Trying to serialize and deserialize a class in Java

[olive citrus]

Hey guys im trying to serialize a class which contians a Map which maps another Java Object to a number. I'm using Jackson Object Mapper. it works for converting it into a Json String but deserialsing a JSON string back to the Java object is giving an error called "Cannot find a Map key deserializer for simpleTYpe, class model.user

[keen elk]

<@&987246399047479336> please have a look, thanks.

[summer forge]

show the json and the class you are trying to deserialize into