驱动注册成功 com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.net.Conn

驱动注册成功

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.ConnectException

c

STACKTRACE:

java.net.ConnectException: Connection refused: connect

at java.net.PlainSocketImpl.socketConnect(Native Method)

at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)

at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)

at java.net.Socket.connect(Socket.java:529)

at java.net.Socket.connect(Socket.java:478)

at java.net.Socket.<init>(Socket.java:375)

at java.net.Socket.<init>(Socket.java:218)

at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)

at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)

at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)

at com.mysql.jdbc.Connection.<init>(Connection.java:1555)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)

at java.sql.DriverManager.getConnection(DriverManager.java:582)

at java.sql.DriverManager.getConnection(DriverManager.java:185)

at com.bn.ex12k.jdbcUtil.getConnection(jdbcUtil.java:82)

at com.bn.ex12k.Test.main(Test.java:16)

** END NESTED EXCEPTION **

Last packet sent to the server was 1 ms ago.

at com.mysql.jdbc.Connection.createNewIO(Connection.java:2847)

at com.mysql.jdbc.Connection.<init>(Connection.java:1555)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)

at java.sql.DriverManager.getConnection(DriverManager.java:582)

at java.sql.DriverManager.getConnection(DriverManager.java:185)

at com.bn.ex12k.jdbcUtil.getConnection(jdbcUtil.java:82)

at com.bn.ex12k.Test.main(Test.java:16)

Exception in thread "main" java.lang.NullPointerException

at com.bn.ex12k.jdbcUtil.updateDB(jdbcUtil.java:96)

at com.bn.ex12k.Test.main(Test.java:22)