Description hawk xu 2017-09-03 22:02:22 EDT

1. I declared an entity class to use Property Access by put @Id Annotation on Getter Methods

2. the entity class using @IdClass annotation and declared as JavaFX property format.

3. the id class declared as JavaFX property format also.

4. when using EntityManager.find(<id class object>), the EntityManager can not get result

5. I debug and debug, then found that the EclipseLink always use FieldAccess for the Id Class object even the Entity Class set to Property Access

6. Please see org.eclipse.persistence.internal.jpa.CMP3Policy source code:
it use PropertyAccess only if NoSuchField in Id Class:

try {
  pkAttributes[i] = new FieldAccessor(this, getField(currentKeyClass, fieldName), fieldName, field, mapping, currentKeyClass != keyClass);
  fieldToAccessorMap.put(field, pkAttributes[i]);
  noSuchElementException = null;
} catch (NoSuchFieldException ex) {
  String getMethodName = null;
  String setMethodName = null;
  .....
}