Mysql中JDBC如何实现自动重连机制的实例-木庄网络博客

本文摘自PHP中文网，作者黄舟，侵删。

最近在工作中发现了一个问题，通过查找相关的资料终于解决了，下面这篇文章主要给大家介绍了关于JDBC实现Mysql自动重连机制的相关资料，文中给出多种解决的方法，需要的朋友可以参考借鉴，下面来一起看看吧。

前言

本文主要给大家介绍的是关于JDBC实现Mysql自动重连机制的相关内容，分享出来供大家参考学习，下面来一起看看详细的介绍：

日志：using the Connector/J connection property 'autoReconnect=true' to avoid this problem

com.mysql.jdbc.CommunicationsException: The last packet successfully received from the server was58129 seconds ago.The last packet sent successfully to the server was 58129 seconds 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.

查了一下，原来是MySQL超时设置的问题

如果连接闲置8小时 (8小时内没有进行数据库操作), mysql就会自动断开连接, 要重启tomcat.

解决办法：

第一种：如果不用hibernate的话, 则在　connection url中加参数: autoReconnect=true

1	`jdbc.url=jdbc:mysql://ipaddress:3306/database?autoReconnect=true&autoReconnectForPools=true`

第二种：用hibernate的话, 加如下属性:

<property name="connection.autoReconnect">true</property>
<property name="connection.autoReconnectForPools">true</property>
<property name="connection.is-connection-validation-required">true</property>

第三种：要是还用c3p0连接池:

<property name="hibernate.c3p0.acquire_increment">1</property> 
<property name="hibernate.c3p0.idle_test_period">0</property> 
<property name="hibernate.c3p0.timeout">0</property>
<property name="hibernate.c3p0.validate">true</property>