Jackson JSON converts integers into strings

Question

I am using the object mapper to map into an object that has String variables. This works a little too well, because even integers and booleans from the JSON are converted into Strings. Example:

{"my_variable":123}

class MyClass{
    String my_variable;
}

I would like the object mapper to report an error in this kind of situation instead of converting 123 into a string for my_variable. Is this possible?

Answer 1

There is currently no such configuration, but you can override default deserializer with a custom one (see fasterxml wiki) and make that throw an exception?

If you would like a more convenient way you can file a Jira enhancement request; for example, new DeserializationConfig.Feature.COERCE_STRINGS_AS_NUMBERS (default to true) that one could disable to prevent such coercion.