Question

我花了相当多的时间研究并试图弄清楚我的配置出了什么问题，但我完全卡住了。从帖子我一直在读的暗示是我的驱动程序不在类路径中。我添加了Class.forName（“com.ibm.db2.jcc.DB2Driver”）行以确保驱动程序可用并在该行中加载。我真的很感激任何关于我可能错过的建议。

我的代码是：

    public class TestHibernateConfig {

    private static SessionFactory sessionFactory;

    public static void testConfig() {
        try {
            DB2Driver drvr = (DB2Driver) Class.forName("com.ibm.db2.jcc.DB2Driver").newInstance();

            Configuration cfg = new Configuration();
            cfg.configure("hibernate.cfg.xml");
            sessionFactory = cfg.buildSessionFactory();
            Session sess = sessionFactory.getCurrentSession();
            Transaction tx = sess.beginTransaction();

            Criteria crit = sess.createCriteria(ItemData.class);
            List items = crit.list();

        } catch (Exception e) {
            Logger logger = Logger.getLogger("");
            logger.error(e.getMessage());
        }
    }
}

当我的代码命中时，我收到了类找不到错误： sessionFactory = cfg.buildSessionFactory（）;

的hibernate.cfg.xml

    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 <session-factory name="speed2db2">
 <property name="hibernate.dialect">org.hibernate.dialect.DB2Dialect</property>
  <property name="hibernate.connection.driver_class">com.ibm.db2.jcc.DB2Driver</property>
  <property name="hibernate.connection.url">jdbc:db2://appdb:50000/MYTEST</property>
  <property name="hibernate.connection.username">myUser</property>
  <property name="hibernate.connection.password">myPass</property>
 </session-factory>
</hibernate-configuration>

的persistence.xml

<?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="speedPersistUnit">
        <class>ItemData</class>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.DB2Dialect"/>
            <property name="hibernate.connection.url" value="jdbc:db2://appdb:50000/MYTEST"/>
            <property name="hibernate.default_schema" value="MYSCHEMA"/>
            <property name="hibernate.connection.username" value="myUser"/>
            <property name="hibernate.connection.password" value="myPass"/>
            <property name="hibernate.connection.driver_class" value="com.ibm.db2.jcc.DB2Driver"/>
        </properties>
    </persistence-unit>
</persistence>

从Eclipse中我可以连接到数据库，如果我转到Hibernate透视图，我就可以浏览数据库模式。我也可以使用HQL编辑器在我的课程中加载数据。

编辑：

09:35:50,338 INFO  [org.hibernate.cfg.Configuration] (http-xxxxxx-xx.xx.xx.xxxx-15081-1) HHH000043: Configuring from resource: /com/newpig/speed2DB2/hibernate.cfg.xml
09:35:50,340 INFO  [org.hibernate.cfg.Configuration] (http-xxxxxx-xx.xx.xx.xxxx-15081-1) HHH000040: Configuration resource: /com/newpig/speed2DB2/hibernate.cfg.xml
09:35:50,369 INFO  [org.hibernate.cfg.Configuration] (http-xxxxxx-xx.xx.xx.xxxx-15081-1) HHH000041: Configured SessionFactory: speed2db2
09:35:52,059 INFO  [org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl] (http-xxxxxx-xx.xx.xx.xxxx-15081-1) HHH000402: Using Hibernate built-in connection pool (not for production use!)
09:36:16,856 ERROR [] (http-xxxxxx-xx.xx.xx.xxxx-15081-1) Specified JDBC Driver com.ibm.db2.jcc.DB2Driver class not found

此行发生错误。

 sessionFactory = cfg.buildSessionFactory();

部署到我的.war文件：
.WAR
| -WEB-INF
|| -lib
||| -db2jcc4.jar
||| -HIBERNATE核心，4.1.2.Final.jar
||| -HIBERNATE-的EntityManager，4.1.2.Final.jar
||| -HIBERNATE-JPA-2.0-API-1.0.1.Final.jar

Answer 1

我不认为我提到过我正在使用JBoss7.1。最后，我无法弄清楚为什么Hibernate无法加载驱动程序但是通过切换到使用JNDI并在JBoss standalone.xml中配置数据源而不是尝试从Hibernate建立连接来解决它。

Answer 2

我认为可能是因为hibernate.cfg.xml位置错误。您应该检查它是否在类路径中，或者您可以尝试在方法调用中添加类路径。

SessionFactory sessionFactory = new Configuration().configure(
                    "/com/mkyong/persistence/hibernate.cfg.xml")
                    .buildSessionFactory();

未找到指定的JDBC驱动程序com.ibm.db2.jcc.DB2Driver类

2 个答案: