Serializing with Jackson (JSON) - getting "No serializer found"?
As already described, the default configuration of an ObjectMapper instance is to only access properties that are public fields or have public getters/setters. An alternative to changing the class definition to make a field public or to provide a public getter/setter is to specify (to the underlying VisibilityChecker) a different property visibility rule. Jackson 1.9 provides the ObjectMapper.setVisibility() convenience method for doing so. For the example in the original question, I'd likely configure this as
myObjectMapper.setVisibility(JsonMethod.FIELD, Visibility.ANY);For Jackson >2.0:
myObjectMapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);For more information and details on related configuration options, I recommend reviewing the JavaDocs on ObjectMapper.setVisibility().