Home/ Questions/How to address: no string argument constructor factory method to deserialize from string value
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rauclint
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Asked: 2022-04-30T08:48:26+00:00 In:

How to address: no string argument constructor factory method to deserialize from string value

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I get the error as follow when I tried to run into a json parsing issue and use the class of  ObjectMapper from the package of com.fasterxml.jackson.databind

com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of com.graybar.utilities.ups.beans.Address: no String-argument constructor/factory method to deserialize from String value (”) 

The web application on which this issue is happening is one that is a Spring MVC application with an AngularJS front-end. However, I’ve been able to reproduce the issue using a smaller, all-java application. Below are the beans I used: Shipment.java; Activity.java; ActivityLocation.java; Address.java  The code to map the json get back and when adjusting the jsonMessage var data. But, the problem occurs when adjusting the json, it is from:

{
    "ActivityLocation": { 
        "Address": {
            "City": "Honolulu", 
            "StateProvinceCode": "Hi", 
            "CountryCode": "US"
        }
    }
}]

to

{
"ActivityLocation": {
     "Address": ""
    }
}

help me to solve this problem, thanks

javastring
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2 Answers

  1. Best Answer

    To address: no string argument constructor factory method to deserialize from string value, it also depend of the Jackson version in your system but just try this way:

    mapper.configure(
          DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT,
          true)

    and other solution:

    mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
    • 12

  2. I think you just check the corect solution to call it. This happened when calling this:

    mapper.convertValue(...)

    instead,

    mapper.readValue(...)

     

    • 7

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