Question

我在制作网络应用程序时遇到了麻烦。我使用的是Red Hat JBoss Developer Studio 8.1.0.GA，部署时遇到错误。

java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/hibernatedb

这是我的persistence.xml

<persistence-unit name="HibernateProject"
    transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>

    <class>com.test.model.UserDetails</class>
    <properties>
        <property name="hibernate.connection.driver.class" value="org.postgresql.Driver"></property>
        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.hbm2ddl.auto" value="validate" />
        <property name="hibernate.connection.url"
            value="jdbc:postgresql://localhost:5432/hibernatedb"></property>
        <property name="hibernate.connection.username" value="postgres"></property>
        <property name="hibernate.connection.password" value="1234"></property>
    </properties>
</persistence-unit>

这是我的servlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    UserDetails user = new UserDetails();
    user.setUserName(request.getParameter("username"));

    //use persistence-unit name from persistence.xml
    EntityManagerFactory entityFactory = Persistence.createEntityManagerFactory("HibernateProject");

    EntityManager entityManager = entityFactory.createEntityManager();

    EntityTransaction entityTransaction = null;

    try{
        entityTransaction = entityManager.getTransaction();
        entityTransaction.begin();
        entityManager.persist(user);
        entityTransaction.commit();
    }catch(RuntimeException re){
        if(entityTransaction.isActive()){
            entityTransaction.rollback();
            throw re;
        }
    }

}

非常感谢！

Answer 1

将此添加到servlet初始化：

JDBC驱动程序在其类静态初始化程序中自行注册，调用上面的代码会导致加载类并执行静态初始化。您只需在应用程序启动时调用一次。

另请参阅Postgre JDBC文档：https://jdbc.postgresql.org/documentation/head/load.html

JBDS HHH000319：无法获取数据库元数据：java.sql.SQLException：找不到合适的驱动程序

1 个答案: