Comments on: Generating DDL Scripts from JPA Annotations with Maven

By: Shrirang

Shrirang — Thu, 17 Dec 2009 10:18:45 +0000

Persistence.xml need not be directly in classpath. It expects it to be in folder META-INF

By: Chandan Benjaram

Chandan Benjaram — Sun, 26 Oct 2008 01:04:26 +0000

Hi-

I am trying your approach to generate db(MySQL) schema out of JPA Annotations in Maven way. I am getting following error during project build:
‘[ERROR] Persistence unit not found: ’someunit’.
Build errors for server; org.apache.maven.lifecycle.LifecycleExecutionException: Internal error in the plugin manager executing goal ‘org.codehaus.mojo:hibernate3-maven-plugin:2.0-alpha-2:hbm2ddl’: Mojo execution failed.’

I have my persistence unit in META-INF/persistence.xml and this is the only one XML in my whole project.

For your information, here is my POM.xml hibernate3-maven configuration snippet:

org.codehaus.mojo
hibernate3-maven-plugin
2.0-alpha-2

hbm2ddl
annotationconfiguration

true
true
true
jpaconfiguration
someunit
schema.sql
schema.sql

target/test-classes
target/test-classes

${maven.test.skip}

process-test-resources

hbm2ddl

I tried in Ant way, still no GO :-(
I verified perstence.xml and its is getting into classpath of application.
Do you have any idea about whats wrong with this?

-Chandan Benjaram

By: Kwan

Kwan — Fri, 22 Aug 2008 08:30:47 +0000

When using hibernate config (not jpaConfiguration), these following lines applied (position hibernate.cfg.xml at absolute pasth):- hbm2ddl annotationconfiguration annotationconfiguration hibernate.cfg.xml /Kwan

By: mafr

mafr — Sat, 05 Jul 2008 15:31:44 +0000

The plugin doesn’t know for which flavor of database it should generate the DDL script. You have to supply the “hibernate.dialect” property somehow, either using a hibernate.cfg.xml file or via persistence.xml where you can also set properties for a persistence unit.

By: Bruce

Bruce — Thu, 03 Jul 2008 17:09:23 +0000

Hi,
I’m getting the following error. I don’t have a hibernate config but other than trying to generate the ddl everything works fine. Do I need this file just so that the ddl can be generated?

Thanks

Bruce
[INFO] src/main/resources/hibernate.cfg.xml not found within the project. Trying absolute path.
[INFO] No hibernate configuration file loaded.
[INFO] src/main/resources/database.properties not found within the project. Trying absolute path.
[INFO] No hibernate properties file loaded.
[INFO] ————————————————————————
[ERROR] FATAL ERROR
[INFO] ————————————————————————
[INFO] The dialect was not set. Set the property hibernate.dialect.
[INFO] ————————————————————————

By: mafr

mafr — Wed, 04 Jun 2008 16:39:45 +0000

In your persistence.xml you’ll find an element “persistence-unit” with an attribute “name”. The value of this attribute has to match “persistenceunit” in your maven configuration. You can set them both to “Default”, for example.

You don’t have to add mappings to hibernate.cfg.xml. The maven plugin finds them automatically.

Cheers,
Matthias

By: kumar

kumar — Wed, 04 Jun 2008 11:30:06 +0000

hi,
what do you mean by “Don’t forget to set the persistence unit to whatever you declared in persistence.xml”

To use this do I need to add mappings to all my annotated classes in hibernate.cfg.xml??
thx