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Editorial Team
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Asked: 2026-05-30T13:43:29+00:00

I’m using Jackson to serialize a custom class that implements Map<String, String> . But

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I’m using Jackson to serialize a custom class that implements Map<String, String>. But behind the scenes, it’s actually a Map<String, String[]> (this class represents HTTP request parameters), and I’d like for Jackson to serialize it as if it’s a Map<String, String[]>. I had thought that the JsonValue annotation would be perfect for this (I’d annotate a method that returns the inner Map<String, String[]>), but it Jackson seems to be ignoring it. How can I disable Map-style treatment of this class, and have it be serialized either as POJO or via the JsonValue annotation?

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1 Answer

  1. Editorial Team

    Your best choice is a custom serializer/deserializer, since there is no way for Jackson to know that your Map is “faking it” (i.e. its signature is wrong).

    But if @JsonValue does not work, that sounds like a bug.

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