Unable to create Channel from class AioServerSocketChannel

[ghost]

Well, I am trying to launch a server using AioServerSocketChannel.
The code is like this:

bootstrap = new ServerBootstrap();
        bootstrap.group(new AioEventLoopGroup(), new AioEventLoopGroup())
                .channel(AioServerSocketChannel.class)
                .localAddress(isa)
                .option(ChannelOption.SO_BACKLOG, 100)
                .childOption(ChannelOption.CONNECT_TIMEOUT_MILLIS, 100)
                .childOption(ChannelOption.SO_REUSEADDR, true)
                .childOption(ChannelOption.TCP_NODELAY, true)
                .childHandler(channelInitializer);
bootstrap.bind();

The problem is when I launch application such exception occures:

io.netty.channel.ChannelException: Unable to create Channel from class class io.netty.channel.socket.aio.AioServerSocketChannel
    at io.netty.bootstrap.AbstractBootstrap$BootstrapChannelFactory.newChannel(AbstractBootstrap.java:239) ~[netty-4.0.0.Alpha5.jar:na]
    at io.netty.bootstrap.AbstractBootstrap.bind(AbstractBootstrap.java:176) ~[netty-4.0.0.Alpha5.jar:na]
...
Caused by: java.lang.InstantiationException: io.netty.channel.socket.aio.AioServerSocketChannel
    at java.lang.Class.newInstance0(Class.java:357) ~[na:1.7.0_07]
    at java.lang.Class.newInstance(Class.java:325) ~[na:1.7.0_07]
    at io.netty.bootstrap.AbstractBootstrap$BootstrapChannelFactory.newChannel(AbstractBootstrap.java:237) ~[netty-4.0.0.Alpha5.jar:na]
    ... 13 common frames omitted

When I rewrite code to use NIO implementation it works fine.

Where can be the problem? Do I initialize AIO server correctly?

P.S. Sorry for my ban English.

[ghost]

I think that the problem is in AioServerSocketChannel: class has no nullary constructor which is needed for newInstance() function.

[normanmaurer]

Normally you would need to use this for ServerChannel implementations that not contain a no-args constructor:

        AioEventLoopGroup parentGroup = new AioEventLoopGroup();
        AioEventLoopGroup childGroup = new AioEventLoopGroup(); 
        bootstrap = new ServerBootstrap();
        bootstrap.group(parentGroup, childGroup)
                .channelFactory(new ChannelFactory() {

                    @Override
                    public Channel newChannel() {
                        return new AioServerSocketChannel(parentGroup, childGroup);
                    }
                })
                .localAddress(isa)
                .option(ChannelOption.SO_BACKLOG, 100)
                .childOption(ChannelOption.CONNECT_TIMEOUT_MILLIS, 100)
                .childOption(ChannelOption.SO_REUSEADDR, true)
                .childOption(ChannelOption.TCP_NODELAY, true)
                .childHandler(channelInitializer);
         bootstrap.bind();

But I think we should make that easier.. Let me take care of this

[ghost]

Thanks a lot for help! This is a little bit confusing but works perfect.

[normanmaurer]

np... in the next release it should also work without the need of create the factory by yourself.

fa805c4

[dantran]

just tested with the latest changes using the starting template but running into 'factory already set'. Ended up the use the mentioned work around

[normanmaurer]

@dantran intresting.. could you add the stacktrace into here ?

[trustin]

@dantran, it should be fixed now.

[trustin]

See b3be152 for the diff.