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Asked: 2026-05-16T23:14:00+00:00

I am using Jackson library’s ObjectMapper for deserializing JSON into Java objects. I am

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I am using Jackson library’s ObjectMapper for deserializing JSON into Java objects. I am using Spring ‘wiring’. I have created custom deserializers to do the conversion from JSON string to POJO. However, when the input is bad (eg. a number is passed as “124A” – illegal character) a default deserialiser is invoked and bombs with the NumberFormatException. Is there a way to prevent default converters from being called?

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  1. Editorial Team

    Ok, given that input is not valid JSON (numbers can not start with or contain ‘$’), deserializer will not be called, and any change would have to apply to parser. There are no switches in Jackson to allow such content to be considered numbers.

    If you can control input, just change value to a String (add double-quotes around value). Parser then passes it as JSON String, and data binding components get a chance to handle it (JsonDeserializer).

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