Can I migrate from Drools 6.5 to 10 directly or to 7 and 8 first?

[Javier Hugo]

I am researching how to migrate from Drools 6.5 to 10, and the rhe recommended strategy is to perform the upgrade in stages:

* Migrate from Drools 6.x to 7.x: The shift from Drools 6 to 7 involved major changes, including the move from the old Knowledge API to the KIE API (Knowledge Is Everything).

* Migrate from Drools 7.x to 8.x: The 8.x series introduced the executable model to improve performance, requiring the kie-maven-plugin to generate sources during compilation.

* Migrate from Drools 8.x to 10.x: Drools 10 introduces new features and further refactorings, including a minimum requirement of JDK 11 and deprecation of drools-mvel

Is this correct? Or can I migrate directly from 6.5 to 10?

Thanks

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[Toshiya Kobayashi]

Hello,

You can migrate directly from 6.5 to 10.

https://kie.apache.org/docs/10.1.x/drools/drools/migration-guide/index.html would help even from 6.5.

Cheers,
Toshiya

2025年11月6日木曜日 0:34:17 UTC+9 Javier Hugo:

[956957283]

[Javier Hugo]

I see from 7 to 10, not to 6.x. Or am I missing something?

[956957283]

[Toshiya Kobayashi]

If you see gaps between 6 and 7+, this blog post would help.

https://blog.kie.org/2022/05/upgrade-drools-version.html

Cheers,
Toshiya

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