一键端出现这个怎么解决

RIN

X:\M\冒险岛\冒险岛online\Bugger>color B

X:\M\冒险岛\冒险岛online\Bugger>com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransien
tConnectionException: 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(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        at com.mysql.jdbc.Util.getInstance(Util.java:384)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
        at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:
2226)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2127)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:774)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:289)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at database.DatabaseConnection.connectToDB(DatabaseConnection.java:111)
        at database.DatabaseConnection.getConnection(DatabaseConnection.java:45)

        at server.ServerProperties.<clinit>(ServerProperties.java:191)
        at server.Start.run(Start.java:55)
        at server.Start.main(Start.java:187)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communicatio
ns link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driv
er has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1
118)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:343)
        at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:
2168)
        ... 17 more
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.ja
va:256)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:292)
        ... 18 more
Exception in thread "main" java.lang.ExceptionInInitializerError
        at server.Start.run(Start.java:55)
        at server.Start.main(Start.java:187)
Caused by: java.lang.NullPointerException
        at server.ServerProperties.<clinit>(ServerProperties.java:191)
        ... 2 more
请按任意键继续. . .

ゎ._冷

同求，一样的问题卡了我好多天了