MuleSoft’s latest launch Mule 4, offers some exciting integration solutions...
Mule 3 to Mule 4 Cheat Sheet
Here’s the description of some action items that require analysis and migration:
- Configuration properties
Definition of loading of properties differs between mule versions.
- HTTP connectors
There are differences in the connector, especially when handling multipart projects.
- Replace MEL with DataWeave
MEL is no longer supported; DataWeave 2.0 is now the expression language.
- Refactor of transformers
Transformers (Ex. <object-to-string />, <object-to-json>) are no longer supported.
- DataWeave 1.0 to 2.0
Syntax and functions differ from 1.0 to 2.0; this requires analysis and translation.
- Object Store
It uses a new connector, which will require changes.
- Exception handling
Mule 4 uses a new system called Error Handlers.
- Message structure
Due to changes in the message structure, attachments, session properties, inbound, outbound, invocation properties are no longer supported.
- Poll component
In Mule 4, the <poll> element is replaced with the <scheduler> element.
- Java calls
Interoperability with Java is now done through the Java module.
- Spring beans
Instead of defining Spring beans directly in the application, one needs to use the Spring Module.
- Custom Aggregators
In scatter-gather, the java class definition is no longer needed and is replaced by DataWeave.
- Until-Successful component
Properties for configuring this component are changed between versions, requiring refactoring.
- Splitter/Aggregator
Splitters are no longer available in Mule 4. This needs to be refactored and replaced; aggregators have different behaviour.
- For Each Scope
In Mule 4, the transformation of the incoming collection to Java is unnecessary.
- Filters
Filters are no longer available; this needs to be replaced by the Validation Module.
- Enrichers
The message enricher is no longer available and required to be used within each component call using their target parameter.
- Policies
There are changes in the structure and has been packaged that requires refactoring.
- API kit
Changes to HTTP Listener, Auto discovery configuration, validation configuration is required.
- Other components that require migration
File Connector
Email Connector
AMQP Connector
FTP and SFTP Connector
Database Connector
Scripting Connector
Validation Connector
VM Connector
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