jackson and guava multimap serialization and deserialization.

[Pablo Conesa]

Hi guys! I need some help on something I believe should be easy but I'm not getting it right.

I want to serialise and deserialise this Table Class (vary simplified for clarity purposes):

import com.google.common.collect.LinkedHashMultimap;

public class Table {

 private LinkedHashMultimap<String,Field> fields;


 public Table(){
 this.fields = LinkedHashMultimap.create();
 };


 public Table (LinkedHashMultimap<String, Field> fields){
 this.fields= fields;
 }


 public LinkedHashMultimap<String, Field> getFields() {
 return fields;
 }


 public void setFields(LinkedHashMultimap<String, Field> fields) {
 this.fields = fields;
 }


}

Before I didn't have the default constructor.

I'm aware of this, but Im not returning a multimap, the multimap sits in the middle of a complex data structure, and the jackson-datatype-guava dependency, which I believe is there to solve my "basic" problem.

I have added the guava module to the ObjectMapper as well, but calling readValue();

 // Add guava serialization for multimaps (Table.Fields is a multimap now).
 ObjectMapper mapper = new ObjectMapper();
 mapper.registerModule(new GuavaModule());

return mapper.readValue(response, valueType);

I've tried different approach but all of them have "polluted" my Table class with @JsonIgnore annotations, @JsonProperites with additional getters and setters to bypass multimap returning and receiving a Java Map, and then converting the map into a multimap. Since it still hasn't work and I feel I'm going in the wrong direction I'm posting my case here.

I'm sorry if this is a very naive question, It's not clear to me how should I use the jackson-datatype-guava dependency.....probably I'm just missing a good example link or a more exhaustive documentation than JacksonModuleGuava, JacksonFeatureModules, or the 404 page I get with the link at the bottom of the jackson-guava github repo.

Shall I implement a serialiser, deserialiser?

[Tatu Saloranta]

Yes, your usage of Guava module is correct, and it should work that way, with no custom annotations.

What is the specific problem you are having? The usual way to trouble-shoot would be to start with an instance, serialize, and see how structure is serialized by Jackson (given that for some types there are multiple structural choices); this should then be structure Jackson expects for deserialization.

-+ Tatu +-

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