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java CountDownLatch报错java.lang.IllegalMonitorStateException: null

笔者使用 websocket 进行通信，服务器异步返回。websocket 服务器又异步调用其他 websocket，也是异步访问。

由于无法预测服务器调用第三方 websocket 什么时候调用结束，使用了 CountDownLatch。

每次报错都如下：

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java.lang.reflect.InvocationTargetException: null
    at sun.reflect.GeneratedMethodAccessor419.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45005)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.yeauty.pojo.PojoEndpointServer.doOnMessage(PojoEndpointServer.java:180)
    at org.yeauty.standard.WebSocketServerHandler.handleWebSocketFrame(WebSocketServerHandler.java:39)
    at org.yeauty.standard.WebSocketServerHandler.channelRead0(WebSocketServerHandler.java:19)
    at org.yeauty.standard.WebSocketServerHandler.channelRead0(WebSocketServerHandler.java:9)
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalMonitorStateException: null
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
    at com.xxx.web.open.ws.RealTimeTTSEndpoint.onSendEOS(RealTimeTTSEndpoint.java:142)
    at com.xxx.web.open.ws.RealTimeTTSEndpoint.onMessage(RealTimeTTSEndpoint.java:103)
    ... 28 common frames omitted
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后来查代码看看，是

CountDownLatch.await() 方法手误写成CountDownLatch.wait()
注意 await 与 wait 一字之差。
错误：
connectClose.wait();

正确：

connectClose.await();