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Comprehensive Guide to MuleSoft Migration to Java 17.

Why MuleSoft Migration to Java 17?

MuleSoft will start following Java’s long-term support (LTS) release schedule beginning with Mule runtime 4.6, providing support for Java 17 LTS. The MuleSoft Migration to Java 17 brings numerous benefits, including improved performance, language-level enhancements, increased security, and extended APIs and libraries. As many third-party vendors discontinue support for Java 8, adopting the new LTS release cadence ensures better security, compliance, and performance.

Do We Need to Migrate Even Without Java Code or Custom Connectors?

Does not having any Java code or custom connectors mean we can skip the migration? The answer is a big no. Everyone needs to get on board with this update. The core system is changing, and this affects everyone. Whether you’re using a custom Java module or connector or not, you’ll need to upgrade.

  • Update your project’s Mule version to 4.6
  • Check and update all your extensions, modules, and connectors
  • Ensure compatibility with Mule SDK, XML SDK, and REST Connect

To make this transition smoother, Anypoint Studio 7.17 will be released at the same time as Mule 4.6. This will help you manage the migration process more efficiently.

What is the Timeline for Java Support in MuleSoft?

Here’s a brief overview of the support timeline for different Java versions in MuleSoft:

Mule VersionRelease DateJava VersionEnd of Standard SupportEnd of Extended Support
4.5 EdgeOct 20238 and 11Feb 2024Jun 2024
4.6 LTSFeb 20248, 11, and 17Feb 2025Feb 2026
4.7 EdgeJun 20248, 11, and 17Oct 2024Feb 2025
4.8 EdgeOct 20248, 11, and 17Feb 2025Jun 2025
4.9 LTSFeb 202517Feb 2026Feb 2027
4.9 EdgeFeb 202517Jun 2025Oct 2025

What Should You Consider Before MuleSoft Migration to Java 17?

Even though there is no immediate impact on applications running on currently supported Mule versions or those upgraded to Mule runtime 4.6, it is prudent to start planning your upgrade now., it is prudent to start planning your upgrade now. You should evaluate your integration apps and connectors, ensuring they are compatible with Java 17. This includes Anypoint connectors and any custom connectors you may be using. Additionally, consider the impact on Mule Gateway policies and API proxies, as these components rely on Java and must be updated.

Specifics on Upgrading Mule Runtime & Mule Apps

Mule Runtime – To harness the enhanced performance and security benefits of Java 17, it’s essential to upgrade to Mule runtime 4.6 or later.

Here’s how to proceed:

  • Begin by upgrading your standalone Mule instances.
  • Update on-premises Mule instances that are managed through Runtime Manager.
  • Make sure to update the Mule version used in building your Mule applications.
  • Deploy your applications on a target environment running Mule 4.6 or newer.

Mule Apps – You can update, test, and redeploy most of your current Mule apps to utilize Java 17. However, apps and connectors incorporating custom Java code will require additional steps for certification. Before upgrading your integration apps or Mule Gateway policies and proxies to Java 17, ensure all extensions, modules, and connectors used within these components are also upgraded to Java 17 to maintain compatibility and functionality.

Best Practices for MuleSoft Migration to Java 17

To ensure a smooth MuleSoft Migration to Java 17, follow these best practices.

  • Begin by upgrading all standalone Mule instances to Mule runtime 4.6 or later.
  • On-premises Mule instances managed through Runtime Manager should also be updated.
  • Update your Mule applications to be built using the latest Mule version and ensure they are deployed to a target running Mule 4.6 or later.

What Are the Key Benefits of MuleSoft Migration to Java 17?

MuleSoft Migration to Java 17 offers several advantages:

  • Java 17 introduces a new JIT compiler that significantly improves code execution speed, resulting in enhanced performance.
  • Memory management has been optimized, resulting in decreased request latency and more consistent performance.
  • Java 17’s default TLS cipher selection enhances both security and performance. Ongoing updates and patches tackle security vulnerabilities, a critical aspect as third-party vendors discontinue Java 8 support.
  • MuleSoft migration to Java 17 not only ensures better security and compliance but also gives developers access to the latest APIs and libraries, greatly enhancing development capabilities.

How Does MuleSoft Migration to Java 17 Improve Performance?

Java 17 brings significant performance improvements to MuleSoft products, thanks to its new JIT compiler that enhances code execution speed.

Memory Management

Java 17 implements a new memory management strategy, different from earlier versions like Java 8. This approach reduces request latency and ensures more predictable workload execution by prioritizing heap memory commitment in certain scenarios. However, the effectiveness can vary depending on the application.

To optimize performance and leverage Java 17 enhancements effectively, it’s crucial to conduct comprehensive performance testing and monitoring for:

  • Large batch applications
  • Applications operating near their CPU and memory limits

For on-premises deployments:

  • Allocate a minimum of 1400 MB memory for 0.50 vCPU replica sizes on Runtime Fabric, adjusting as necessary based on specific application requirements.
  • In hybrid or standalone environments, fine-tune the garbage collection algorithm of your operating system for optimal performance.

Default TLS Cipher Selection

With Java 11 and later, servers determine cipher preferences based on the client’s supported list, which differs from previous versions where client preferences dictated priority. Upgrading may lead to cipher renegotiation, impacting the balance between security and performance.

For customizing cipher defaults:

  • Consult guidelines on specifying protocols and cipher suites according to your specific security and performance needs.

To maximize these benefits, conduct performance testing and monitoring, especially for large batch applications or those nearing their CPU and memory limits.

Updating Anypoint Connectors

To upgrade connectors provided by MuleSoft, follow these steps.

  • Navigate to Runtime Manager and ensure that your Mule application, which includes the connectors, is upgraded to operate on Mule runtime version 4.6 or a newer iteration.
  • Access Anypoint Studio and modify the project properties to align with the target JDK version.
  • Opt for JDK 17 in the configuration settings. Anypoint Studio will automatically prompt you to initiate updates for the connectors integrated into your project.
  • During the packaging phase, Anypoint Studio will offer guidance and notifications regarding any connectors within your project that may not be compatible with the selected JDK version.
  • Deploy your applications to a suitable environment that runs on Mule 4.6 or a more recent version. Runtime Manager will generate alerts if discrepancies exist between the Java version used in your project and the deployment environment.

For connectors that include custom code, refer to the Custom Connectors section for additional instructions tailored to your specific requirements.

Migrating MuleSoft Policies and API Proxies

MuleSoft-included Mule Gateway policies and API proxies will support Java 17 starting with Mule runtime 4.6. Ensure your policies and proxies are updated before upgrading your Mule apps to Java 17.

Policies: Starting with the Mule runtime 4.6 release, MuleSoft’s included Mule Gateway policies are now compatible with Java 17. These policies will continue to support Java 8 until February 2025. It’s recommended to begin updating your policies as soon as possible to ensure compatibility and security for your API proxies or Mule applications during upgrades.

API Proxies: Similarly, MuleSoft’s included API proxies are now compatible with Java 17 with the release of Mule runtime 4.6. Support for Java 8 will also continue until February 2025. To ensure a smooth transition and protect your API proxies or Mule applications during updates, it’s advised to prioritize upgrading your API policies first before proceeding with your proxies or applications. For detailed instructions on upgrading your proxy applications, refer to the documentation on Upgrading API Proxies.

Anypoint Studio and Java 17

Starting from Anypoint Studio (version 7.17 onwards), you can adjust the Java version used in your projects to upgrade or downgrade the JVM, provided your Mule application runs on Mule runtime 4.6 or later.

Studio 7.17 provides compatibility support:

  • During app packaging, Studio alerts you in real time about any incompatible connector versions or project mismatches to prevent deployment issues.
  • When adding new connectors or modules, Studio displays the supported JVM versions for each version.
  • If you upgrade an existing Studio project to Java 17, Studio automatically checks Exchange and suggests which extensions (modules and connectors) in your app need upgrading.
  • When deploying an app to CloudHub from Studio, Runtime Manager checks for Java version mismatches between your project and the deployment environment (e.g., Java 8 project to Java 17 environment), providing guidance to avoid deployment failures.

Need Help with MuleSoft Migration to Java 17?

The MuleSoft migration to Java 17 is a significant step towards modernizing MuleSoft environments, offering enhanced performance, security, and compliance. By planning and executing the upgrade carefully, you can ensure a seamless transition and leverage the full benefits of Java 17.

Need assistance with the MulleSoft migration to Java 17 or have any other MuleSoft-related inquiries, Book meeting with us. We are here to help ensure your transition is smooth and successful.

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