mysql 连接池连接超时的问题(The last packet successfully received from the server was 2,431 milliseconds ago. The last packet sent successfully to the server was 2,417 milliseconds ago.)

标签：lod   sele   org   err   enc   host   jdbc   lis   java   

org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 2,431 milliseconds ago.  The last packet sent successfully to the server was 2,417 milliseconds ago.
### The error may exist in com/melodyhub/mapper/UserMapper.xml
### The error may involve com.melodyhub.mapper.UserMapper.selectUser
### The error occurred while executing a query
### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 2,431 milliseconds ago.  The last packet sent successfully to the server was 2,417 milliseconds ago.

	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
	

解决：
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。

在connection url中加参数: autoReconnect=true

jdbc.url=jdbc:mysql://localhost:3306/database?autoReconnect=true&autoReconnectForPools=true

mysql 连接池连接超时的问题(The last packet successfully received from the server was 2,431 milliseconds ago. The last packet sent successfully to the server was 2,417 milliseconds ago.)

标签：lod   sele   org   err   enc   host   jdbc   lis   java   

原文地址：https://www.cnblogs.com/melodyjerry/p/13586846.html