Question

To get more familiar with the new Java EE 6 System I have created a little demo application that should be able to store some user input in a postgres database.

I am using:
– glassfish 3.1
– Postgres 9.1
– OpenJPA 2.1.1

For this purpose I wrote following entity:

@Entity
public class User implements Serializable
{

@Id
@GeneratedValue(generator="user_seq",strategy=GenerationType.SEQUENCE) 
@SequenceGenerator(name="user_seq", sequenceName="user_seq",allocationSize=1) 
public Long id;

The database is completely empty and the connection pool is configured in glassfish. My persistence.xml looks like this:

 <persistence-unit name="myDatabase" transaction-type="JTA" >
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
    <jta-data-source>jdbc/myDatabase</jta-data-source>
      <properties>
          <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema" />
          <property name="openjpa.jdbc.DBDictionary" value="postgres" />
        </properties>
</persistence-unit>

Due to the fact, that I dont want to insert all db-objects myself, I activated the automatic schema creation in my jpa properties. With the first start openjpa (or maybe postgre) creates a new sequence named ‘user_seq’ as mentioned in the annotations of the entity.
This works fine. But then openjpa wants to create the table ‘user’ and throws following exception:

Caused by: org.apache.openjpa.lib.jdbc.ReportingSQLException: 
FEHLER: Syntaxfehler bei »User«
    Position: 14 {stmnt 31631786 CREATE TABLE User 
        (id BIGINT NOT NULL, userlastlogin VARCHAR(255), username VARCHAR(255),
         userpassword VARCHAR(255), PRIMARY KEY (id))} [code=0, state=42601]

The SQL-Statement seems to be fine. If I create the table ‘user’ myself, I get the ReportingSQLException that openjpa is not able to insert the entity in the existing table.

First I thought that openjpa and postgre both wants to create the sequence with activated schema-creation. So changed the property to:

<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(Sequences=false)" />

Unfortunately this did not work either.

What else can I say.. Hm.. My DAO looks like this:

@Stateless
public class DAOService
{
@PersistenceContext
protected EntityManager em;

public <T> T create(T t)
{
    this.em.persist(t);
    this.em.flush();
    this.em.refresh(t);
    return t;
}

Thanks for your help.

Answer 1

Perhaps ‘User’ is a reserved keyword on postgres? Can you try specifying the name of your Entity to be User0 or something?