Hi,

on trying to udpate a detached instance, i am getting:

<openjpa-1.1.0-r422266:657916 nonfatal store error>
org.apache.openjpa.persistence.EntityExistsException: Attempt to
persist detached object "de.logentis.bwh.model.Box-1". If this is a
new instance, make sure any versino and/or auto-generated primary key
fields are null/default when persisting.

Code is pretty easy:

// find box for current order
        Box box = boxDao.findNextFreeBox(BoxType.STANDARD); //
use express for lowInv ???
        box.setOrderId(o.getId());
        box.setLastUsed(new Date());
        boxDao.save(box);

where boxDao.save() is only a wrapper to em.persist(object). The code
above is non-transactional, only the DAO ist. Below my entity
definition:

@Entity
@VersionColumn(name = "_version")
@Table(name = "boxes")
public class Box {

  @XmlTransient
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  String oid;

  @Column(name = "id")
  String id;

  @Column(name = "orderid")
  String orderId;

  @Column(name = "lastused")
  Date lastUsed;

  @Basic
  @Enumerated(EnumType.STRING)
  @Column(name = "boxtype")
  BoxType type;

  public String getId() {
     return id;
  }

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

  public String getOrderId() {
     return orderId;
  }

  public void setOrderId(String orderId) {
     this.orderId = orderId;
  }

  public Date getLastUsed() {
     return lastUsed;
  }

  public void setLastUsed(Date lastUsed) {
     this.lastUsed = lastUsed;
  }

  public BoxType getType() {
     return type;
  }

  public void setType(BoxType type) {
     this.type = type;
  }
}


Can you see anything wrong here?

Thanks.


--
Marc Logemann
blog http://logemannreloaded.blogspot.com
privat http://www.logemann.org