Question

我正在尝试向我的EJB注入带有@PersistenceContext注释的EntityManager，但我一直在获取NULL EntityManager

我做错了什么？

server：websphere 7.0.0.0
提供者：openjpa
ejb：2.0

从struts行动中调用ejb

这是我的代码:(问题出在我帖子的bootom中的TaPaymentInfoBean.java类中）

的persistence.xml：

<persistence version="1.0" 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_1_0.xsd">

        <persistence-unit name="BookingUnit" transaction-type="JTA">

            <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
            <jta-data-source>jdbc/payment</jta-data-source>
            <class>dataobjects.PaymentInfo</class>
            <class>dataobjects.PaymentRequest</class>
            <class>dataobjects.Address</class>
            <properties>
              <property name="openjpa.Log" value="DefaultLevel=TRACE, Runtime=TRACE, Tool=TRACE, SQL=TRACE"/>
              <property name="openjpa.TransactionMode" value="managed"/>
            </properties>
            <
        </persistence-unit>
       </persistence>

战争方面：

EJBdelegate.java

public PaymentInfoContainer getAllPaymentInfo(PaymentInfoSearch paymentInfoSearch) throws RemoteException, SQLException {
        try {   
                ParamLookupManagerHome paramLookupHome = (ParamLookupManagerHome) EJBHomeFactory.getInstance().lookupHome("java:comp/env/paramLookupManagerNEWADMIN", ParamLookupManagerHome.class, true);
                ParamLookupManager param = paramLookupHome.create();            
                return param.getAllPaymentInfo(paymentInfoSearch);
            } catch (RemoteException e) {
                e.printStackTrace();
                return null;
            }
    }

EJB方面：

EJB-jar.xml中：

<session id="ParamLookupManager">
            <ejb-name>ParamLookupManager</ejb-name>
            <home>beans.ParamLookupManagerHome</home>
            <remote>beans.ParamLookupManager</remote>
            <ejb-class>beans.ParamLookupManagerBean</ejb-class>
            <session-type>Stateless</session-type>
            <transaction-type>Container</transaction-type>

<ejb-ref id="EjbRef_1111111111">
                <ejb-ref-name>ejb/TaPaymentInfo</ejb-ref-name>
                <ejb-ref-type>Session</ejb-ref-type>
                <home>beans.TaPaymentInfoHome</home>
                <remote>beans.TaPaymentInfo</remote>
                <ejb-link>TaPaymentInfo</ejb-link>
</ejb-ref>
</session>

<session id="TaPaymentInfo">
            <ejb-name>TaPaymentInfo</ejb-name>
            <home>beans.TaPaymentInfoHome</home>
            <remote>beans.TaPaymentInfo</remote>
            <ejb-class>beans.TaPaymentInfoBean</ejb-class>
            <session-type>Stateless</session-type>
            <transaction-type>Container</transaction-type>
        </session>
        <assembly-descriptor>
        <container-transaction>
            <method>
                <ejb-name>TaPaymentInfo</ejb-name>
                <method-intf>Remote</method-intf>
                <method-name>*</method-name>
            </method>
            <trans-attribute>Required</trans-attribute>
        </container-transaction>
    </assembly-descriptor>

ParamLookupManager.java：

 public interface ParamLookupManager extends javax.ejb.EJBObject {

    public PaymentInfoContainer getAllPaymentInfo(PaymentInfoSearch paymentInfoSearch)   throws RemoteException, SQLException;

}

ParamLookupManagerHome.java：

public interface ParamLookupManagerHome extends javax.ejb.EJBHome {
    public beans.ParamLookupManager create()
        throws javax.ejb.CreateException, java.rmi.RemoteException;
}

ParamLookupManagerBean.java：

public class ParamLookupManagerBean implements javax.ejb.SessionBean {
        public PaymentInfoContainer getAllPaymentInfo(PaymentInfoSearch paymentInfoSearch) throws SQLException {
                    TaPaymentInfoHome taPaymentInfoHome = (TaPaymentInfoHome)TAHomeFactory.getInstance().getEJBHome(TAHomeFactory.TAPAYMENTINFO_HOME_NAME);
                    TaPaymentInfo taPaymentInfo = taPaymentInfoHome.create();
                    PaymentInfoContainer lst = taPaymentInfo.getAllPaymentInfo(paymentInfoSearch);
                    return lst;
            }
    }

TaPaymentInfo.java：

 public interface TaPaymentInfo extends javax.ejb.EJBObject {
        public PaymentInfoContainer getAllPaymentInfo(PaymentInfoSearch paymentInfoSearch) throws RemoteException;
    }

TaPaymentInfoHome.java：

public interface TaPaymentInfoHome extends javax.ejb.EJBHome {
    public beans.TaPaymentInfo create()
        throws javax.ejb.CreateException, java.rmi.RemoteException;
    }

TaPaymentInfoBean :(其中EntityManager为空）

public class TaPaymentInfoBean implements javax.ejb.SessionBean {
 @PersistenceContext(unitName="BookingUnit")
 private EntityManager em;
}

public PaymentInfoContainer getAllPaymentInfo(PaymentInfoSearch paymentInfoSearch){
    em.find(PaymentInfo.class, paymentInfoSearch.getKey);
}

我的服务器日志看起来很好，没有错误，当我尝试这个代码时，它工作得很好

EntityManagerFactory emf = Persistence.createEntityManagerFactory("BookingUnit");
em = emf.createEntityManager();

但注射也需要起作用。

Answer 1

<ejb-jar version="2.0">不支持注入和持久性context-ref。尝试使用3.0这样的东西：

<?xml version="1.0"?>
<ejb-jar
  xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
  version="3.0"
>
  <enterprise-beans>
    ...
  </enterprise-beans>
</ejb-jar>

无法在websphere中注入EntityManager

1 个答案: