【异常】The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

1 详细异常信息

The last packet sent successfully to the server was  milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.GeneratedConstructorAccessor35.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
        at sun.reflect.GeneratedConstructorAccessor31.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
        at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:)
        at java.net.Socket.connect(Socket.java:)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:)
        ...  more

om.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was  milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.GeneratedConstructorAccessor39.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
        at sun.reflect.GeneratedConstructorAccessor34.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
        at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:)
                                                                                                                                                                      ,-      %
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:)
        at java.net.Socket.connect(Socket.java:)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:)
        ...  more
// :: WARN resourcepool.BasicResourcePool: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2767a64c -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (). Last acquisition attempt exception:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was  milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.GeneratedConstructorAccessor39.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
        at sun.reflect.GeneratedConstructorAccessor34.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
        at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:)

2 自己是在Spark程序里面调用的mysql的程序，因为是分布式环境，所以不一定是在本机调用mysql连接

分布式环境 不要用localhost的配置，导致远程主机找不到