[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Equivalent of @GeneratedValue in JBoss-4.0.5.GA
Hi,
I am working on an application through which messages can be send to JMS Topic from
browser and the MessageBean will store the received messages to a table called newsentity
in postgresql database. The Entity Class name is NewsEntity. My application server is
JBoss-4.0.5.GA and version is J2EE 1.4.
The table newsentity contains 3 fields - id, title and body. The id field is the PK and
it's type is BIGSERIAL.
Since the id field will auto increment, I did not set any value to the id field while
sending message to MessageBean.
| InitialContext ctx = new InitialContext();
| topic = (Topic) ctx.lookup("topic/mdb");
| TopicConnectionFactory factory =
| (TopicConnectionFactory)
ctx.lookup("ConnectionFactory");
| connection = factory.createTopicConnection();
| session = connection.createTopicSession(false,
| TopicSession.AUTO_ACKNOWLEDGE);
| messageProducer = session.createProducer(topic);
|
| ObjectMessage message = session.createObjectMessage();
| // here we create a NewsEntity, that will be sent in JMS message
|
| NewsEntity e = new NewsEntity();
|
| e.setTitle(title);
| e.setBody(body);
|
| message.setObject(e);
| messageProducer.send(message);
| messageProducer.close();
| connection.close();
| response.sendRedirect("ListNews");
|
|
|
But when I post message, I get the error 'Internal Exception:
org.postgresql.util.PSQLException: ERROR: null value in column "id" violates
not-null constraint. Call: INSERT INTO NEWSENTITY (ID, TITLE, BODY) VALUES (?, ?, ?)'
I assume this problem occured because I could not provide the annotation @GeneratedValue
as GenerationType.AUTO in NewsEntity Class since the J2EE version is 1.4. Most of the
annotation types are not supported in 1.4.
| package ejb;
|
| import java.io.Serializable;
| import javax.persistence.Entity;
| //import javax.persistence.GeneratedValue;
| //import javax.persistence.GenerationType;
| import javax.persistence.Id;
| //import javax.persistence.Table;
|
| @Entity
| //@Table(name="NewsEntity", schema="public",
catalog="postgres")
| public class NewsEntity implements Serializable {
| private static final long serialVersionUID = 1L;
| @Id
| //@GeneratedValue(strategy = GenerationType.AUTO)
|
| private Long id;
| private String title;
| private String body;
|
If I remove the comment of the lines in Bold, I will get error - Unknown class while
building the application.
Can any one provide me the way to define that the id field in NewsEntity class will be
auto-generated? If I can do so then I need to pass value to id field while posting data to
JMS topic. Thank you for your kind attention.
Regards
Rajesh
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4182599#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...