背景、netty抛出完整的error信息如下：
2018-02-08 14:30:43.098 [nioEventLoopGroup-5-1] ERROR io.netty.util.ResourceLeakDetector:176 - LEAK: ByteBuf.release() was not called before it's garbage-collected. Enable advanced leak reporting to find out where the leak occurred. To enable advanced leak reporting, specify the JVM option '-Dio.netty.leakDetection.level=advanced' or call ResourceLeakDetector.setLevel() See https://netty.io/wiki/reference-counted-objects.html for more information.2018-02-08 14:30:43.0
