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Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.Util.getInstance(Util.java:408)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)

at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2097)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2022)

at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:779)

at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)

at java.sql.DriverManager.getConnection(DriverManager.java:664)

at java.sql.DriverManager.getConnection(DriverManager.java:247)

at TestJDBC.TestJDBC_MySQL.main(TestJDBC_MySQL.java:9)

Caused by: 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 sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)

at com.mysql.jdbc.MysqlIO.(MysqlIO.java:341)

at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189)

at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2038)

... 13 more

Caused by: java.net.UnknownHostException: youmengshanghun

at java.net.InetAddress.getAllByName0(InetAddress.java:1280)

at java.net.InetAddress.getAllByName(InetAddress.java:1192)

at java.net.InetAddress.getAllByName(InetAddress.java:1126)

at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:188)

at com.mysql.jdbc.MysqlIO.(MysqlIO.java:300)

... 15 more