java.lang.IllegalStateException: Illegal access: this web application instance has been stopped

java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [org.apache.zookeeper.ZooKeeperTestable]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.

解决：
dubbo 测试 zookeeper ，检查是否打开zooKeeper 服务