I just upgraded to 2.5.0.4 and this error seems to have gone away.  2.5.0.4
should show up in Extras in a few days.

(In reply to comment #1)
> I just upgraded to 2.5.0.4 and this error seems to have gone away.  2.5.0.4
> should show up in Extras in a few days.

Me too (Source RPM: azureus-2.5.0.4-2.fc7.src.rpm). But unfortunately the bug 
is still here. 

(i have two interface one for the locale net and one for the internet with
public ip. can it cause the error?)

The azureus version i downloaded from sourceforge works fine.

I'm seeing this too and I have a reduced test case.
The bug seems to be a simple oversight in libgcj's
SocketChannelImpl.

import java.nio.channels.*;
import java.net.*;

public class Q {
  public static void main(String[] args) throws Throwable {
    SocketChannel sc = SocketChannel.open();
    sc.socket().setReceiveBufferSize(4096);
    sc.socket().setSendBufferSize(4096);
    sc.socket().setReuseAddress(true);
    sc.socket().bind(new InetSocketAddress(9095));
    sc.configureBlocking(false);
  }
}

I've checked in a fix for this to GCC trunk.
I also put it on the RH 4.1 branch.
I'm not sure when this will end up in Rawhide, but I assume
relatively soon.  It is r123441 on the branch.

(In reply to comment #4)
> I've checked in a fix for this to GCC trunk.
> I also put it on the RH 4.1 branch.
> I'm not sure when this will end up in Rawhide, but I assume
> relatively soon.  It is r123441 on the branch.

yum updated the libgcj package today, so i checked it again.
(gcc-4.1.2-8.src.rpm)

Azureus still dont downloading, the exception is changed to this:


DEBUG::Thu Apr 05 19:02:41 GMT+02:00
2007::com.aelitis.azureus.core.networkmanager.impl.tcp.VirtualBlockingServerChannelSelector::accept_loop::-1:
    VirtualBlockingServerChannelSelector$1::runSupport::-1,AEThread::run::-1
java.lang.NullPointerException
   at gnu.java.nio.ServerSocketChannelImpl.accept(libgcj.so.8rh)
   at
com.aelitis.azureus.core.networkmanager.impl.tcp.VirtualBlockingServerChannelSelector.accept_loop(Azureus2.jar.so)
   at
com.aelitis.azureus.core.networkmanager.impl.tcp.VirtualBlockingServerChannelSelector$1.runSupport(Azureus2.jar.so)
   at org.gudy.azureus2.core3.util.AEThread.run(Azureus2.jar.so)
DEBUG::Thu Apr 05 19:02:42 GMT+02:00
2007::com.aelitis.azureus.core.versioncheck.VersionCheckClient::preProcessReply::-1:
  com.aelitis.azureus.core.networkmanager.admin.NetworkAdminException: DNS query
failed
   at
com.aelitis.azureus.core.networkmanager.admin.impl.NetworkAdminASNLookupImpl.lookupDNS(Azureus2.jar.so)
   at
com.aelitis.azureus.core.networkmanager.admin.impl.NetworkAdminASNLookupImpl.lookupDNS(Azureus2.jar.so)
   at
com.aelitis.azureus.core.networkmanager.admin.impl.NetworkAdminASNLookupImpl.<init>(Azureus2.jar.so)
   at
com.aelitis.azureus.core.networkmanager.admin.impl.NetworkAdminImpl.lookupASN(Azureus2.jar.so)
   at
com.aelitis.azureus.core.versioncheck.VersionCheckClient.preProcessReply(Azureus2.jar.so)
   at
com.aelitis.azureus.core.versioncheck.VersionCheckClient.executeHTTP(Azureus2.jar.so)
   at
com.aelitis.azureus.core.versioncheck.VersionCheckClient.performVersionCheck(Azureus2.jar.so)
   at
com.aelitis.azureus.core.versioncheck.VersionCheckClient.getVersionCheckInfoSupport(Azureus2.jar.so)
   at
com.aelitis.azureus.core.versioncheck.VersionCheckClient.getExternalIpAddress(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZMyInstanceImpl.readExternalAddress(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZMyInstanceImpl.getExternalAddress(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceImpl.encode(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl.sendMessage(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl.sendMessage(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl$request.<init>(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl.sendRequest(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl.search(Azureus2.jar.so)
   at
com.aelitis.azureus.core.instancemanager.impl.AZInstanceManagerImpl$4.runSupport(Azureus2.jar.so)
   at org.gudy.azureus2.core3.util.AEThread.run(Azureus2.jar.so)
Caused by: javax.naming.NoInitialContextException: Can't load
InitialContextFactory class: com.sun.jndi.dns.DnsContextFactory caused by
java.lang.ClassNotFoundException: com.sun.jndi.dns.DnsContextFactory not found
in
gnu.gcj.runtime.SystemClassLoader{urls=[file:/usr/lib64/eclipse/swt-gtk-3.2.jar,file:/usr/share/java/bcprov.jar,file:/usr/share/java/jakarta-commons-cli.jar,file:/usr/share/java/log4j.jar,file:/usr/share/java/gtk2.8.jar,file:/usr/share/java/glib0.2.jar,file:/usr/share/azureus/Azureus2.jar],
parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at javax.naming.spi.NamingManager.getInitialContext(libgcj.so.8rh)
   at javax.naming.InitialContext.getDefaultInitCtx(libgcj.so.8rh)
   at javax.naming.InitialContext.getURLOrDefaultInitCtx(libgcj.so.8rh)
   at
javax.naming.directory.InitialDirContext.getURLOrDefaultInitDirCtx(libgcj.so.8rh)
   at javax.naming.directory.InitialDirContext.getAttributes(libgcj.so.8rh)
   at
com.aelitis.azureus.core.networkmanager.admin.impl.NetworkAdminASNLookupImpl.lookupDNS(Azureus2.jar.so)
   ...18 more

I'm WONTFIXing this.  Please run azureus with IcedTea.  Thanks!