com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 1,083,707 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago.
at sun.reflect.GeneratedConstructorAccessor66.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3090)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2979)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3520)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1990)
,,,,,,,,,,,,,,,,,,,,,,,
Caused by: java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2537)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2990)
... 115 more
总是出现这个错误，每过几分钟就出现一次，在页面操作第一次出现这个错误，点击操作第二次就可以。
网上说的：
mysql﹥ show global variables like 'wait_timeout';
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| wait_timeout | 28800 | //---->默认空闲连接时间8个小时,超时将关闭该连接
+---------------+---------+
但是好像并不是这个问题，也不存在8个小时不操作，8分钟都没有。
------解决方案--------------------
楼主请参考http://blog.csdn.net/nemo2011/article/details/6526121
------解决方案--------------------
是不是连接超时了。
------解决方案--------------------
看样子是连接池超时的问题，给楼主个参考
jdbc4.CommunicationsException: Communications link failure 与Mysql空闲等待时间