Hi!

I use JBOSS 4.0.5GA and get always following exception:

11:06:47,445 WARN [JDBCExceptionReporter] SQL Error: 0, SQLState: null
11:06:47,445 ERROR [JDBCExceptionReporter] failed batch
11:06:47,445 ERROR [AbstractFlushingEventListener] Could not synchronize database state with session
org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update
 at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:249)

... and I don't know why :-(.

My local client Code:

 public void testMessage() throws Throwable {
 TestStarterRemote testStarter = getTestObject();

 // build messages
 for (int i = 0; i < 10; i++) {

 Message msg = new Message();

 // add properties to each message
 Set<Propertie> properties = new HashSet<Propertie>();
 for (int n = 0; n < 2; n++) {
 //i must set the id here, because I want to insert the property
 //into a hashset
 properties.add(new Propertie(n, "key" + n, "value" + n));
 }

 msg.setHeaderProperties(properties);

 // if i==1: an error is being thrown here
 msg = testStarter.merge(msg);
 }
 }

The message class:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Message extends EntityWithIntId implements Serializable {

 private static final long serialVersionUID = 1L;

 private Set<Propertie> headerProperties = new HashSet<Propertie>();

 private long id;

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 public long getId() {
 return id;
 }

 public void setId(long id) {
 this.id = id;
 }


 public Message() {
 }

 @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.EAGER)
 public Set<Propertie> getHeaderProperties() {
 return headerProperties;
 }


 public void setHeaderProperties(Set<Propertie> properties) {
 this.headerProperties = properties;
 }}

My property class:

@Entity
public class Propertie extends EntityWithIntId implements Serializable {

 private static final long serialVersionUID = 1L;

 private String key;

 private Serializable value;

 private long id;

 public Propertie() {
 }

 public Propertie(long id, String key, Serializable value) {
 super();
 this.setKey(key);
 this.setValue(value);
 this.setId(id);
 }

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 public long getId() {
 return id;
 }

 public void setId(long id) {
 this.id = id;
 }

(...)
}

And now, maybe the root of all my problems, the base class:

public abstract class EntityWithIntId {

 public abstract long getId();

 /**
 * two entities are equal if they have the same class and the same id
 *
 * @see java.lang.Object#equals(java.lang.Object)
 */
 @Override
 public boolean equals(Object obj) {
 if (obj == null || !obj.getClass().equals(this.getClass())) {
 return false;
 }
 EntityWithIntId tmp = (EntityWithIntId) obj;

 return tmp.getId() == this.getId();
 }

 @Override
 public int hashCode() {
 return new Long(this.getId()).hashCode();
 }

I set the id of the each properties object in my client. The id is autmatically generated if the propertie is persisted. Is that the root of my problem. Has hibernate a problem with that?

Thanks for your help
Meinert