com.mysql.jdbc.exceptions.jdbc4.communicationsexception：通信链接失败？

Question

我正在使用hibernate.cfg运行Spring MVC应用程序，如下所示：

    <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.useUnicode">true</property>
    <property name="hibernate.connection.characterEncoding">UTF-8</property>
    <property name="hibernate.connection.charSet">UTF-8</property>
    <property name="connection.url">jdbc:mysql://10.2.10.123:3306/xxx</property>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.username">xxx</property>
    <property name="generate_statistics">false</property>
    <property name="connection.password">xxx</property>
    <property name="c3p0.testConnectionOnCheckout">true</property>
    <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
    <property name="c3p0.acquire_increment">1</property> 
    <property name="c3p0.idle_test_period">100</property> <!-- seconds --> 
    <property name="c3p0.max_size">50</property> 
    <property name="c3p0.max_statements">0</property> 
    <property name="c3p0.min_size">10</property> 
    <property name="c3p0.timeout">7200</property>
    <property name="current_session_context_class">thread</property>
    <property name="c3p0.numHelperThreads">5</property>
    <property name="show_sql">false</property>

当我在本地环境中运行应用程序时，它运行起来没有任何问题。但在服务器上,它给出的异常为：

Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3119)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3573)
    ... 90 more
DEBUG: 11:42:41.858 com.mchange.v2.resourcepool.BasicResourcePool.trace(BasicResourcePool.java:1644) - trace com.mchange.v2.resourcepool.BasicResourcePool@2b5cccf1 [managed: 7, unused: 6, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@5700187d)
DEBUG: 11:42:41.861 com.mchange.v2.resourcepool.BasicResourcePool.decrementPendingAcquires(BasicResourcePool.java:422) - decremented pending_acquires: 0
DEBUG: 11:42:41.858 com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:967) - Successfully destroyed resource: com.mchange.v2.c3p0.impl.NewPooledConnection@61b03322
DEBUG: 11:42:41.861 com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.finerLoggingTestPooledConnection(C3P0PooledConnectionPool.java:323) - Test of PooledConnection [com.mchange.v2.c3p0.impl.NewPooledConnection@c2beb14] on CHECKOUT has FAILED.
java.sql.SQLException: Connection is invalid

Answer 1

我通过将MySQL server上的wait_timeout和interactive_timeout的值增加到3600秒（1小时）来解决这一问题，之前这两个值都设置为60秒。