Netty 5 io.netty.util.IllegalReferenceCountException 异常

本文解析了一个Netty中出现的IllegalReferenceCountException异常,该异常源于SimpleChannelInboundHandler的channelRead方法不当释放消息引用计数。文章提供了解决方案,即通过修改handler的继承类来避免异常。

异常信息

io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

原因

handler 继承了 SimpleChannelInboundHandler,SimpleChannelInboundHandler 中 channelRead 代码如下:

public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
    boolean release = true;

    try {
        if (this.acceptInboundMessage(msg)) {
            this.messageReceived(ctx, msg);
        } else {
            release = false;
            ctx.fireChannelRead(msg);
        }
    } finally {
        if (this.autoRelease && release) {
            ReferenceCountUtil.release(msg);
        }

    }

}

在 finally 代码块中释放了 msg

解决方案

handler 改继承 ChannelHandlerAdapter

参考:netty 中遇到的一个坑 SimpleInboundHandler,记录一下

转载于:https://www.cnblogs.com/victorbu/p/10642564.html

11:24:25.865 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework 11:24:25.868 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false 11:24:25.869 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - Java version: 8 11:24:25.869 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available 11:24:25.869 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.storeFence: available 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available 11:24:25.870 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available 11:24:25.871 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\admin\AppData\Local\Temp (java.io.tmpdir) 11:24:25.871 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model) 11:24:25.871 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - Platform: Windows 11:24:25.871 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 7570718720 bytes 11:24:25.871 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: -1 11:24:25.872 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.CleanerJava6 - java.nio.ByteBuffer.cleaner(): available 11:24:25.872 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false 11:24:26.010 [main] DEBUG io.grpc.netty.shaded.io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 48 11:24:26.018 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024 11:24:26.018 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096 11:24:26.021 [main] DEBUG io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false 11:24:26.021 [main] DEBUG io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512 11:24:26.024 [main] DEBUG io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available客户端运行结果如下,请分析并提出解决方案
最新发布
08-26
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