Exceptions, it turns out, don't fire this direction. Deprecated for 6 years.

Author: mbax

src/main/java/org/kitteh/irc/client/library/defaults/feature/network/NettyConnection.java

@@ -29,7 +29,6 @@
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.channel.ChannelOutboundHandlerAdapter;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.handler.codec.DelimiterBasedFrameDecoder;
 import io.netty.handler.codec.MessageToMessageEncoder;
@@ -218,14 +217,6 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
                 }
             }
         });
-        this.channel.pipeline().addFirst("[OUTPUT] Exception handler", new ChannelOutboundHandlerAdapter() {
-            @Override
-            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
-                if (cause instanceof Exception) {
-                    NettyConnection.this.handleException((Exception) cause);
-                }
-            }
-        });
 
         // Clean up on disconnect
         this.channel.closeFuture().addListener(future -> {