Yasumasa, The CR number is JDK-8057556 I'll care about it's integration. -Dmitry On 2014-09-02 18:52, Yasumasa Suenaga wrote:
Hi all,
I'm trying to use JDP on my Fedora20 machine. My machine has two NICs and only one NIC is up.
I passed system properties as below, however JDP broadcaster thread was not started:
-Dcom.sun.management.jmxremote.port=7091 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.autodiscovery=true -Dcom.sun.management.jdp.name=TEST
I checked exceptions with jdb, SocketException was occurred in JDPControllerRunner#run(), and it was caused by another NIC is down.
Currently, DiagramChannel which is used in JDPBroadcaster tries to send JDP packet through all "UP" NICs. However, NIC which is controlled by NetworkManager seems to be still "UP" when ifdown command is executed. (It seems to be removed IP address from NIC only.)
This problem may be Fedora, however I think it should be improved in JDK. I've created a patch as below, and it works fine in my environment. (jdk9/dev/jdk)
If this patch may be accepted, I will file this to JBS.
-------------------- diff -r 68a6bb51cb26 src/java.management/share/classes/sun/management/jdp/JdpBroadcaster.java --- a/src/java.management/share/classes/sun/management/jdp/JdpBroadcaster.java Mon Sep 01 13:33:28 2014 +0200 +++ b/src/java.management/share/classes/sun/management/jdp/JdpBroadcaster.java Tue Sep 02 23:25:50 2014 +0900 @@ -35,6 +35,7 @@ import java.nio.ByteBuffer; import java.nio.channels.DatagramChannel; import java.nio.channels.UnsupportedAddressTypeException; +import java.util.Enumeration;
/** * JdpBroadcaster is responsible for sending pre-built JDP packet across a Net @@ -79,6 +80,15 @@ if (srcAddress != null) { // User requests particular interface to bind to NetworkInterface interf = NetworkInterface.getByInetAddress(srcAddress); + + if (interf == null) { + throw new JdpException("Unable to get network interface for " + srcAddress.toString()); + } + + if (!interf.isUp() || !interf.supportsMulticast()) { + throw new JdpException(interf.getName() + " does not support multicast."); + } + try { channel.bind(new InetSocketAddress(srcAddress, 0)); } catch (UnsupportedAddressTypeException ex) { @@ -86,6 +96,23 @@ } channel.setOption(StandardSocketOptions.IP_MULTICAST_IF, interf); } + else { + Enumeration<NetworkInterface> nics = NetworkInterface.getNetworkInterfaces(); + while (nics.hasMoreElements()) { + NetworkInterface nic = nics.nextElement(); + + if (nic.isUp() && nic.supportsMulticast()) { + try { + channel.setOption(StandardSocketOptions.IP_MULTICAST_IF, nic); + } catch (IOException ex) { + System.err.println("WARNING: JDP broadcaster cannot use " + nic.getName() + ": " + ex.getMessage()); + } + } + + } + + } + }
/** --------------------
Thanks,
Yasumasa
-- Dmitry Samersoff Oracle Java development team, Saint Petersburg, Russia * I would love to change the world, but they won't give me the sources.