] which produces error so control moves to second payload which is perfectly set to #[payload]. So, second Set payload component prints the given input message.

Payload123 component setting :

path : /first

url : http://localhost:8085/api/first
method : POST

Postman input & output :

XML project code :

<?xml version="1.0" encoding="UTF-8"?> <mule xmlns:db="" xmlns:http="" xmlns="" xmlns:doc="" xmlns:spring="" xmlns:xsi="" xsi:schemaLocation=""> <http:listener-config name="HTTP_Listener_Configuration" host="" port="8085" basePath="/api" doc:name="HTTP Listener Configuration"/> <flow name="testfirstsucessfulFlow"> <http:listener config-ref="HTTP_Listener_Configuration" path="/first" doc:name="HTTP"/> <object-to-string-transformer doc:name="Object to String"/> <first-successful doc:name="First Successful"> <set-payload value="#[payload123]" doc:name="payload123"/> <set-payload doc:name="Set Payload" value="#[payload]"/> </first-successful> </flow> </mule>

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