Convert Object with nested Objects to HashMap.

[Tyler Reid]

I have a complex object and for some of the nested objects I need to serialize them into JSON fields instead of JSON objects.

Eg.

public class Outer {
    private String someField;
    private AnotherClass anotherField;
}

public class AnotherClass {
    @XmlElement(name = "useThisName")
    private String someField;
    private String anotherField;
}

How can I make a custom serializer that will be for the nested object and obey the annotations so the fields are named properly?

My use case for this is to use the ObjectMapper.convertValue() method to create a Map so that I can loop through it and create NameValuePairs for a rest url.

In the end I am hoping to end up with a

Map<String, String> 

That I can loop over and create apache BasicNameValuePairs from.

Below is some code I want to use for the end result if I can get everything to serialize properly.

Map<String, String> parameters
        = DefaultJacksonMapper.getDefaultJacksonMapper().convertValue(obj, LinkedHashMap.class);

        return parameters
        .entrySet()
        .stream()
        .map(entry -> new BasicNameValuePair(entry.getKey(), entry.getValue()))
        .collect(Collectors.toList());

If I convert this to a map now my output is like:

"someField" -> "data"
"anotherField" -> "size = 2"

I am trying to get the Map to have the following output which I feel like I need a custom serializer.

"someField" -> "data"
"useThisName" -> "data"
"anotherField" -> "data"

[Tatu Saloranta]

I don't think custom serializer/deserializer is the absolute necessity yet.

You can first try

public class Outer {
    private String someField;

    @JsonUnwrapped

    private AnotherClass anotherField;
}

to "unwrap" JSON Object around properties of AnotherClass.

-+ Tatu +-

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