java.lang.NoClassDefFoundError: io/netty/channel/AbstractChannel$AbstractUnsafe$

    at io.netty.channel.AbstractChannel$AbstractUnsafe.deregister(AbstractChannel.java:)

    at io.netty.channel.AbstractChannel$AbstractUnsafe.fireChannelInactiveAndDeregister(AbstractChannel.java:)

    at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:)

    at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:)

    at io.netty.channel.nio.NioEventLoop.closeAll(NioEventLoop.java:)

    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:)

    at io.netty.util.concurrent.SingleThreadEventExecutor$.run(SingleThreadEventExecutor.java:)

    at io.netty.util.internal.ThreadExecutorMap$.run(ThreadExecutorMap.java:)

    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:)

    at java.lang.Thread.run(Thread.java:)

Caused by: java.lang.ClassNotFoundException: io.netty.channel.AbstractChannel$AbstractUnsafe$

    at java.net.URLClassLoader.findClass(URLClassLoader.java:)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:)

    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:)

    ...  common frames omitted

-- ::39.632 default [nioEventLoopGroup--] ERROR i.n.u.c.D.rejectedExecution - Failed to submit a listener notification task. Event loop shut down?

java.lang.NoClassDefFoundError: io/netty/util/concurrent/GlobalEventExecutor$

    at io.netty.util.concurrent.GlobalEventExecutor.startThread(GlobalEventExecutor.java:)

    at io.netty.util.concurrent.GlobalEventExecutor.execute(GlobalEventExecutor.java:)

    at io.netty.util.concurrent.DefaultPromise.safeExecute(DefaultPromise.java:)

    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:)

    at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:)

    at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:)

    at io.netty.util.concurrent.DefaultPromise.setSuccess(DefaultPromise.java:)

    at io.netty.util.concurrent.SingleThreadEventExecutor$.run(SingleThreadEventExecutor.java:)

    at io.netty.util.internal.ThreadExecutorMap$.run(ThreadExecutorMap.java:)

    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:)

    at java.lang.Thread.run(Thread.java:)

Caused by: java.lang.ClassNotFoundException: io.netty.util.concurrent.GlobalEventExecutor$

    at java.net.URLClassLoader.findClass(URLClassLoader.java:)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:)

    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:)

    ...  common frames omitted

<dependency>

  <groupId>io.netty</groupId>

   <artifactId>netty-all</artifactId>

   <!--<version>4.1.37.Final</version>-->

</dependency>