Hello,
This problem is solved in my case.
The Derby was in separate process (JVM) so in seam-gen databse driver
must be given as 'org.apache.derby.jdbc.ClientDriver' and
hibernate.connection.dataSource_class=org.apache.derby.jdbc.ClientDataSource
Now the application works with other tables but not with table Component, because it is reserved for Seam, JSF ?
The name of this table must be changed.
Good articles relatde to JBoss Derby configurations are
http://alistairisrael.wordpress.com/2009/03/31/creating-derby-datasource-in-jboss/
http://www.coderanch.com/t/217343/ORM/java/help-configuring-Jboss-EJB-Derby
http://beatgates.blogspot.com/2009/04/run-glassfish-v2-ejb3-example-on-jboss.html
http://sites.google.com/site/olivabianco/java-blog/jbossderbyhowtoconfigure
Remember this EmbeddedDriver vs. ClientDriver matter. ( See from Derby docs)