[jboss-user] [EJB 3.0] - Getter for LAZY property gets called on every commit

[markus.doering]

Hello,
First of all, i'm working with JBoss 4.2.0 GA and MySQL 5.
I have the following code for my EntityBeans:

EntityBean1
@Entity
  | public class EntityBean1 {
  |     private long id;
  | 
  |     private byte[] data;
  | 
  |     private boolean active;
  | 
  |     private EntityBean2 relation;
  | 
  |     @Id
  |     @GeneratedValue(strategy=GenerationType.AUTO)
  |     public long getId() {return this.id;}
  | 
  |     public void setId(long id) {this.id = id;}
  | 
  |     public boolean isActive() {return this.active;}
  | 
  |     public boolean setActive(boolean active) {this.active = active;}
  | 
  |     @Lob
  |     @Column(columnDefinition = "LONGBLOB")
  |     @Basic(fetch = FetchType.LAZY)
  |     public byte[] getData() {
  |         log.debug("getData called");
  |         return this.data;
  |     }
  | 
  |     public void setData(byte[] data) { this.data = data;}
  | 
  |     @ManyToOne
  |     public EntityBean2 getRelation() {return this.relation;}
  | 
  |     public void setRelation(EntityBean2 relation) {this.relation = relation;}
  | }

EntityBean2
@Entity
  | public class EntityBean2 {
  |     private long id;
  | 
  |     private List<EntityBean1> relation;
  | 
  |     @Id
  |     @GeneratedValue(strategy=GenerationType.AUTO)
  |     public long getId() {return this.id;}
  | 
  |     public void setId(long id) {this.id = id;}
  | 
  |     @OneToMany(mappedBy = "relation", cascade = cascadeType.ALL)
  |     public List<EntityBean1> getRelation() {return this.relation;}
  | 
  |     public void setRelation(List<EntityBean1> relation) {this.relation = relation;}
  | }

SomeStatelessSessionBean
@Stateless
  | public class SomeStatelessSessionBean implements SomeStatelessSessionLocal {
  | 
  |     public List<EntityBean1> doSomething() {
  |         log.debug("doSomething started");
  |         List<EntityBean1> out = new ArrayList<EntityBean1>();
  |         EntityBean2 bean2 = someFinder();
  |         for(EntityBean1 bean1 = bean2.getRelation()) {
  |             if(bean1.isActive()) {
  |                 out.add(bean1);
  |             }
  |         }
  |         log.debug("doSomething ended");
  |         return out;
  |     }
  | }

What i do is calling the doSomething() methode from somehwere with a log.debug("start"); before and a log.debug("end"); directly after the methode call.

What i get is the following log:

  |     XXX DEBUG start
  |     XXX DEBUG doSomething started
  |     XXX DEBUG doSomething ended
  |     XXX DEBUG getData called
  |     XXX DEBUG getData called
  |     XXX DEBUG getData called
  |     XXX DEBUG getData called
  |     XXX DEBUG getData called
  |     XXX DEBUG end
  | 


What does this means?
As far as i can see, when the transaction from doSomething() is commited, the getData() methode of the EntityBean1 get called. This should NOT be the case, because it is set to LAZY and i NEVER use the byte[] in this case.

My problem is that the byte[] might be large, and at some point, i get an OOMException: heapSize. I've done a HeapDump and saw LOTS of byte[] in the memory, that's how i found this strange behavier. I also checkt if the getData() get's called by the equals() or hashCode() methode of EntityBean1, but this is not the case.

Is this a bug in EJB3 (hibernate?) or is something "wrong" with my code? Or is it working as designed and there are no "real" lazy byte[] propertys?

Thanks for help

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