2015/10/14 10:02:08 play.main(:570) ERROR Cannot connected to the database : Communications link fa

2015/10/14 10:02:08  play.main(:570) ERROR Cannot connected to the database : Communications link failure


The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure


The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:348)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2391)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2428)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at play.db.DBPlugin.onApplicationStart(DBPlugin.java:109)
at play.plugins.PluginCollection.onApplicationStart(PluginCollection.java:525)
at play.Play.start(Play.java:533)
at play.Play.init(Play.java:305)
at play.server.Server.main(Server.java:162)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:298)
... 15 more
2015/10/14 10:02:08  play.main(:570) ERROR


Can't start in PROD mode with errors


Database error
A database error occured : Cannot connected to the database, Communications link failure  The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.


play.exceptions.DatabaseException: Cannot connected to the database, Communications link failure


The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at play.db.DBPlugin.onApplicationStart(DBPlugin.java:161)
at play.plugins.PluginCollection.onApplicationStart(PluginCollection.java:525)
at play.Play.start(Play.java:533)
at play.Play.init(Play.java:305)
at play.server.Server.main(Server.java:162)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

由于公司需要，去其他公司办公一段时间。这不来到这个公司之后发现网络奇差，不能使用外网访问公司项目，那只能在本地搭载了。可是刚换了mac电脑，环境还没有配好那……，项目启动出的问题，可以看出是数据出了问题。

查看配置文件命令：ps aux | grep mysql

找到问题原因了：
事实是mac装mysql默认端口是3307，而修改端口也不是修改my.cnf配置文件，而是修改自启动文件：
/Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist