Netty on Android - IllegalSelectorException

[Trustin Lee]

I have confirmed that an IllegalSelectorException is raised by the
Android platform in the emulator.  The problem has been fixed by
making sure NIO constraint level auto-detection mechanism swallows all
possible throwables during its initialization.  After the fix is
applied, my proof-of-concept Android application communicates with a
server successfully.  Please check out the latest SVN revision and
give it a try.

HTH,

— Trustin Lee, http://gleamynode.net/

On Tue, Jan 20, 2009 at 1:57 AM, Trustin Lee <trustin at gleamynode.net> wrote:
> BTW, it would be great if you could provide a simplistic sample
> Android application project (Eclipse project) that reproduces the
> problem, although it's just enough if you can modify
> NioProviderMetadata.java to swallow all unexpected exceptions.  Please
> let me know what the result looks like.
>
> Thanks in advance,
>
> — Trustin Lee, http://gleamynode.net/
>
>
>
> On Tue, Jan 20, 2009 at 1:39 AM, Trustin Lee <trustin at gleamynode.net> wrote:
>> 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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>>>
>>
>