What is the Mule 4 event structure?
Suggested answer
In Mule 4, every message passed through a flow is a Mule Event. The Mule Event contains:
1. Message: Composed of: Payload — the main data being processed (e.g., JSON body, XML, file content). Attributes — metadata about the message source (e.g., HTTP request headers, query parameters, URI parameters, method, listener path). Attributes are set by the source connector and are read-only.
2. Variables: Flow-level variables set using set-variable or the Variables component. They persist throughout the same flow but not across async boundaries.
3. Error: When an error occurs, the Error object is available in error handlers containing error.description, error.errorType, error.cause. Unlike Mule 3, there is no separate outbound properties concept in Mule 4 — use target parameters or variables.
Practice content for interview preparation; not an official vendor answer. Verify details against current product documentation.
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