What is Mule 4?
Mule 4 is the latest and most advanced version of the Mule Runtime Engine, the core component of the MuleSoft Anypoint Platform. Mule 4 is designed to simplify and speed up the development and management of integration solutions combining data and application integration across legacy systems, SaaS applications, and APIs.
Key Features in Mule 4 Migration
Mule Message
- Mule 4’s simplified message model ensures a cohesive and standardized approach to handling data across connectors.
- Mule 4’s use of attributes, replacing inbound properties, provides MuleSoft architects with a strongly typed approach for better data visibility.
- Variables (vars) empower API developers to manage user-specific information efficiently.
- Individual DataWeave expressions for headers and query parameters reduce complexities, offering more control over HTTP requests and event source responses without disrupting the primary flow.
DataWeave Expression Language
- DataWeave Expression Language streamlines data processing by handling data streaming transparently.
- DataWeave Expression Language in Mule 4 simplifies data access throughout Mule flows by eliminating the need to convert binary data into Java objects.
- DataWeave improves performance by enabling you to query binary data from expressions anywhere in your flow.
- Mule 4 DataWeave uses a simple syntax that is easy to learn and use.
Core Connectors and Modules
- Mule 4 replaces transports with connectors for improved consistency and usability.
- Mule 4 connectors have independent release cycles for faster innovation and versioning flexibility.
Error Handling
- Try Scope in Mule 4 empowers MuleSoft admins and API experts to handle errors within specific flow portions, enhancing error containment.
- It enhances the expressiveness of traits by converting them into functions.
- DataWeave improves XML processing by setting the default nullValueOn property of the reader to “empty”.
- DataWeave 2 expands its capabilities with typing for reusable functions, multi-line comments, Java code integration, and support for multipart, URL-encoded, and text readers and writers.
DataWeave 2.0
- DataWeave 2 introduces a function-based syntax for operators, improving clarity and simplifying learning.
- Enhanced Error Handling Granularity facilitates targeted error-handling strategies, addressing specific errors.
- Error Handlers in Mule 4 enable efficient error routing to matching handlers, streamlining error management and preventing errors from cascading through the application.
- Mule 4’s Error Mapping capability allows for customized error handling, enabling admins and experts to route errors to designated error handlers based on specific criteria.
Studio 7
- Simplified connector and module management for a more focused development environment.
- Does not support Mule 3 Applications.
- Automated Maven integration for seamless dependency management.
- Quick navigation to XML view for enhanced code visibility.
- Streamlined Platform account management for efficient project switching.
Runtime Engine
- Reactive, non-blocking architecture enhances performance and avoids processing bottlenecks.
- Streamlined execution engine simplifies development and scaling.
- Simplified concurrency management with maxConcurrency attribute.
- Optimized thread pool management for efficient resource utilization.
When to Conduct a Mule 4 Migration?
There are several reasons to consider upgrading to the newest version of Mule. Some of them are:
The Mule version you are using reaches End-of-Support.
Making updates to the existing applications.
Take advantage of crucial Mule 4 capabilities.
Upgrade all your apps to Mule 4 in one version.
Why Migrate to Mule 4?
Running applications and data on unsupported versions can slow down the delivery for your business, and managing multiple versions of the runtime is painful. While the effects of ignoring the end-of-support may seem less daunting than migrating, it is an excellent opportunity to transform your applications and infrastructure, take advantage of the features and improvements introduced in the most recent versions of Mule, and benefit from:
- Decreased complexity
- Optimized cost
- New connectors that would only run on Mule 4. x runtime
- Faster and more efficient development cycles
- Accelerated speed-to-value
- Improved productivity & performance
The Mule 3 to Mule 4 Migration Steps
| Discovery | Migration | QA | Live |
|---|---|---|---|
| Assessment | Platform Setup | Functional Testing | 24x7 Support |
| Code Analysis | Automated Migration | Performance Testing | |
| Migration Strategy | Manual Migration | Regression Testing |
How do we Upgrade to Mule 4 without Disruption?
- Involve experts to leverage advanced capabilities.
- Plan carefully and allocate time and resources.
- Migration of many APIs might take months at a high cost, so plan the upgrade well.
- Take an iterative approach, running both Mule versions in parallel.
What is Part of the Free MuleSoft Upgrade Assessment?
- Identify how long it will take to do the version upgrade.
- Calculate the scope of migration for on-premise instances using the Runtime Manager.
- Assess the compatibility with Runtime Engine.
- Evaluate the target Mule Version for the new application.
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