의 Netty 서버 종료 예외

Question

나는 서버 종료를 처리하기 위해 다음과 같은 코드를 사용하고 있습니다 :

public void stop() { 
     try { 
      this.channelFuture.channel().close(); 
      this.channelFuture.channel().closeFuture().sync(); 
     } catch (InterruptedException e) { 
      Log.exceptionStack(e); 
     } finally { 
      this.bootstrap.config().childGroup().shutdownGracefully(10, 30, TimeUnit.SECONDS); 
      this.bootstrap.config().group().shutdownGracefully(5, 10, TimeUnit.SECONDS); 
     } 
    } 

때때로 다음과 같은 예외로 서버 shutsdown : 나는 그물코 버전 4.1.9을 사용하고

Exception in thread "nioEventLoopGroup-3-1" java.lang.NoClassDefFoundError: io/netty/buffer/PoolArena$1 
     at io.netty.buffer.PoolArena.freeChunk(PoolArena.java:293) 
     at io.netty.buffer.PoolThreadCache$MemoryRegionCache.freeEntry(PoolThreadCache.java:471) 
     at io.netty.buffer.PoolThreadCache$MemoryRegionCache.free(PoolThreadCache.java:441) 
     at io.netty.buffer.PoolThreadCache$MemoryRegionCache.free(PoolThreadCache.java:433) 
     at io.netty.buffer.PoolThreadCache.free(PoolThreadCache.java:290) 
     at io.netty.buffer.PoolThreadCache.free(PoolThreadCache.java:281) 
     at io.netty.buffer.PoolThreadCache.free0(PoolThreadCache.java:254) 
     at io.netty.buffer.PoolThreadCache.free(PoolThreadCache.java:250) 
     at io.netty.buffer.PooledByteBufAllocator$PoolThreadLocalCache.onRemoval(PooledByteBufAllocator.java:431) 
     at io.netty.buffer.PooledByteBufAllocator$PoolThreadLocalCache.onRemoval(PooledByteBufAllocator.java:408) 
     at io.netty.util.concurrent.FastThreadLocal.remove(FastThreadLocal.java:226) 
     at io.netty.util.concurrent.FastThreadLocal.removeAll(FastThreadLocal.java:67) 
     at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:146) 
     at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.ClassNotFoundException: io.netty.buffer.PoolArena$1 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
     ... 14 more 
Exception in thread "Thread-1" java.lang.NoClassDefFoundError: io/netty/channel/AbstractChannelHandlerContext$13 
     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:610) 
     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:465) 
     at io.netty.channel.DefaultChannelPipeline.close(DefaultChannelPipeline.java:964) 
     at io.netty.channel.AbstractChannel.close(AbstractChannel.java:234) 
     at co.gps.smaartly.TrackerServer.stop(TrackerServer.java:59) 
     at co.gps.smaartly.ServerManager.stop(ServerManager.java:90) 
     at co.gps.smaartly.App$1.run(App.java:22) 
Caused by: java.lang.ClassNotFoundException: io.netty.channel.AbstractChannelHandlerContext$13 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
     ... 7 more 

.

java version "1.8.0_121" 
Java(TM) SE Runtime Environment (build 1.8.0_121-b13) 
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode) 

를 우분투 16.04에 : JVM 버전에 대한 최종

여기에서 문제를 파악하도록 도와주세요. 다른 세부 정보가 필요한지 알려주십시오.

Answer 1

이것은 종료가 100 % 완료되기 전에 항아리가 언로드되기 때문에 발생했을 가능성이 큽니다. .shutdownGracefully(...)은 비동기식이므로 여기에서 .shutdownGracefully(...).sync()을 사용해야합니다.