Question

我正在使用Hibernate 3.3和使用Oracle 11g开发Struts 2 Framework。我的网络项目自5个月以来一直运作良好。但最近我面临java.sql.SQLRecoverableException：在一些空闲时间内关闭连接。我将解释下面的情景.. 我的hibernate.cfg.xml配置是

<property name="hibernate.current_session_context_class">
        thread
    </propert
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="connection.username">user</property>
<property name="connection.password">user</property>
<property name="connection.driver_class">
        oracle.jdbc.OracleDriver
    </property>
<property name="myeclipse.connection.profile">Oracle</property>
<property name="hibernate.connection.autoReconnect">true</property>
<property name="dialect"> org.hibernate.dialect.Oracle10gDialect </property>

我的HibernateSessionFactory conf是

private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static Configuration configuration = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;
private static String configFile = CONFIG_FILE_LOCATION;
static {
    try {
        configuration.configure(configFile);
        sessionFactory = configuration.buildSessionFactory();
    } catch (Exception e) {
        System.err
                .println("%%%% Error Creating SessionFactory %%%%");
        //e.printStackTrace();
    }
}
private HibernateSessionFactory() {
}
public static Session getSession() throws HibernateException {
    Session session = (Session) threadLocal.get();

    if (session == null || !session.isOpen()) {
        if (sessionFactory == null) {
            rebuildSessionFactory();
        }
        session = (sessionFactory != null) ? sessionFactory.openSession()
                : null;
        threadLocal.set(session);
    }

    return session;
}
public static void rebuildSessionFactory() {
    try {
        configuration.configure(configFile);
        sessionFactory = configuration.buildSessionFactory();
    } catch (Exception e) {
        System.err
                .println("%%%% Error Creating SessionFactory %%%%");
        //e.printStackTrace();
    }
}
public static void closeSession() throws HibernateException {
    Session session = (Session) threadLocal.get();
    threadLocal.set(null);

    if (session != null) {
        session.close();
    }
}
public static org.hibernate.SessionFactory getSessionFactory() {
    return sessionFactory;
}
public static void setConfigFile(String configFile) {
    HibernateSessionFactory.configFile = configFile;
    sessionFactory = null;
}
public static Configuration getConfiguration() {
    return configuration;
}

然后在以下代码运行时出现错误

session = HibernateSessionFactory.getSession();
Query query = session.createQuery(SQL_QUERY);
try {
                // session.connection().close();
                System.out.println("CLOSED :"
                        + session.connection().isClosed());
                if (session.connection().isClosed()) {
                    System.out.println("RECONNECTING.......");
                    session.reconnect();
                }
                System.out.println("CLOSED :"
                        + session.connection().isClosed());
            } catch (Exception e1) {

                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
try {
for (Iterator it = query.iterate(); it.hasNext();) {
                    chk = true;
                    ur = (EmagEnterpriseLogin) it.next();
} catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

当上述代码段运行时，即使能够打开会话并成功创建查询，但在迭代查询时失败。第一次来了

Caused By:java.sql.SQLRecoverableException: Closed Connection

但是在第一次尝试之前我犯了这个错误，我抓住了session.Connection.isClosed（）是假的。但是在第一次出现错误之后，继续作为SQL State = null，从第二次起，我可以得到session.Connection.isClosed（）为真。然后重新连接执行但仍然重复相同的错误。我也尝试重建sessionfactory，这也失败了。请帮我解决这个问题。

Answer 1

最后我发现我的问题的解决方案是使用第三方连接提供程序而不是使用Hibernate Native连接提供程序。我使用了c3p0连接提供程序，这也给了我一些问题，我也解决了这个问题。 c3p0的参考链接在这里.. Hibernate c3p0 Connection NewPooledConnection close Exception

java.sql.SQLRecoverableException：已关闭的连接

1 个答案: