Friday 1 March 2024

How can you raise error explicitly in Mule flow/sub flow?95

 How can you raise error explicitly in Mule flow/sub flow?

There are two primary ways to raise errors explicitly in MuleSoft 4 flows and sub-flows:

1. Using the raise-error Component:

  • Drag and drop the raise-error component onto your desired location in the flow (either main flow or sub-flow).

  • Configure the component properties:

  • Error Type: Select the type of error you want to raise. Choose from pre-defined Mule error types or create your custom types.

  • Message: Specify the error message that will be logged and included in the exception payload.



<flow name="myFlow">
    <http:inbound-endpoint path="/my-endpoint" method="GET">
    <set-payload value="Invalid input data" />
    <raise-error error-type="CUSTOM:INVALID_INPUT" message="Input data is not valid" />

In this example, the flow raises a custom error of type CUSTOM:INVALID_INPUT with the specified message if the payload is set to "Invalid input data".

2. Throwing an Exception in a Script:

  • Within a script component (e.g., MEL or JavaScript), you can throw an exception using the appropriate syntax:

MEL Script:

Maya Embedded Language

    if (someCondition) {
        throw new Exception("Custom error message");

JavaScript Script:


if (someCondition) {
    throw new Error("Custom error message");


  • Both approaches offer explicit control over error handling.

  • Using the raise-error component provides a more visual and declarative way to define errors within the flow.

  • Throwing an exception within a script can be useful for conditional error handling based on script logic.

Choosing the Right Approach:

  • If you need to consistently raise errors at specific points in your flow or sub-flow with a clear message, the raise-error component is a good choice.

  • If you want to conditionally raise errors based on script logic within a script component, throwing an exception is appropriate.

Additional Considerations:

  • Remember to properly handle errors in your flow using on-error-continue or catch elements to ensure appropriate behavior when errors occur.

  • When throwing exceptions in scripts, ensure you use the correct exception type and provide informative error messages for better troubleshooting.

By effectively utilizing these approaches, you can effectively raise errors explicitly within your MuleSoft 4 flows and sub-flows, enabling robust error handling and exception management in your applications.

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