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From Tim Watts <...@cliftonfarm.org>
Subject Re: unwanted tcp6 protocol in tribes listener socket;
Date Mon, 04 Feb 2013 03:06:02 GMT
On Mon, 2013-02-04 at 14:39 +1300, Vince Stewart wrote:
> Using Tomcat 7.0.35 embedded in Java standalone application. Java SE 1.7.0.
> Ubuntu 12.04
> 
> Hi All,
> 
> I have an experimental class below. The aim is just to open a listening
> port on port 4000 in the "localhost" address.
> When this has run, the address for the listener is "127.0.0.1" in other
> words an IPv4 address.
> However the SocksSocketImpl object representing the real socket continues
> to display the* useV4* property as *false*
> and my Ubuntu system displays the listening socket as "tpc6".
> 
Listening only for tcp6?  What does
	netstat -atn | grep -P ":4000\W"
show?

Perhaps what you want is to set the java.net.preferIPv4Stack system
property in CATALINA_OPTS?  Description here:

http://docs.oracle.com/javase/7/docs/technotes/guides/net/properties.html

But why would you want that limitation?


> I suspect there is some configuration issue somewhere and if anyone can
> help with this, I would be most grateful.
> 
> I have also noted that the java.nio.channels.spi.SelectorProvider cannot
> return a Provider from loadProviderFromProperty() or loadProviderAsService()
> so therefore issues *provider =
> sun.nio.ch.DefaultSelectorProvider.create()*resulting in a
> ServerSocketChannel that is of type
> *sun.nio.ch.ServerSocketChannelImpl*
> and a ServerSocket of type *sun.nio.ch.ServerSocketAdapter*. I'm not sure
> that these are intended and may be I need a system property named
> "java.nio.channels.spi.SelectorProvider" to ensure some other
> SelectorProvider and therefore different ServerSocketChannel and
> ServerSocket types.
> 
> public class TribalAfiliations{
>  Channel myChannel;
>  private static class MyMemberListener implements MembershipListener{...}
>  private static class MyMessageListener implements ChannelListener{...}
> 
>  TribalAfiliations() throws SocketException{
>  this.myChannel=new GroupChannel();
>  ChannelListener msgListener = new TribalAfiliations.MyMessageListener();
>  MembershipListener mbrListener = new TribalAfiliations.MyMemberListener();
>  myChannel.addMembershipListener(mbrListener);
>  myChannel.addChannelListener(msgListener);
>    try{
> 
> myChannel.start(Channel.MBR_TX_SEQ|Channel.MBR_RX_SEQ|Channel.SND_TX_SEQ|Channel.SND_RX_SEQ);
>    /// same problem, with    myChannel.start(Channel.DEFAULT);
>    }
>    catch(ChannelException e){
>    System.out.println(e.getMessage());
>    }
>  }
> 
> 
> 
> 
> 
> 


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