ResourceLeakDetector.setLevel(PARANOID) is not producing resource leak logs

问题

I have a netty 4 http server Implemented.

public void start() {
    System.out.println("In Start method");
    try {
        ServerBootstrap b = new ServerBootstrap();
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        b.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .childHandler(new HttpServerPipelineFactory())
                .option(ChannelOption.SO_BACKLOG, 128)
                .childOption(ChannelOption.WRITE_BUFFER_WATER_MARK, WriteBufferWaterMark.DEFAULT)
                .childOption(ChannelOption.AUTO_READ, false)
                .childOption(ChannelOption.SO_KEEPALIVE, true);

        ChannelFuture f = b.bind(listenerPort).sync();
        System.out.println("server started listening on port " + listenerPort);
        f.channel().closeFuture().sync();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

HTTP pipeline factory class is -

public class HttpServerPipelineFactory extends ChannelInitializer<Channel> {

    @Override
    protected void initChannel(Channel ch) {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast("codec", new HttpServerCodec());
        pipeline.addLast("compress", new HttpContentCompressor());
        pipeline.addLast("decompress", new HttpContentDecompressor());
        pipeline.addLast("aggregator", new HttpObjectAggregator( 512 * 1024));
        pipeline.addLast("chunked", new ChunkedWriteHandler());
        pipeline.addLast("flow", new FlowControlHandler());
        pipeline.addLast("keep-alive", new HttpServerKeepAliveHandler());
        pipeline.addLast("request", new AdvancedHTTPHandler());
    }
}

AdvancedHTTPHandler is -

import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import static io.netty.util.CharsetUtil.UTF_8;

public class AdvancedHTTPHandler extends SimpleChannelInboundHandler<FullHttpRequest> {

    private static Logger logger = LoggerFactory.getLogger(HTTPRequestHandler.class);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) {
        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.copiedBuffer("My Netty".getBytes()), false);
        response.headers().add(request.headers());
        response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
        ctx.channel().writeAndFlush(response);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        super.channelActive(ctx);
        ctx.read();
    }
}

In the Main.java -

    public class Main {
        public static void main(String[] args) {
            ResourceLeakDetector.setLevel(PARANOID);
            HttpServer server = new HttpServer(5020);
            server.start();
        }
    }

As you see in the Main application, I've set ResourceLeakDetector.setLevel(PARANOID); but I don't see any resource leak detection logs in my application logs.

what is that I'm missing. How can I fix this issue?

回答1:

I don't see any leaks in your code so it makes sense that there is no leak reported. Just replace SimpleChannelInboundHandler with ChannelInboundHandlerAdaptor or call request.retain() in your channelRead0(...) method and you will see a report.

来源：https://stackoverflow.com/questions/61134849/resourceleakdetector-setlevelparanoid-is-not-producing-resource-leak-logs

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java

Netty