public @interface JsonCreator

The constructor, or static factory method, that builds an immutable class from JSON.

A class with final fields and no constructor without arguments cannot be filled in field by field, so its JSON is read into one local per member and handed to this constructor at once – as a record’s canonical constructor is. Every parameter carries JsonProperty naming the member it is read from; a compiled class does not keep parameter names, so there is nothing else to match them by. A member a body leaves out arrives as its type’s default (null, 0, false) unless it is required.

@Mapped
public final class Point {
    private final int x;
    private final int y;

    @JsonCreator
    public Point(@JsonProperty("x") int x, @JsonProperty("y") int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() { return x; }
    public int getY() { return y; }
}

The generated code calls it directly; nothing is looked up by name.