Netty on Android - IllegalSelectorException

[Trustin Lee]

This is a very interesting problem in that IllegalSelectorException is
supposed to be raised when an attempt is made to register a channel
with a selector that was not created by the provider that created the
channel.  Apparently, it seems like you didn't try to change the NIO
selector provider during the auto-detection process, right? (you
shouldn't)  I suspect it's a bug of Android.

Could you check out the latest revision of Netty from the SVN
repository and modify the 301st line of NioProviderMetadata.java to
catch java.lang.Exception instead of ClosedChannelException to see if
it works around the problem?

— Trustin Lee, http://gleamynode.net/



On Sun, Jan 18, 2009 at 10:42 PM, Monk <funkmonk at gmx.net> wrote:
>
> Hi,
> I try to port a Netty client to Android (using Netty 3.1.0 ALPHA3) and ran
> into some trouble. Especially in this area of the code:
>
> private void initClientConnection() {
>        String host = "10.0.2.2";
>        int port = 8080;
>
>        this.factory =
>            new NioClientSocketChannelFactory(
>            Executors.newCachedThreadPool(),
>            Executors.newCachedThreadPool());
>
>        this.bootstrap = new ClientBootstrap(factory);
>
>        this.handler = new ClientLogicHandler(this.main);
>
>        this.clPipelineFactory = new PipelineFactory(this.handler);
>        bootstrap.setPipelineFactory(this.clPipelineFactory);
>
>        bootstrap.setOption("child.tcpNoDelay", true);
>        bootstrap.setOption("child.keepAlive", true);
>        bootstrap.setOption("remoteAddress", new InetSocketAddress(host,
> port));
>    }
>
> When simply running or debugging my program in the Android emulator (using
> Eclipse), the following Exception appears:
>
> threadid=17: thread exiting with uncaught exception (group=0x40010e28)
> Uncaught handler: thread Thread-10 exiting due to uncaught exception
>  java.nio.channels.IllegalSelectorException
>
> java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:133)
>  java.nio.channels.SelectableChannel.register(SelectableChannel.java:117)
>
> org.jboss.netty.channel.socket.nio.NioProviderMetadata$ConstraintLevelAutodetector
>    .autodetectWithoutTimeout(NioProviderMetadata.java:300)
>
> org.jboss.netty.channel.socket.nio.NioProviderMetadata$ConstraintLevelAutodetector$1
>    .run(NioProviderMetadata.java:242)
>
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:72)
>  java.lang.Thread.run(Thread.java:935)
>
> I ran through it with the debugger and the exception seems to appear when
> the first NioWorker gets created somewhere in the
> NioClientSocketChannelFactory constructor which instantiates
> NioClientSocketPipelineSink.
>
> Any suggestions what might be the problem? I would really appreciate your
> help!
>
> --
> View this message in context: http://n2.nabble.com/Netty-on-Android---IllegalSelectorException-tp2177020p2177020.html
> Sent from the Netty User Group mailing list archive at Nabble.com.
>
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