Jackson JSON Processor

JsonSerialize fails to serialize for an interface if it is part of List or array

Details

  • Type: Bug Bug
  • Status: Closed Closed
  • Priority: Minor Minor
  • Resolution: Duplicate
  • Affects Version/s: 1.9.3
  • Fix Version/s: None
  • Component/s: Serializer
  • Labels:
    None
  • Environment:
    Linux, Spring /Java
  • Number of attachments :
    0

Description

When serializing an object using an Interface,it serializes using the actual class rather interface. For ex: Interface I1 has getXX method. Class C1 implements I1 and has few other get methods. In the class where I want to serialize, I specify as below.

ObjectWriter objectWriter = new ObjectMapper().writerWithType(new TypeReference<List<I1>>(){});

And then I create a list with I1 as type and add objects of C1 to it.

List<I1> list = new ArrayList<I1>(); list.add(new C1());

Then specify

objectWriter.writeValueAsString(list).

In the output, I see that other getXX methods of C1 being serialized.On I1, I have also specified @JsonDeserialize(as=C1.class)
@JsonSerialize(as=I1.class) and on C1 I specified
@JsonSerialize(as=I1.class, typing=JsonSerialize.Typing.STATIC)

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Tatu Saloranta added a comment -

editing layout for readability

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Tatu Saloranta added a comment - editing layout for readability
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Tatu Saloranta added a comment -

Yes, I can reproduce this problem. However, using 2.0.1 at least using

@JsonSerialize(as=I1.class)

does work; and should with 1.9.7 (to be released soon).
Annotating use of static typing will not unfortunately work (by design), as this is not resolve early enough in this case – it would work for properties, but in this case List is a root-level value, and not a property value.

However, using typed writer does not work; and that is a bug.

I can see why this happens; basically, knowledge that there is explicit type definition ("local static", in a way), is not passed. Solving this is bit tricky, but it needs to be done, so I will try to find a way to do that.

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Tatu Saloranta added a comment - Yes, I can reproduce this problem. However, using 2.0.1 at least using @JsonSerialize(as=I1.class) does work; and should with 1.9.7 (to be released soon). Annotating use of static typing will not unfortunately work (by design), as this is not resolve early enough in this case – it would work for properties, but in this case List is a root-level value, and not a property value. However, using typed writer does not work; and that is a bug. I can see why this happens; basically, knowledge that there is explicit type definition ("local static", in a way), is not passed. Solving this is bit tricky, but it needs to be done, so I will try to find a way to do that.
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Tatu Saloranta added a comment -

On workaround for typed writer is to alternatively enable static typing globally:

ObjectMapper mapper = new ObjectMapper();
mapper.enable(MapperFeature.USE_STATIC_TYPING);

which does actually work (same as adding annotation)

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Tatu Saloranta added a comment - On workaround for typed writer is to alternatively enable static typing globally: ObjectMapper mapper = new ObjectMapper(); mapper.enable(MapperFeature.USE_STATIC_TYPING); which does actually work (same as adding annotation)
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Tatu Saloranta added a comment -

There is an issue at new github issue tracker:

https://github.com/FasterXML/jackson-databind/issues/23

which I think is the same thing, so I will close this one and use it instead. This is part of process of closing down Codehaus Jackson issue tracker.

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Tatu Saloranta added a comment - There is an issue at new github issue tracker: https://github.com/FasterXML/jackson-databind/issues/23 which I think is the same thing, so I will close this one and use it instead. This is part of process of closing down Codehaus Jackson issue tracker.

People

  • Assignee:
    Tatu Saloranta
    Reporter:
    kalaivani sengottaiyan
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Dates

  • Created:
    Updated:
    Resolved: