@Entity
@Data
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="type",discriminatorType = DiscriminatorType.STRING)
public abstract class Question {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String text;
    @OneToMany(mappedBy = "question")
    private List<Answer> answerList;
    @Enumerated(EnumType.STRING)
    private Difficult difficult;

}

@Data
@Entity
@DiscriminatorValue("OOP")
public class QuestionOOP extends Question {

}

@Repository
 public interface QuestionRepo extends JpaRepository<Question,Long> {
List<Question> findAllByType(String t);
}

Failed to create query for method public abstract java.util.List com.alekseev.Javatesting.Repository.QuestionRepo.findAllByType(java.lang.String)! No property type found for type Question!
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]

    @Column (insertable = false, updatable = false)
    private String type;

    @Column (insertable = false, updatable = false)
    private String type;

  @Column (insertable = false, updatable = false)
    private String type;

<#list type as types>
<div>
    <input type="radio" name="${types}" id="${types}"><label>${types}</label>
</div>
</#list>