Using Java ObjectMapper to get JSON String

Question

I am using writeValueAsString of the ObjectMapper . However, it's giving me a Java String representation so I get:

{"network_id":5000370004610700049753}

instead of

"{\"network_id\":5000370004610700049753}"

which is failing for other services when deserializing. How do I get this kind of serialization with the ObjectMapper?

Well, the first is a string value with JSON text, as it should be, so that should be what you'd want. Why do you want the second, i.e. that JSON text encoded as a Java or JSON string? — Andreas
– Andreas, Commented Oct 24, 2019 at 12:47
The C# service on the other end of the queue fails to deserialize the first one @Andreas — Cemre Mengü
– Cemre Mengü, Commented Oct 24, 2019 at 12:49
So the C# code doesn't want plain JSON, but a JSON text encoded as a JSON string? That makes no sense, but doable, see answer. — Andreas
– Andreas, Commented Oct 24, 2019 at 12:51

Andreas · Accepted Answer · 2019-10-24 12:55:17Z

5

To get the second result, send it through the ObjectMapper again.

Map<String, Object> data = new HashMap<>();
data.put("network_id", new BigInteger("5000370004610700049753"));

ObjectMapper objectMapper = new ObjectMapper();

String plainJson = objectMapper.writeValueAsString(data);
System.out.println(plainJson);

String encodedJson = objectMapper.writeValueAsString(plainJson);
System.out.println(encodedJson);

Output

{"network_id":5000370004610700049753}
"{\"network_id\":5000370004610700049753}"

answered Oct 24, 2019 at 12:55

Andreas

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1 Comment

Cemre Mengü Over a year ago

Thanks, I agree this is stupid but not sure what's going on on the other end :(

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