Generating hmb and schema

squeebie · **Joined:** Thu Oct 23, 2003 1:17 pm **Posts:** 44

I've been looking for a few hours now, and it seems like with all the tools, there must be a way, but I just can't find it.

I have an already existing object model and would like to generate the hbm files and schema for using hibernate. I can't seem to find a tool that does this well. I tried out the JBoss IDE that has the tools build in, but can only get it to generate the hbm for a single class, and it doesn't even generate the hbm with all the fields.

Am I missing something? Doing something wrong?

Thanks in advance.

max · **Posted:** Wed Nov 08, 2006 4:57 pm

from .class/.java we don't have anything (yet).

People normally uses annotations to transform their java model to a persistent java model.

The ide can definitly be improved in this area - bug reports and patches are welcome in our jira!

squeebie · **Joined:** Thu Oct 23, 2003 1:17 pm **Posts:** 44

max wrote:

from .class/.java we don't have anything (yet).

When you say "we", you mean JBoss? Is there anything out there that does?

Thanks again.

david · **Posted:** Wed Nov 08, 2006 7:52 pm

From .java/.class has the problems of limited meta data to generate a clean HBM. Options are usually 1) Annotations or 2) Xdoclet. In the past H2 Tools package had a class2hbm tool which was very rough and not maintained for some time. It was dropped when going to H3 tools set. You could try it I guess but don't expect much of a result - it will require editing. If you have the domain model then a database schema might be faily easy to create. Then the DB could be reverse engineered. Only need to modify the result to fit your domain model - might be faster. In anycase, you have some work to do.

squeebie · **Joined:** Thu Oct 23, 2003 1:17 pm **Posts:** 44

Great, thanks for the info Max and David.

max · **Posted:** Thu Nov 09, 2006 3:40 am

we as in the Hibernate project.

as david explains class2hbm were dropped since it had conceptual limitations and too many bugs. Alot of these were "fixed" when jdk1.5 got generics which allow you to deduce more about the system.

One of the things I would like to do is to have an option in Hibernate Annotations to not require @Entity and @Id on entities which then can be used to have a better class2hbm.

Another alternative is to depend on eclipses javamodel and enhance the hbm.xml wizard to provide options to generate for the properties in there.