Raise Error, On Error Propagate, and On Error Continue – Learn how to purposefully throw and catch errors using MuleSoft’s error handling scopes

Flow-Level vs. Global Error Handlers – Understand where to place error handlers and how their scope affects flow behavior

System Errors vs. Messaging Errors – Know which types of errors you can handle inside flows and which ones require external strategies

Mule Error Object – Use error.description and error.errorType to inspect, log, and route errors accurately

HTTP Listener Default vs. Custom Behavior – Discover what status codes and responses are returned by default and how to override them using vars.httpStatus

APIkit’s Auto-Generated Error Handling – See how APIkit creates flows and handlers from RAML, and how it uses variables to manage responses

Comparing On Error Continue and On Error Propagate – Master the difference in flow behavior, response codes, and processor execution

Mule Default Error Handler – Recognize when this fallback kicks in and how it mimics On Error Propagate behavior

Handler Type Matching & Stacking – Learn to define multiple error scopes and why their order (specific to general) determines which one is triggered

Parent vs. Child Flow Error Handling – Explore how errors propagate or are absorbed across flow references and what payload wins in the response

Sub Flows vs. Private Flows – Understand which can have their own error handling and which inherit from the caller

Processor-Level Try Scope – Isolate errors at the processor level for granular control without affecting the entire flow

Global Error Handlers – Configure and apply app-wide error handling when no local scope catches the error

Error Mapping – Replace verbose error types with meaningful custom identifiers for cleaner error handling

Mule Error Logic Flow – Follow Mule’s built-in decision tree to determine which handler will run and why

HTTP Status Overrides – Use variables to change response codes (like from 500 to 400) even inside On Error Propagate scopes

Exam Tips with Scenario Practice – Apply everything you've learned to real-world style exam questions with status codes, payloads, and error scope behavior

Summary Document:

https://docs.google.com/document/d/1V88KvyOfS2IvOy0A0wQ5COkY-9vOHq4dKBK8DvrIQo4/edit?tab=t.0#heading=h.tys6np99t07k