java - JacksonMapper to deserialize null value -

i going deserialize json null value java object empty string

i able make custom deserializer, when json value null, did not go deserializer.

how should deserialize it?

thanks in advance!

public class customstringdeserializer extends jsondeserializer<string> { @override public string deserialize(jsonparser jsonparser, deserializationcontext deserializationcontext) throws ioexception,         jsonprocessingexception {      string str = jsonparser.gettext();      try {         return (str == null) ? "" : str;     } catch (exception e) {         throw new runtimeexception(e);     }  } 

}

   public customobjectmapper() {         simplemodule _module = new simplemodule("module", new version(1, 9, 10, "final"));         _module.adddeserializer(string.class, new customstringdeserializer()); } 

thanks @nutlike
i

    @override public string getnullvalue() {     return ""; } 

maybe sufficient overwrite method getnullvalue()?

public class customstringdeserializer extends jsondeserializer<string> {  @override public string deserialize(jsonparser jsonparser,         deserializationcontext deserializationcontext) throws ioexception,         jsonprocessingexception {      return jsonparser.gettext();  }  @override public string getnullvalue() {     return ""; }  }