Java语言sql。SQLRecoverableException：关闭的连接

Question

我正在使用Hibernate 3.3和Oracle 11g开发Struts 2 Framework。我的Web项目自5个月以来一直运行良好。但是最近我面临着java.sql.SQLRecoverableException：在一些空闲时间关闭连接。我将解释以下场景...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配置是

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;
}

然后在运行以下代码时出错

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();
            }

当上面的代码段运行时，即使已成功打开并创建了able to session查询，但在迭代查询时失败。第一次作为

Caused By:java.sql.SQLRecoverableException: Closed Connection

但是在第一次尝试中出现这个错误之前，我捕获了会话。Connection.isClosed（）是错误的。但是在第一次错误之后，SQLState=null继续出现，从第二次开始，我可以得到会话。Connection.isClosed（）是正确的。然后重新连接执行，但仍然重复相同的错误。我还尝试重建sesionFactory，但也失败了。请帮助我解决这个问题。

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，这也给我带来了一些问题，我也解决了。c3p0的参考链接在这里... Hibernate c3p0 Connection NewPooledConnection关闭异常