通过zookeeper搭建dubbo注册中心遇到的问题：
在linux下安装，配置并启动zookeeper。
在window环境下启动服务提供方时，未成功启动，报以下错误：
Opening socket connection to server 192.168.153.128/192.168.153.128:2181.Will not attempt to authentic
2017-03-02 19:52:32,270 INFO [org.apache.zookeeper.ZooKeeper] - Initiating client connection, connectString=192.168.153.128:2181 sessionTimeout=30000 watcher=org.I0Itec.zkclient.ZkClient@1d6ba2b
2017-03-02 19:52:32,288 INFO [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 192.168.153.128/192.168.153.128:2181. Will not attempt to authenticate using SASL (unknown error)
2017-03-02 19:52:53,291 WARN [org.apache.zookeeper.ClientCnxn] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection timed out: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2017-03-02 19:52:54,394 INFO [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 192.168.153.128/192.168.153.128:2181. Will not attempt to authenticate using SASL (unknown error)检查之后发现两个问题：
1. zookeeper的服务没有开启
执行./zkServer.sh start
2. 访问不到zookeeper中心是因为 需要关闭防火墙：service iptables stop 否则访问不到2181端口
连接数据库时报错信息如下： Unknown system variable 'language'
上网查了问题大部分都说是jdbc驱动和mysql版本不匹配，于是将maven中mysql的版本调整
mysql-connector-java的jar包不匹配，原来是mysql-connector-java-5.1.36.jar，换成mysql-connector-java-5.1.6.jar之后连接成功