Question

调用Webservice时出现以下错误：

org.apache.openjpa.persistence.ArgumentException: A JDBC Driver or DataSource class name must be specified in the ConnectionDriverName property.

Webservice类基本上尝试使用JPA来插入数据，并且基于上面的错误消息，似乎EntityManager无法访问数据源条目，如下所示：

<persistence-unit name="TEST_P" transaction-type="RESOURCE_LOCAL"> 
        <provider>
        com.ibm.websphere.persistence.PersistenceProviderImpl
        </provider>
        <non-jta-data-source>java:comp/env/jdbc/DATA</non-jta-data-source>
        <class>jpa.WSTGHandler</class>
            <properties>

        </properties>
    </persistence-unit>

我还在web.xml中定义了数据源条目，如下所示：

      <resource-ref>
        <res-ref-name>java:comp/env/jdbc/DATA</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
        <res-sharing-scope>Shareable</res-sharing-scope>
    </resource-ref>

在In Servlet中嵌入JPA代码可以极大地定位数据源。如何让Webservice以相同的方式工作？

PS：我使用的是Websphere 7，JPA 1.2版和JAX-WS

根据要求，在Web服务方法中调用以下类，即beginTransaction（）

public class EntityManagerHelper {

    private static final EntityManagerFactory emf; 
    private static final ThreadLocal<EntityManager> threadLocal;
    private static final Logger logger;

    static {
        emf = Persistence.createEntityManagerFactory("TEST_P");         
        threadLocal = new ThreadLocal<EntityManager>();
        logger = Logger.getLogger("TEST_P");
        logger.setLevel(Level.FINE);
    }

    public static EntityManager getEntityManager() {
        EntityManager manager = threadLocal.get();      
        if (manager == null || !manager.isOpen()) {
            manager = emf.createEntityManager();
            threadLocal.set(manager);
        }
        return manager;
    }

     public static void closeEntityManager() {
        EntityManager em = threadLocal.get();
        threadLocal.set(null);
        if (em != null) em.close();
    }

    public static void beginTransaction() {
        getEntityManager().getTransaction().begin();
    }

    public static void commit() {
        getEntityManager().getTransaction().commit();
    }  

    public static void rollback() {
        getEntityManager().getTransaction().rollback();
    } 

    public static Query createQuery(String query) {
        return getEntityManager().createQuery(query);
    }

    public static void log(String info, Level level, Throwable ex) {
        logger.log(level, info, ex);
    }

}

Answer 1

问题已解决。这只是res-ref-name中的一个错字：）

如何通过Webservice查找非jta-data-source / jta-data-source

1 个答案: