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Suppose I have the following three classes (getters and setters left out for brevity): @JsonAutoDetect public class InfoCollection{ private InfoType1 info1; private InfoType2 info2; } @JsonAutoDetect public class InfoType1{ private String fieldA; } @JsonAutoDetect public class InfoType2{ private String fieldB; } I"m trying to write a JsonSerializer.serialize() function that serializes an InfoCollection object in this format: { "allInfo":{ "fieldA":"foo", "fieldB":"bar" } } This is what I have now: jsonGenerator.writeStartObject(); jsonGenerator.writeFieldName("allInfo"); jsonGenerator.writeObject(myInfoCollection.getInfo1()); jsonGenerator.writeObject(myInfoCollection.getInfo2()); jsonGenerator.writeEndObject(); which is causing the following exception: org.codehaus.jackson.JsonGenerationException: Can not start an object, expecting field name Am I missing something small or am I totally going about this the wrong way? NOTE: A couple of the proposed solutions so far involve writing each individual field of InfoType1 and InfoType2 . I am looking for a solution that does not require this because I'd like to use the solution on huge classes with many fields.

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