Jdk17连接zookeeper报错：127.0.0.1/＜unresolved＞:2181

dubbo连接zookeeper报错：

org.apache.zookeeper.ClientCnxn : Session 0x0 for server 127.0.0.1/<unresolved>:2181, unexpected error, closing socket connection and attempting reconnect

java.lang.IllegalArgumentException: Unable to canonicalize address 127.0.0.1/<unresolved>:2181 because it's not resolvable

问题原因：

Zookeeper对象实例化时，会调用InetSocketAddress的toString方法；而在jdk17中，该方法解析空字符串会拼装/<unresolved>

解决方法:

1、更换jdk17为jdk8；

2、升级本机引入的zookeeper依赖，例如3.9.1版本

<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version>3.9.1</version>
</dependency>