连接因超时关闭后休眠无法重新连接到mysql

【问题标题】：hibernate couldn't reconnect to mysql after connection closed by timeout连接因超时关闭后休眠无法重新连接到mysql
【发布时间】：2012-03-01 09:00:35
【问题描述】：

我有一个 java 应用程序，我想创建池连接。我在 Jboss AS 7.0.2 上使用 Hibernate 4.0_final 和 c3p0、MySQL

hibernate.cfg.xml：

<hibernate-configuration>
 <session-factory >
  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.connection.password"></property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
  <property name="hibernate.show_sql">true</property>

  <property name="hibernate.c3p0.acquire_increment">1</property>
  <property name="hibernate.c3p0.idle_test_period">100</property>
  <property name="hibernate.c3p0.max_size">100</property>
  <property name="hibernate.c3p0.max_statements">0</property>
  <property name="hibernate.c3p0.min_size">5</property>
  <property name="hibernate.c3p0.timeout">30</property>
 <!--  <property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property> -->

  <mapping class="com.test.Test"/>

c3p0.properties：

c3p0.testConnectionOnCheckout=true
c3p0.acquireRetryDelay=1000
c3p0.acquireRetryAttempts=1

我从中获得会话的班级，用于使用数据库

public class HibernateSessionFactory {

    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private  static org.hibernate.cfg.Configuration configuration = new org.hibernate.cfg.AnnotationConfiguration();    
    private static org.hibernate.SessionFactory sessionFactory;
    private static String configFile = CONFIG_FILE_LOCATION;

    static {
        rebuildSessionFactory();
    }

    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) {
            e.printStackTrace();
        }
    }
}

创建 SessionFactory 后，我在 MySQL_WorkBench 中看到到我的数据库的 5 个连接。之后我发送请求并等待 50 秒（MySql_Server 中的 wait_timeout，我为测试设置）。 在工作台中，我看到已经打开了 4 个连接。我发送请求并收到错误，但在工作台中我已经看到 5 个连接。

错误：

org.hibernate.exception.JDBCConnectionException: No operations allowed after connection closed.
    org.hibernate.exception.internal.SQLStateConverter.convert(SQLStateConverter.java:107)
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:146)
    org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    $Proxy18.prepareStatement(Unknown Source)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:147)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:166)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:145)
    org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1739)
    org.hibernate.loader.Loader.doQuery(Loader.java:828)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
    org.hibernate.loader.Loader.doList(Loader.java:2463)
    org.hibernate.loader.Loader.doList(Loader.java:2449)
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
    org.hibernate.loader.Loader.list(Loader.java:2274)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1115)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:890)
    com.test.dao.UserDAO.getTimeLastActivity(UserDAO.java:150)
    com.test.servlets.PostFilter.doFilter(PostFilter.java:75)
    com.test.servlets.PathFilter.doFilter(PathFilter.java:57)


root cause 
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    com.mysql.jdbc.Util.getInstance(Util.java:386)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
    com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1205)
    com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1197)
    com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4186)
    com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4152)
    com.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:213)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:138)
    org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    $Proxy18.prepareStatement(Unknown Source)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:147)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:166)
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:145)
    org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1739)
    org.hibernate.loader.Loader.doQuery(Loader.java:828)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
    org.hibernate.loader.Loader.doList(Loader.java:2463)
    org.hibernate.loader.Loader.doList(Loader.java:2449)
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
    org.hibernate.loader.Loader.list(Loader.java:2274)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1115)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:890)
    com.test.dao.UserDAO.getTimeLastActivity(UserDAO.java:150)
    com.test.servlets.PostFilter.doFilter(PostFilter.java:75)
    com.test.servlets.PathFilter.doFilter(PathFilter.java:57)


root cause 
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 96 189 milliseconds ago.  The last packet sent successfully to the server was 0 milliseconds ago.
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3102)
    com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
    com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
    com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
    com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293)
    com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
    org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    $Proxy19.executeQuery(Unknown Source)
    org.hibernate.loader.Loader.getResultSet(Loader.java:1978)
    org.hibernate.loader.Loader.doQuery(Loader.java:829)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
    org.hibernate.loader.Loader.doList(Loader.java:2463)
    org.hibernate.loader.Loader.doList(Loader.java:2449)
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
    org.hibernate.loader.Loader.list(Loader.java:2274)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1115)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:890)
    com.test.dao.UserDAO.getTimeLastActivity(UserDAO.java:150)
    com.test.servlets.PostFilter.doFilter(PostFilter.java:75)
    com.test.servlets.PathFilter.doFilter(PathFilter.java:57)


root cause 
java.net.SocketException: Software caused connection abort: recv failed
    java.net.SocketInputStream.socketRead0(Native Method)
    java.net.SocketInputStream.read(SocketInputStream.java:150)
    java.net.SocketInputStream.read(SocketInputStream.java:121)
    com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
    com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
    com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
    com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2549)
    com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3002)
    com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
    com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
    com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
    com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293)
    com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
    org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    $Proxy19.executeQuery(Unknown Source)
    org.hibernate.loader.Loader.getResultSet(Loader.java:1978)
    org.hibernate.loader.Loader.doQuery(Loader.java:829)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
    org.hibernate.loader.Loader.doList(Loader.java:2463)
    org.hibernate.loader.Loader.doList(Loader.java:2449)
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
    org.hibernate.loader.Loader.list(Loader.java:2274)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1115)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:890)
    com.test.dao.UserDAO.getTimeLastActivity(UserDAO.java:150)
    com.test.servlets.PostFilter.doFilter(PostFilter.java:75)
    com.test.servlets.PathFilter.doFilter(PathFilter.java:57)

如何解决？

【问题讨论】：

    标签： java mysql hibernate c3p0 jboss7.x


    【解决方案1】：

    我曾经遇到过这样的问题，我从服务器日志中得到了解决方案。

        com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was56936 milliseconds ago.The last packet sent successfully to the server was 56936 milliseconds ago, 
which  is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, 
or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.

    尝试将连接 url 设置为：

    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test?autoReconnect=true</property>

    但他们不建议在使用任何事务存储引擎时这样做。

    【讨论】：

      【解决方案2】：

      尝试通过将其添加到 my.cnf 来增加超时：

      [mysqld]
interactive_timeout=864000
wait_timeout=864000

      【讨论】：

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