Openfire 配置老是出错


A connection to the database could not be made. View the error message by opening the "\logs\error.log" log file, then go back to fix the problem.



我去看了error.log:

2013.09.26 11:40:03 org.jivesoftware.util.log.util.CommonsLogFactory - Prototype
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.net.UnknownHostException
MESSAGE: [host-name]

STACKTRACE:

java.net.UnknownHostException: [host-name]
        at java.net.InetAddress.getAllByName(Unknown Source)
        at java.net.InetAddress.getAllByName(Unknown Source)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:246)
        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(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at org.logicalcobwebs.proxool.DefaultConnectionBuilder.buildConnection(DefaultConnectionBuilder.java:39)
        at org.logicalcobwebs.proxool.Prototyper.buildConnection(Prototyper.java:159)
        at org.logicalcobwebs.proxool.Prototyper.sweep(Prototyper.java:102)
        at org.logicalcobwebs.proxool.PrototyperThread.run(PrototyperThread.java:44)

** END NESTED EXCEPTION **

Last packet sent to the server was 0 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(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at org.logicalcobwebs.proxool.DefaultConnectionBuilder.buildConnection(DefaultConnectionBuilder.java:39)
        at org.logicalcobwebs.proxool.Prototyper.buildConnection(Prototyper.java:159)
        at org.logicalcobwebs.proxool.Prototyper.sweep(Prototyper.java:102)
        at org.logicalcobwebs.proxool.PrototyperThread.run(PrototyperThread.java:44)

不知道哪里错了。。。
mysql数据库我都完全卸载，注册表都删得一干二净了，重启电脑，又重新安装过mysql还是不行。。。

有谁配置过Openfire 的话，指导一下，哪里配置出问题了？？！？！？！？
[解决办法]
host-name你指定了吗
database-name你指定了吗