了ibatis +的GlassFish：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException：通信鏈路故障

Question

我不斷收到錯誤隨機：

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException：通信鏈路故障

任何人有想法？

ERROR: java.sql.Connection - Error calling Connection.setAutoCommit: 
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 

The last packet successfully received from the server was 129,064 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago. 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:409) 
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3055) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2941) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3489) 

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:2502) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2952) 
    ... 83 more 

Answer 1

MySQL服務器不監聽默認的TCP端口3306上。要允許（遠程）TCP連接，請在/etc/mysql/my.cnf中註釋以下行：

skip-networking