What are the recommended best practices for migrating a Mendix application from version 9 to 10?

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I’d like to know what key areas we should focus on during the migration — such as deprecated features, Atlas UI upgrades, module compatibility, Java actions, or changes in runtime behavior.
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2 answers
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Hi Satish, when planning a migration, focus on these key areas,

 

  1. Deprecated Features – Check release notes for removed microflow actions, APIs, or widgets and replace them as needed.

  2. Atlas UI Changes – If you're upgrading Atlas UI (e.g., to Atlas 3), review styling, layout classes, and test custom themes/widgets.

  3. Module Compatibility – Update marketplace modules and ensure custom modules work with the new platform version.

  4. Java Actions – Recompile Java code and check for API or dependency changes, especially if the Java version changes.

  5. Runtime Behavior – Look out for changes in microflow logic, security settings, or background job behavior.

Also, run full regression tests and review Mendix release notes for version-specific changes.

 

I hope this one helps you! :)

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Hello Satish,

 

Best Practices for Migrating from Mendix 9 to 10Pre-Upgrade

 

1. Ensure the app is successfully migrated from your SVN Team Server to Git. 

Migrating to Git | Mendix Documentation

 

2. Backing Up the AppBack up or commit the 9.24 app so you can return to it if necessary.

 

3. Upgrading to Mendix 10

Open the app in Studio Pro 10 and allow it to update and convert the app to version 10.

Review all error messages and messages about deprecated items and make changes where necessary. 

Update these key widgets, resources, and actions: Atlas Core, Community Commons, Data Widgets, Nanoflow Commons, Native Mobile Resources, Mendix SSO.

 

Post-UpgradeTest the app in local first for any unexpected results.

 

Upgrading from Mendix Studio Pro 9 to 10 | Mendix Documentation

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