I did a bit of research and finally got it working but even then decided the liquibase-hibernate integration wasn't providing enough value. I'm very hopeful that in the future it will refine some of these issues but for now it's a no go.
Our environment: liquibase, hibernate, oracle, maven
The hibernate annotation to liquibase generation is currently only generating the table DDL without the validation or creating the sequences to go with the tables.
The generation overwrites the file instead of intelligently appending to an exsisting file so it requires an extra step of copy/paste to the real liquibase file
The hibernate/liquibase plugin uses ant. When the ant task configured into maven there's no way to run it independantly of the build phases w/o configuring a profile
Maven profiles are not inherited, so they must be copy pasted into every model module and can't be put into pom-model.
A hibernate.cfg.xml must exist in the model module for the sole purpose of the liquibase-hibernate conversion
a changelog file must exist in the model module for the sole purpose of generating the liquibase xml to copy from.
The tool will preform a diff against the database, not against an exsisting changelog file so a liquibase/hibernate must connect to that database to compare the hibernate annotations against and then only the difference is put into the changelog file.
re needing a "hibernate.cfg.xml" file – I have added some notes to the docs about how to extract a Configuration from Hibernate when bootstrapping it in EJB/JPA/annotation configuration mode: https://github.com/RichardBradley/liquibase.github.com/commit/d1ac4950df280a140768a8c1421c221203d3c63d
The liquibase-hibernate integration is greatly improved as of version 3.0 which should be released soon after liquibase 3.0.6