dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java [364:379]:
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    private static Codec2 getChannelCodec(URL url) {
        String codecName = url.getParameter(Constants.CODEC_KEY);
        if (StringUtils.isEmpty(codecName)) {
            // codec extension name must stay the same with protocol name
            codecName = url.getProtocol();
        }
        FrameworkModel frameworkModel = getFrameworkModel(url.getScopeModel());
        if (frameworkModel.getExtensionLoader(Codec2.class).hasExtension(codecName)) {
            return frameworkModel.getExtensionLoader(Codec2.class).getExtension(codecName);
        } else if (frameworkModel.getExtensionLoader(Codec.class).hasExtension(codecName)) {
            return new CodecAdapter(
                    frameworkModel.getExtensionLoader(Codec.class).getExtension(codecName));
        } else {
            return frameworkModel.getExtensionLoader(Codec2.class).getExtension("default");
        }
    }
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dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/transport/AbstractEndpoint.java [54:69]:
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    protected static Codec2 getChannelCodec(URL url) {
        String codecName = url.getParameter(Constants.CODEC_KEY);
        if (StringUtils.isEmpty(codecName)) {
            // codec extension name must stay the same with protocol name
            codecName = url.getProtocol();
        }
        FrameworkModel frameworkModel = getFrameworkModel(url.getScopeModel());
        if (frameworkModel.getExtensionLoader(Codec2.class).hasExtension(codecName)) {
            return frameworkModel.getExtensionLoader(Codec2.class).getExtension(codecName);
        } else if (frameworkModel.getExtensionLoader(Codec.class).hasExtension(codecName)) {
            return new CodecAdapter(
                    frameworkModel.getExtensionLoader(Codec.class).getExtension(codecName));
        } else {
            return frameworkModel.getExtensionLoader(Codec2.class).getExtension("default");
        }
    }
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