タイムアウトで接続が閉じられた後、hibernateがmysqlに再接続できませんでした

Question

私はJavaアプリケーションを持っています。私はプール接続を作成します。

<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 

私はHibernateの4.0_finalとC3P0、MySQLのJBoss上で7.0.2

hibernate.cfg.xmlのASを使用していますデータベースとの作業のためにセッションを取得するクラス。

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(); 
     } 
    } 
} 

SessionFactoryを作成した後、私はMySQL_WorkBenchで自分のデータベースと5接続しています。その後、私はリクエストを送信し、50秒待っています（私はテスト用に設定したMySql_Serverのwait_timeout）。 Workbenchでは、すでに開いている4接続が表示されます。リクエストを送信してエラーが発生しましたが、ワークベンチではすでに5接続が表示されています。

エラー：

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) 

それをどのように修正するには？

Answer 1

私はこのような問題に直面し、私はサーバーのログから解決策を得ました。

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. 

に接続URLを設定してみてください：

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

しかし、どのようなトランザクションストレージエンジンを使用しているとき、彼らはそれをお勧めしません。

Answer 2

は、my.cnfのためにこれを追加することで、タイムアウトを増やしてみてください：

[mysqld] 
interactive_timeout=864000 
wait_timeout=864000