[FIXED] Spring MVC and the @Data annotation

Issue

• I am using SpringToolSuite as IDE and developing using Spring MVC.

• In the model part of my application I am defining a bean called Ingredient

import lombok.Data;

@Data
public class Ingredient {
    
    public Ingredient(String string, String string2, Type wrap) {
        // TODO Auto-generated constructor stub
    }
    private String id;
    private String name;
    private Type type;
    public enum Type{
        WRAP, PROTEIN, VEGGIES, CHEESE, SAUCE
    }

}

• As I am using the @Data annotation from Lombok I can suppose that a constructor taking the 3 attributes is automatically created as well as getter and setters.

• But as in the controller I call new Ingredient("FLTO", "Flour Tortilla", Type.WRAP) I get a redline under the instruction with a message that tells me that there is no constructor with the parameters in question.

  • I don't understand because the class Ingredient is marked with the Lombok's annotation @Data

• The errors cause the running of the SpringBoot's project to crash

Caused by: java.lang.Error: Unresolved compilation problems: 
    The method asList(T...) in the type Arrays is not applicable for the arguments (Ingredient, Ingredient, Ingredient, Ingredient, Ingredient, Ingredient, Ingredient, Ingredient, Ingredient, Ingredient)
    The constructor Ingredient(String, String, Ingredient.Type) is undefined
.........................

Solution

@Data documentation

Equivalent to @Getter @Setter @RequiredArgsConstructor @ToString @EqualsAndHashCode.

As your fields are not marked as final they are not covered by the @RequiredArgsConstructor

Therefor

1. Declare the required fields as final or
2. Use @AllArgsConstructor

Edit

@Data
public class Ingredient {
    private final String id;
    private final String name;
    private final Type type;
    public enum Type{
        WRAP, PROTEIN, VEGGIES, CHEESE, SAUCE
    }

}

gets delomoked to:

@Data
public class Ingredient {
    private final String id;
    private final String name;
    private final Type type;

    @java.beans.ConstructorProperties({"id", "name", "type"})
    public Ingredient(String id, String name, Type type) {
        this.id = id;
        this.name = name;
        this.type = type;
    }
....
}

And then I can use

 Ingredient test = new Ingredient("id", "name", Ingredient.Type.CHEESE);

Answered By - Daniel Wosch
Answer Checked By - Pedro (JavaFixing Volunteer)