CommunicationsException: Communications link failure

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 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
Caused by: java.ConnectException: Connection refused: connect
	at java.DualStackPlainSocketImpl.waitForConnect(Native Method)
	at java.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
	at java.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.Socket.connect(Socket.java:589)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:213)
	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:297)
	... 119 common frames omitted

2019-04-11 10:32:28.952 ERROR 13184 --- [  XNIO-2 task-2] com..CustomHandlerExceptionResolver : request has an error: uri=/user,content-type=application/json,error=SYS9999

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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.
### The error may exist in file [E:\javaproject\x.xml]
### The error may involve com.Count
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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 org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
	at com.sun.proxy.$Proxy97.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:83)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
	at com.sun.proxy.$Proxy105.selectUserListCount(Unknown Source)
	at com.User(UserServiceImpl.java:98)
	at com.User(UserController.java:154)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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.
### The error may exist in file [E:\javaproject\x.xml]
### The error may involve com.Count
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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 org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
	... 70 common frames omitted
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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 org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81)
	at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)
	at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68)
	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:338)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
	... 77 common frames omitted
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:377)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:338)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2232)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
Caused by: java.ConnectException: Connection refused: connect
	at java.DualStackPlainSocketImpl.waitForConnect(Native Method)
	at java.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
	at java.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.Socket.connect(Socket.java:589)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:213)
	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:297)
	... 119 common frames omitted

今天启动springboot项目突然报错，没有修改过数据库配置呀，连接不上数据库了，telnet一下，果然不通，运维同事换了环境了，却没通知，更换运行同事给的新部署ip 端口，telnet通了