1. 确认自己的 zookeeper 地址是不是正确
  2. 确认自己的 zookeeper jar 包版本是不是合适
  3. 我的一个可以连接到 zookeeper 3.4.6 的 maven 配置
<!-- dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.jboss.netty</groupId>
                    <artifactId>netty</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- zkclient -->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
        <!-- zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.6</version>
        </dependency>

        <dependency>
            <groupId>org.jboss.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.2.5.Final</version>
        </dependency>
    <!-- dubbo -->
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