I'm not sure if this is the same plugin you are looking for, but there is an Liquibase EJB integration module in the IntelliJ repositories. You can find it in the section "Settings / Plugins / Browse repositories". It is also available here . The latest version is 3 years, although it is probably no longer supported.
Here is his description:
LiquiBase EJB Integration Module for IntelliJ IDEA. Compares LiquidBase Database ChangeLog with an EJB entity model, providing validations and intentions, adding to ChangeLog.
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