What Hibernate Object ID generator is recommanded for PG?

Hi,

Here is what I have:

Java class:

public class User {

private Integer id;
...
}

Hibernate Mapping:

<class name="com.ccc.domain.User" table="users">
<id name="id" type="int" unsaved-value="null"
>
<generator class="native"/>
</id>
...
</class>

DB Table:

create table USERS (
id SERIAL UNIQUE primary key,
...
)

When I call the save(object) method of Hibernate, I
get the following exception:

2005-04-21 13:52:13,859 ERROR
org.springframework.web.servlet.DispatcherServlet -
Could not complete request
org.springframework.jdbc.BadSqlGrammarException: Bad
SQL grammar [] in task 'Hibernate operation'; nested
exception is java.sql.SQLException: ERROR: relation
"hibernate_sequence" does not exist
java.sql.SQLException: ERROR: relation
"hibernate_sequence" does not exist
at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1365)
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1160)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:172)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:387)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:328)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:238)
at
org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:92)
at
net.sf.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:64)
at
net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:774)
at
net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:747)
at
org.springframework.orm.hibernate.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:386)
at
org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:243)
at
org.springframework.orm.hibernate.HibernateTemplate.save(HibernateTemplate.java:383)

It seems the native ID generator doesn't work properly
in PG. After changing the generator to sequence. I get
the same exception. According to the Hibernate
documentation, that is the right way. Any suggestions
on the subject?

Thanks,

Vernon

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