[appengine-java] Problems with entity groups in transactions

[Patrizio Munzi]

Hi all, I found another strange (unexpected behavior for me) with my two simple Parent and Child classes and Entity Groups. ASAIK in a transaction can be manipulated any object as long as they belong to the same entity group. Now, I cannot understand why I'm getting a Fatal exception when I try to persist in a transaction an object for whom I set the encoded key as child of the same parent. Snippet in the following. Hope, Someone can help! Thanks Here's the snippet and my classes: ----------------- SNIPPET ------------------------------     public void testTransactions()  {         String parentId = "parent";         String childId_1 = "child-1";         String childId_2 = "child-2";         PersistenceManager pm = PMF.get().getPersistenceManager();         pm.currentTransaction().begin();         Parent parent = new Parent();         parent.setId(parentId);         Child child = new Child();         child.setId(childId_1);         child.setValue(100);         parent.setChild(child);         pm.makePersistent(parent);         pm.currentTransaction().commit();         pm.close();         pm = PMF.get().getPersistenceManager();         pm.currentTransaction().begin();         String parentEncodedKey = KeyFactory.createKeyString(Parent.class.getSimpleName(), parentId);         parent = pm.getObjectById(Parent.class, parentEncodedKey);         assertEquals(100, parent.getChild().getValue());         parent.getChild().setValue(1000);         child = new Child();         child.setId(childId_2);         Key child2Key = KeyFactory.createKey(KeyFactory.stringToKey(parentEncodedKey), Child.class.getSimpleName(), childId_2);         child.setEncodedKey(KeyFactory.keyToString(child2Key));         child.setValue(10);         pm.makePersistent(child);         pm.makePersistent(parent);         pm.currentTransaction().commit();         pm.close();         pm = PMF.get().getPersistenceManager();         pm.currentTransaction().begin();                parentEncodedKey = KeyFactory.createKeyString(Parent.class.getSimpleName(), parentId);         parent = pm.getObjectById(Parent.class, parentEncodedKey);         assertEquals(1000, parent.getChild().getValue());         pm.currentTransaction().commit();         pm.close();     }        ----------------------------------------------- ---------------- PARENT ------------------------------- @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Parent implements Serializable {     private static final long serialVersionUID = -3051163582728562957L;     @PrimaryKey     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)     @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true")     protected String encodedKey;     @Persistent     @Extension(vendorName="datanucleus", key="gae.pk-name", value="true")     private String id;         @Persistent(defaultFetchGroup="true")     @Element(dependent="true")     private Child child;         public String getEncodedKey() {         return encodedKey;     }     public void setEncodedKey(String encodedKey) {         this.encodedKey = encodedKey;     }     public String getId() {         return id;     }     public void setId(String id) {         this.id = id;     }     public Child getChild() {         return child;     }     public void setChild(Child child) {         this.child = child;     }     } ----------------------------------------------- ------------------- CHILD ---------------------------- @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Child implements Serializable {     private static final long serialVersionUID = -3051163582728562957L;     @PrimaryKey     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)     @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true")     protected String encodedKey;     @Persistent     @Extension(vendorName="datanucleus", key="gae.pk-name", value="true")     private String id;         @Persistent     private long value;         public String getEncodedKey() {         return encodedKey;     }     public void setEncodedKey(String encodedKey) {         this.encodedKey = encodedKey;     }     public String getId() {         return id;     }     public void setId(String id) {         this.id = id;     }     public long getValue() {         return value;     }     public void setValue(long value) {         this.value = value;     }     } ----------------------------------------------- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---