Quotes must be appied to fields in queries.
The environment log is:

org.hibernate.cfg.Environment Hibernate 3.2 cr1
org.hibernate.cfg.SettingsFactory RDBMS: MySQL, version: 4.1.16
org.hibernate.cfg.SettingsFactory JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-3.1.12
org.hibernate.dialect.Dialect Using dialect: org.hibernate.dialect.MySQLDialect

I have an entity, named Group:

@Entity
public class Group {
..
}

But, 'GROUP' is the reserved word of MySQL query language.
Log of hibernate show, that queries is without quotes:

org.hibernate.persister.entity.AbstractEntityPersister Static SQL for entity: org.dicr.isp.entity.Group
org.hibernate.persister.entity.AbstractEntityPersister Version select: select id from Group where id =?
org.hibernate.persister.entity.AbstractEntityPersister Snapshot select: select group_.id, group_.name as name0_, group_.comment as comment0_ from Group group_ where group_.id=?
org.hibernate.persister.entity.AbstractEntityPersister Insert 0: insert into Group (name, comment, id) values (?, ?, ?)
org.hibernate.persister.entity.AbstractEntityPersister Update 0: update Group set name=?, comment=? where id=?
org.hibernate.persister.entity.AbstractEntityPersister Delete 0: delete from Group where id=?
org.hibernate.persister.entity.AbstractEntityPersister Identity insert: insert into Group (name, comment) values (?, ?)

And this make a critical error in program logic:

org.hibernate.tool.hbm2ddl.DatabaseMetadata table not found: Group
ERROR org.hibernate.tool.hbm2ddl.SchemaUpdate Unsuccessful: create table Group (id bigint not null auto_increment, name varchar(255) not null unique, comment varchar(255), primary key (id))
ERROR org.hibernate.tool.hbm2ddl.SchemaUpdate You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Group (id bigint not null auto_increment, name varchar(255) not null unique, com' at line 1
[2006-04-27 23:57:23,895] INFO org.hibernate.tool.hbm2ddl.SchemaUpdate schema update complete

The query: "create table Group (id bigint ..." is not correct.
Must be: "create table `Group` (`id` bigint ..."