Cannot declare List property in the JPA @Entity class. It says 'Basic' attribute type should not be a container

Question

I have a JPA @Entity class Place, with some properties holding some information about a place, such as name of place, description, and URLs of some images.

For the URLs of images, I declare a List<Link> in my entity.

However, I am getting this error:

Basic attribute type should not be a container.

I tried to remove @Basic, but the error message is still there. Why does it shows this error?

Answer 1

You are most likely missing a relational (like @OneToMany) annotation and/or @Entity annotation.

I had a same problem in:

@Entity public class SomeFee {     @Id     private Long id;     private List<AdditionalFee> additionalFees;     //other fields, getters, setters.. }  class AdditionalFee {     @Id     private int id;     //other fields, getters, setters.. } 

additionalFees was the field causing the problem.

What I was missing and what helped me are the following:

1. @Entity annotation on the Generic Type argument (AdditionalFee) class;
2. @OneToMany (or any other type of appropriate relation fitting your case) annotation on the private List<AdditionalFee> additionalFees; field.

So, the working version looked like this:

@Entity public class SomeFee {     @Id     private Long id;     @OneToMany     private List<AdditionalFee> additionalFees;     //other fields, getters, setters.. }      @Entity class AdditionalFee {     @Id     private int id;     //other fields, getters, setters.. } 

Answer 2

You can also use @ElementCollection:

@ElementCollection private List<String> tags;