How to enable 'ALLOW_NUMERIC_LEADING_ZEROS' feature to allow leading zeroes in JSON Request Body?

Question

As per JSON specification, I am aware that leading zeroes are not allowed in integers in JSON. But as per Jackson documentation, there is a property in Jackson library i.e.

Answer 1

Just a note for people that are having that issue and are looking for a newer working solution:

1. Import latest version of fasterxml jackson in maven (2.11.0 as of today):

   com.fasterxml.jackson.dataformat jackson-dataformat-xml 2.11.0

2. Create the mapper object:

   ObjectMapper objectMapper = new ObjectMapper();

3. Allow the leading zeros for numbers (the not deprecated version):

   objectMapper.enable(JsonReadFeature.ALLOW_LEADING_ZEROS_FOR_NUMBERS.mappedFeature());

used imports:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.json.JsonReadFeature;

Keep in mind this will trim the leading 0s. If you want to keep them then your json value shouldn't be a numeric.