Pfthb

I'm trying to get Jackson to deserialize

 "test": 2018

to

SomeJavaClass:
 private final Test test

But I want to make my Test class using Project Lombok. However Lombok annotates the class with ConstructorProperties, and for some reason this makes jackson fail.

My classes looks like this:

@Value
public class SomeJavaClass 
 Test test;



@Value
public class Test
 String value;

Test is delomboked as:

public class Test 
 int value;

 @java.beans.ConstructorProperties("value")
 public Test(final int value) 
 this.value = value;
 

 public int getValue() 
 return this.value;
 

 public boolean equals(final Object o) 
 if (o == this) 
 return true;
 
 if (!(o instanceof Test)) 
 return false;
 
 final Test other = (Test) o;
 if (this.getValue() != other.getValue()) 
 return false;
 
 return true;
 

 public int hashCode() 
 final int PRIME = 59;
 int result = 1;
 result = result * PRIME + this.getValue();
 return result;
 

 public String toString() 
 return "Test(value=" + this.getValue() + ")";
 

Is it possible to make Jackson ignore the constructorproperties somehow?

I also think that the problem here is not the annotation @java.beans.ConstructorProperties("value").

Based on your delombok it seems that you have a set of annotations that will prevent default constructor to form.

So maybe you get rid of this problem by adding @NoArgsConstructor. Without default constructor and having no @JsonCreators you will have an error like:

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot
construct instance of org.example.spring.jackson.JacksonTest$TestClass
(although at least one Creator exists): cannot deserialize from Object
value (no delegate- or property-based Creator)

The reason why this fails is not the @ConstructorProperties. In fact, this annotation is required to make Jackson work with Lombok's @AllArgsConstructor.

The problem here is that the value of test in your JSON is an integer, but your class structure requires it to be an object. So you have to make the field test in SomeJavaClass an int. Then you also don't need the Test class. (Or rename value to test in Test and get rid of SomeJavaClass and deserialize to Test.)