Mule Runtime Engine 4.9.0 Release Notes
Mule runtime engine (Mule) is a lightweight integration engine that runs Mule applications and supports domains and policies.
This version of Mule provides important enhancements and fixes. Deploy all your new and existing applications to the latest version to benefit from the improvements.
February 2025
Patch 4.9.1
The February patch update 4.9.1 addresses a regression in the previous February patch update, 4.9.0, and includes the fixes in the patch.
Patch release version: 4.9.1
This patch update addresses the following Mule issues:
| Description | Issue |
|---|---|
|
W-17801971 |
For guidance with the patching process, see Apply Patch Updates.
February 6, 2025
What’s New
The 4.9.0 version of Mule runtime introduces the following enhancements:
Java adoption:
-
You can now run applications on Java 17 only.
-
This release supports auto minor upgrades for Java 17 apps between Mule 4.8 Edge and Mule 4.9 Edge, as well as from Mule 4.6 LTS to Mule 4.9 LTS.
-
Java 8 and 11 apps won’t be auto minor upgraded to Mule 4.9, so plan your upgrade path for apps that are running on Java 8 or 11 accordingly.
Feature Flagging Mechanism:
-
Mule 4.9 incorporates new feature flags. See Feature Flagging Mechanism for a detailed description of each feature flag and configuration instructions.
Runtime Manager agent:
-
This release of Mule runtime 4.9.0 includes Runtime Manager agent 2.6.7. See Runtime Manager Agent 2.6.7 Release Notes.
General improvements:
-
Mule 4.9 upgrades the subset of libraries from included third-party software. See Third-Party Software in Mule for a detailed description.
DataWeave Features
The 2.9.0 version of DataWeave introduces the following new features and enhancements:
Extended format support:
-
DataWeave introduces support for the Event Stream format. See Event Stream Format.
General improvements:
-
DataWeave incorporates new system properties. See DataWeave System Properties.
Fixed Issues
The release addresses the following Mule issues and incorporates all patch updates from the 4.8.0 Mule release through January 2025:
| Issue Resolution | ID |
|---|---|
Spring is upgraded to 6.2.0. |
W-16639197 |
The |
W-16494546 |
The |
W-16494569 |
The |
W-16541666 |
The |
W-16515101 |
The |
W-16594688 |
The |
W-16980865 |
The |
W-16944403 |
The |
W-16908778 |
The |
W-16881509 |
The |
W-16772392 |
The |
W-16778624 |
The |
W-15263392 |
The |
W-16514909 |
Compile target is now set to Java 17. |
W-16045353 |
An error message now indicates if a classloader fails to be created for a service. |
W-17244755 |
DataWeave 2.9.0 is bundled with the Mule 4.9.0 release. This release addresses the following DataWeave issues:
| Issue Resolution | ID |
|---|---|
Java module now honors Java bean accessor methods. |
W-17142345 |
Bundled Components
-
DataWeave version 2.9.0
-
Runtime Manager Agent plugin version 2.6.7
Upgrade
If you are upgrading to this version of Mule from an earlier Mule 4.x version, see Mule Upgrades and Patch Updates.
To ensure optimal performance with this version of Mule and avoid unexpected issues, update the following modules and extensions to their latest version at the time of this release:
| Module or Extension | Version |
|---|---|
APIkit for Mule 4 |
1.11.3 |
APIkit for OData |
2.3.0 |
APIkit for OData 4 |
1.5.2 |
APIkit for SOAP |
1.6.0 |
APIkit for GraphQL |
1.1.0 |
Spring module |
1.4 |
MUnit plugin |
3.4.0 |
Considerations for Mule Extension Developers
If you update the version of your parent pom.xml file to 1.4.0 or later when you build a Mule extension, ensure that the dependencies in your pom.xml file do not override dependencies defined in the parent pom.xml file, and declare only the dependencies you need. If you need to declare a dependency that is already declared in the parent pom.xml file, do not specify a version so it uses the version from the parent pom.xml file.