IllegalArgumentException：＆＃34; Object＆＃34;不是已知的实体类型

Question

所以，我正在使用JPA（Glassfish Server 4.1.2）在JAVA EE中完成一个项目。 但是当我坚持使用我的Facade时出现了这个错误：

void Game::tick(){
    (this->*(button1->click))();
}

这是我的档案：

Controller（IndexBean）：

Caused by: java.lang.IllegalArgumentException: Object: be.isl.prj.story.entity.Universe@3b28b3d6 is not a known Entity type.

AbstractFacade：

package be.usl.prj.story.controller;

import be.isl.prj.story.dao.UniverseFacade;
import be.isl.prj.story.entity.Universe;
import java.io.Serializable;
import java.util.ArrayList;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.inject.Inject;

/**
 * IndexController
 */
@ManagedBean
@RequestScoped
public class IndexBean implements Serializable{
    ArrayList<String> list = new ArrayList<String>();
    private String test;

    @Inject
    private UniverseFacade universeFacade;

    @PostConstruct
    private void init(){

    }

    public IndexBean() {
    }

    public void doTest(){
        Universe universe = new Universe("YEAH", "REallyNew gen");
        /*
        // this works :
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("StoryGeneratorPU");
        EntityManager entityManager = emf.createEntityManager();
        entityManager.persist(universe);
        */
        this.universeFacade.create(universe);
        //System.out.println(this.universeFacade.find(139).getName());
    }
}

UniverseFacade：

package be.isl.prj.story.dao;

import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;

public abstract class AbstractFacade<T> {
    private Class<T> entityClass;
    @PersistenceContext(unitName="StoryGeneratorPU")
    protected EntityManager entityManager;

    public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("StoryGeneratorPU");
        this.entityManager = emf.createEntityManager();
    }

    public void create(T entity) {
        entityManager.persist(entity);
    }

    public void edit(T entity) {
        entityManager.merge(entity);
    }

    public void remove(T entity) {
        entityManager.remove(entityManager.merge(entity));
    }

    public T find(Object id) {
        T object = entityManager.find(entityClass, id);
        return object;
    }

    public List<T> findAll() {
        javax.persistence.criteria.CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        List list = entityManager.createQuery(cq).getResultList();
        return list;
    }

    public List<T> findRange(int[] range) {
        javax.persistence.criteria.CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        javax.persistence.Query q = entityManager.createQuery(cq);
        q.setMaxResults(range[1] - range[0] + 1);
        q.setFirstResult(range[0]);
        List list = q.getResultList();
        return list;
    }

    public int count() {
        javax.persistence.criteria.CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery();
        javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
        cq.select(entityManager.getCriteriaBuilder().count(rt));
        javax.persistence.Query q = entityManager.createQuery(cq);
        int count = ((Long) q.getSingleResult()).intValue();
        return count;
    }
}

宇宙实体：

package be.isl.prj.story.dao;

import be.isl.prj.story.entity.Universe;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;

@Stateless
public class UniverseFacade extends AbstractFacade<Universe>{
    public UniverseFacade() {
        super(Universe.class);
    }

    public EntityManager getEntityManager(){
        return this.entityManager;
    }
}

Persistence.xml：

package be.isl.prj.story.entity;

import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Entity
@Table(name = "universe")
public class Universe implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO, generator="universe_id_seq")
    @SequenceGenerator(name="universe_id_seq", sequenceName="universe_id_seq", allocationSize=1)
    @Column( name = "id_universe" )
    private int idUniverse;
    @Column( name = "name" )
    protected String name;
    @Column( name = "content" )
    protected String content;

    // ALTER SEQUENCE universe_id_universe_seq RENAME TO universe_id_seq;

    public Universe() {

    }

    public Universe(int idUniverse, String name, String content) {
        this.setIdUniverse(idUniverse);
        this.setName(name);
        this.setContent(content);
    }

    public Universe(String name, String content) {
        this.setName(name);
        this.setContent(content);
    }

    public int getIdUniverse() {
        return idUniverse;
    }

    public void setIdUniverse(int idUniverse) {
        this.idUniverse = idUniverse;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }  

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    } 
}

最后是堆栈跟踪：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="StoryGeneratorPU" transaction-type="JTA">
      <class>be.isl.prj.story.entity.Universe</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

感谢您的回答。