I'm running into a json parsing issue when using the ObjectMapper class from the com.fasterxml.jackson.databind package, and the error that I'm getting is:
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 where this problem is occurring is a Spring MVC application using an AngularJS front end, but I can duplicate the issue with a much smaller, all java program. Here are my beans:
Shipment.java
@JsonIgnoreProperties(ignoreUnknown = true) public class Shipment { @JsonProperty("Activity") private ArrayList<Activity> activity; public ArrayList<Activity> getActivity() { return activity; } public void setActivity(ArrayList<Activity> activity) { this.activity = activity; } } Activity.java
@JsonIgnoreProperties(ignoreUnknown = true) public class Activity { @JsonProperty("ActivityLocation") private ArrayList<ActivityLocation> activityLocation; public ArrayList<ActivityLocation> getActivityLocation() { return activityLocation; } public void setActivityLocation(ArrayList<ActivityLocation> activityLocation) { this.activityLocation = activityLocation; } } ActivityLocation.java
@JsonIgnoreProperties(ignoreUnknown = true) public class ActivityLocation { @JsonProperty("Address") private Address address; public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } } Address.java
@JsonIgnoreProperties(ignoreUnknown = true) public class Address { @JsonProperty("City") private String city; @JsonProperty("StateProvinceCode") private String stateProvinceCode; @JsonProperty("CountryCode") private String countryCode; public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getCountryCode() { return countryCode; } public void setCountryCode(String countryCode) { this.countryCode = countryCode; } public String getStateProvinceCode() { return stateProvinceCode; } public void setStateProvinceCode(String stateProvinceCode) { this.stateProvinceCode = stateProvinceCode; } } Here is the code where I can properly map the json:
public static void main(String[] args) { String jsonMessage = "" + "{" + " \"Activity\": [{ " + " \"ActivityLocation\": { " + " \"Address\": { " + " \"City\": \"Hana\", " + " \"StateProvinceCode\": \"Hi\", " + " \"CountryCode\": \"US\" " + " } " + " } " + " }, " + " { " + " \"ActivityLocation\": { " + " \"Address\": { " + " \"City\": \"Honolulu\", " + " \"StateProvinceCode\": \"Hi\", " + " \"CountryCode\": \"US\" " + " } " + " } " + " }] " + "} "; try { ObjectMapper mapper = new ObjectMapper(); mapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY); Shipment shipment = mapper.readValue(jsonMessage, Shipment.class); System.out.println("shipment.toString = " + shipment.toString()); } catch (Exception e) { e.printStackTrace(); } } When adjusting the data in the jsonMessage var is when I run into the error that I mentioned above:
"{" + " \"Activity\": [{ " + " \"ActivityLocation\": { " + " \"Address\": { " + " \"City\": \"Hana\", " + " \"StateProvinceCode\": \"Hi\", " + " \"CountryCode\": \"US\" " + " } " + " } " + " }, " + " { " + " \"ActivityLocation\": { " + " \"Address\": \"\" " + " } " + " } " + " }] " + "} "; So, the problem happens when changing the json from this:
{ "ActivityLocation": { "Address": { "City": "Honolulu", "StateProvinceCode": "Hi", "CountryCode": "US" } } }] to this:
{ "ActivityLocation": { "Address": "" } } Instead of sending values for my Address bean, I'm getting just an empty string. Unfortunately, I'm receiving my data from a third party and have no control over the data I receive.
Is there an annotation that needs to be added to be able to handle this?