import lombok.AccessLevel;
import lombok.NonNull;
import lombok.experimental.Wither;

public class WitherExample {
	@Wither private final int age;
	@Wither(AccessLevel.PROTECTED) @NonNull private final String name;
	
	public WitherExample(String name, int age) {
		if (name == null) throw new NullPointerException();
		this.name = name;
		this.age = age;
	}
}