Zookeeper启动zkServer.cmd闪退, zk服务启动跟报错：Unexpected exception, exiting abnormally java.net.BindException

运行cmd，查看Error报错内容

2021-06-22 10:24:21,727 [myid:] - ERROR [main:ZooKeeperServerMain@63] - Unexpected exception, exiting abnormally
java.net.BindException: Address already in use: bind
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:433)
        at sun.nio.ch.Net.bind(Net.java:425)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
        at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:90)
        at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:111)
        at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
        at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)

由报错信息知，zookeeper的2181端口被占用。有以下几种可能：

1. zookeeper已经打开，没有正常关闭
2. 2181端口被其他应用占用

netstat -ano|findstr "2181"；

发现2181端口被PID为4048的进程占用。

tasklist|findstr "4048"；

查询发现4048是java.exe

kill掉4048进程，此时发现zkServer.cmd已经可以正常运行。