converting Document objects in MongoDB 3 to POJOS

Question

I\'m saving an object with a java.util.Date field into a MongoDB 3.2 instance.

ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsStr         


        

Answer 1

You should define and use custom JsonWriterSettings to fine-tune JSON generation:

 JsonWriterSettings settings = JsonWriterSettings.builder()
         .int64Converter((value, writer) -> writer.writeNumber(value.toString()))
         .build();

 String json = new Document("a", 12).append("b", 14L).toJson(settings);

Will produce:

 { "a" : 12, "b" : 14 }

If you will not use custom settings then document will produce extended json:

 { "a" : 12, "b" : { "$numberLong" : "14" } }