Mapping unpredictable keys from JSON to POJO

Question

I am using the Jackson JSON library to map JSON streams into POJO's. My JSON's keys have unpredictable names. i.e ``` { "Random_ID": { "Another_Random_ID": { "some_key": "value" "some_key1": "value1" } } ... } ``` I would like to map this request to a POJO (with the same structure), however the mapper will fail since there is no such setXXX (where XXX is a random_id - since i cannot predict the name). What would be the best way to map this request to the corresponding object without manually parsing it with createJsonParser.

Accepted Answer

If names are unpredictable, POJOs are not the way to go.

But you can use the Tree Model, like:

```
JsonNode root = objectMapper.readTree(jsonSource);
```

and access it as a logical tree. Also, if you do want to convert the tree (or any of sub-trees, as identified by node that is the root of sub-tree), you can do:

```
MyPOJO pojo = objectMapper.treeToValue(node, MyPOJO.class);
```

and back to tree

```
JsonNode node = objectMapper.valueToTree(pojo);
```

Mapping unpredictable keys from JSON to POJO

Solution

Problem