EntityManager没有注入无状态会话Bean与@PersistenceContext

我一直在寻找很多类似的问题，这些问题并没有反映我的确切问题。如果我忽视了某人已经解决了这个问题，请告诉我。EntityManager没有注入无状态会话Bean与@PersistenceContext

我目前正在将旧的EJB CMP bean迁移到Wildfly 10.1上的JPA。这里的问题是我的无状态会话bean中的entitymanager没有注入@PersistenceContext，EntityManager留空。我试着用EntityManagerFactory解决这个问题。

封闭的是服务器端的persistence.xml，EJB2 Session Bean代码。

请帮忙。

public class CAAFAdminServiceBean implements SessionBean { 
     @PersistenceContext(unitName = "PFJPAEMJTA") 
      private EntityManager em1; 
      // For some reason, em1 is not initialized by EJB container though this is Session bean, ideally it should be. 
      // Hence calling getEntityManager() to create EntityManager from its Factory. 
      private EntityManager em = null; 

     public void ejbCreate() { 
     em = getEntityManager(); 
     // Set same object in the Util class so that same can be referenced anywhere. 
       CAAFEntityUtil.setEntityManager(em); 
     } 

     private EntityManager getEntityManager() { 
       if (em1 == null) { 
        if (em == null) { 
         PerfLog perflog = new PerfLog(new PerfLogEJBCalledCategory(this.getClass(), "getEntityManager")); 
         String status = PerfLog.FAIL; 
         try { 
          EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("PFJPAEMJTA"); 
          em1 = em = entityManagerFactory.createEntityManager(); 
          status = PerfLog.SUCCESS; 
          return em; 
         } finally { 
          perflog.end(status); 
         } 
        } 
        return em; 
       } 
       System.out.println("************EntityManager object is injected by EJB container, great to see that!!!************"); 
       return em1; 
      } 

     } 


<?xml version="1.0" encoding="UTF-8"?> 
    <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> 
     <persistence-unit name="PFJPAEMJTA" transaction-type="JTA"> 
      <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> 
      <jta-data-source>java:jboss/jdbc/PF_TX_DATASOURCE</jta-data-source> 
      <class>com.entity.rdbms.RDBMSComponentBean</class> 
      <properties> 
       <property name="showSql" value="true"/> 
       <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" /> 
       <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform" /> 
      </properties> 
     </persistence-unit> 
    </persistence>

来源

2017-09-29 Srini

可以注入EntityManagerFactory吗？ –

你的项目结构是什么？你在哪里放置persistence.xml？ – empyros

EJB 2会话bean不支持注入。考虑将其转换为“现代” EJB（假设它被宣布在现有的ejb-jar.xml中Stateless）：

@Stateless 
public class CAAFAdminServiceBean { 

    @PersistenceContext(unitName = "PFJPAEMJTA") 
    private EntityManager em; 

    @PostConstruct 
    public void formerEjbCreate() { 
     CAAFEntityUtil.setEntityManager(em); 
    } 

    public void someBusinessMethod(MyEntity myEntity) { 
     em.persist(myEntity); 
     ... 
    } 

    ... 
}

，并删除任何提及它在ejb-jar.xml文件。

考虑删除CAAFEntityUtil，因为您应该能够在任何地方注入EntityManager，因为您也有CDI支持。

来源

2017-10-01 12:04:58

EntityManager没有注入无状态会话Bean与@PersistenceContext

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