Unable to deserialize when using new Record classes

Question

I am trying to see if I can replace my existing Pojos with the new Record classes in Java 14. But unable to do so. Getting following error:

com.faste

Answer 1

The compiler generates the constructor and other accessor method for a Record.

In your case,

  public final class Post extends java.lang.Record {  
  public Post(int, int java.lang.String, java.lang.String);
  public java.lang.String toString();
  public final int hashCode();
  public final boolean equals(java.lang.Object);
  public int userId();
  public int id();
  public java.lang.String title();
  public java.lang.String body();
}

Here you can see that there is not default constructor which is needed got Jackson. The constructor you used is a compact constructor,

public Post {
 }

You can define a default/no args constructor as,

public record Post(int userId, int id, String title, String body) {
    public Post() {
        this(0,0, null, null);
    }
}

But Jackson uses Getter and Setters to set values. So in short, you can not use Record for mapping the response.