how to map generics collection with hibernate - spring

Question

i have a wrapper class with a list of generics
#Entity
public class Rubrique<T> {
...
#OneToMany(cascade = CascadeType.ALL, mappedBy = "declaration", fetch = FetchType.LAZY, orphanRemoval = true)
List<T> items = new ArrayList<T>();
...
i use it like that :
#Entity
public class Declar {
Rubrique<ActivConsultant> activConsultant = new Rubrique<ActivConsultant>();
public Rubrique<ActivConsultant> getActivConsultant() {
return activConsultant;
}
and here my Class ActivConsultant :
#Entity
public class ActivConsultant {
#ManyToOne
private Rubrique<?> rubrique;
...
but i can't map these entites with hibernate i have this error :
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Property fr.hatvp.parsatorApp.model.Rubrique.items has an unbound type and no explicit target entity. Resolve this Generic usage issue or set an explicit target attribute (eg #OneToMany(target=) or use an explicit #Type
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at fr.hatvp.parsatorApp.ParsatorApplication.main(ParsatorApplication.java:17) [classes/:na]
Caused by: org.hibernate.AnnotationException: Property fr.hatvp.parsatorApp.model.Rubrique.items has an unbound type and no explicit target entity. Resolve this Generic usage issue or set an explicit target attribute (eg #OneToMany(target=) or use an explicit #Type

Answer 1

You cannot use Generics with Hibernate how should Hibernate know which database table the List items should be mapped?
That's also exactly what the error message says:
Property fr.hatvp.parsatorApp.model.Rubrique.items has an unbound type
and no explicit target entity. Resolve this Generic usage issue or set
an explicit target attribute (eg #OneToMany(target=) or use an
explicit #Type