映射异常:InvocationTargetException

我这里有个小问题,希望有人能帮我。

我想做一个从对象到整数的映射。对象被标记为获取类型。懒惰.

进行映射时,会收到以下错误消息:

11:31:46,569 ERROR MappingProcessor:253 - Field mapping error -->
  MapId: null
  Type: null
  Source parent class: ClassA
  Source field name: MyObjectProperty
  Source field type: null
  Source field value: null
  Dest parent class: ClassB
  Dest field name: myIntegerProperty
  Dest field type: java.lang.Integer
org.dozer.MappingException: java.lang.reflect.InvocationTargetException
    at org.dozer.util.MappingUtils.throwMappingException(MappingUtils.java:88)
    at org.dozer.util.ReflectionUtils.invoke(ReflectionUtils.java:258)
    at org.dozer.propertydescriptor.GetterSetterPropertyDescriptor.invokeReadMethod(GetterSetterPropertyDescriptor.java:234)
    at org.dozer.propertydescriptor.GetterSetterPropertyDescriptor.getPropertyValue(GetterSetterPropertyDescriptor.java:68)
    at org.dozer.fieldmap.FieldMap.getSrcFieldValue(FieldMap.java:82)

内部异常:

Caused by: java.lang.IllegalStateException: Attempt to access an unloaded field of detached instance

有趣的是,我可以用另一种方法成功地映射字段,所以整数到对象。

谢谢大家。