java.lang.AbstractMethodError：io.netty.handler.codec.http.DefaultFullHttpRequest.touch(Ljava/lang/Object;)Lio/netty/util/ReferenceCounted

Question

I'm new to the world of Java and trying to send a Https request. When I try to send a request through the channel I get the following error

java.lang.AbstractMethodError:io.netty.handler.codec.http.DefaultFullHttpRequest.touch(Ljava/lang/Object;)Lio/netty/util/ReferenceCounted

Here is my pipeline code

if (sslCtx != null) {
                         ch.pipeline().addLast(sslCtx.newHandler(ch.alloc()));
                     }

                     ch.pipeline().addLast(new HttpClientCodec());

                     ch.pipeline().addLast(new HttpContentDecompressor());

                     ch.pipeline().addLast(new HttpObjectAggregator(1048576));
                     ch.pipeline().addLast("encoder", new HttpRequestEncoder());
                     ch.pipeline().addLast(new ClientHandler());

Here is my bootstrap code

ChannelFuture f = b.connect(host, port).sync(); 

             ByteBuf bbuf = Unpooled.copiedBuffer(message, StandardCharsets.UTF_8);

             FullHttpRequest request = new DefaultFullHttpRequest(
                     HttpVersion.HTTP_1_1, HttpMethod.POST, uri,bbuf,Boolean.FALSE);
             request.headers().set(HttpHeaders.Names.HOST, host);
             request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
             request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, bbuf.readableBytes());
             ((DefaultFullHttpRequest) request).content().clear().writeBytes(bbuf);

             f.channel().writeAndFlush(request);

Stacktrace:

Exception in thread "main" java.lang.AbstractMethodError: io.netty.handler.codec.http.DefaultFullHttpRequest.touch(Ljava/lang/Object;)Lio/netty/util/ReferenceCounted;
    at io.netty.util.ReferenceCountUtil.touch(ReferenceCountUtil.java:73)
    at io.netty.channel.DefaultChannelPipeline.touch(DefaultChannelPipeline.java:107)
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:821)
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:805)
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:842)
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032)
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296

Context: Trying to send an HTTPS request

What am I doing wrong?

Answer 1

This is most likely because you have multiple Netty 4.x dependency versions on your class path. Just ensure you only have the latest on the class path and it should work