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| Guest |
 Posted: Tue Nov 20, 2007 5:35 am |
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Guest
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I'm attempting to get some of my code running on a JVM to connect to
my erlang cluster using the jinterface package. On a single computer,
I have the following two erlang sessions running happily in different
terminals:
=========
erl -setcookie foo -sname real
Erlang (BEAM) emulator version 5.5.5 [source] [async-threads:0] [hipe]
[kernel-poll:false]
Eshell V5.5.5 (abort with ^G)
(real@macbeth)1>
==========
rl -setcookie foo -sname test
Erlang (BEAM) emulator version 5.5.5 [source] [async-threads:0] [hipe]
[kernel-poll:false]
Eshell V5.5.5 (abort with ^G)
(test@macbeth)2> node().
test@macbeth
(test@macbeth)10> net_adm:ping('test@macbeth').
pong
(test@macbeth)11> net_adm:ping('real@macbeth').
pong
(test@macbeth)12> net_adm:ping('blah@macbeth').
pang
==========
So, the erlang nodes seem happy to talk to each other (at least ping
works). So, in my JVM I'm trying to create a connection to the same
cluster (using JRuby for an interactive session):
===========
CLASSPATH=/usr/lib/erlang/lib/jinterface-1.3/priv/OtpErlang.jar:$CLASSPATH jirb
irb(main):001:0> require 'java'
=> true
irb(main):003:0> import 'com.ericsson.otp.erlang.OtpNode'
=> ["com.ericsson.otp.erlang.OtpNode"]
irb(main):004:0> OtpNode.new('blah', 'foo')
NativeException: java.io.IOException: Nameserver not responding on
localhost when publishing blah
from OtpEpmd.java:327:in `com.ericsson.otp.erlang.OtpEpmd.r3_publish'
from OtpEpmd.java:119:in `com.ericsson.otp.erlang.OtpEpmd.publishPort'
from OtpNode.java:645:in
`com.ericsson.otp.erlang.OtpNode$Acceptor.publishPort'
from OtpNode.java:638:in
`com.ericsson.otp.erlang.OtpNode$Acceptor.<init>'
from OtpNode.java:136:in `com.ericsson.otp.erlang.OtpNode.init'
...
=========
So, it seems to think epmd isn't there. Erlang processes have no
trouble connecting, so I'm wondering if I need to set some
environmental variable to tell the JVM where epmd is listening, or
what. Any ideas?
My java -version is:
java version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)
And I'm running under Gentoo Linux kernel 2.6.21.
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| vladdu |
| Posted: Tue Nov 20, 2007 7:51 am |
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Joined: 28 Feb 2005
Posts: 397
Location: Gothenburg, Sweden
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Hi!
On Nov 20, 2007 6:28 AM, tsuraan <tsuraan@gmail.com> wrote:
> (real@macbeth)1>
...
> NativeException: java.io.IOException: Nameserver not responding on
> localhost when publishing blah
Maybe this is the issue? The Java node looks on localhost and the
others on macbeth? Check your .hosts file and the network interfaces
setup.
You can debug the jinterface side by defining -DOtpConnection.trace=4
and epmd by starting it manually (after killing the existing one) with
"epmd -d -d -d" in another console.
best regards,
Vlad
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| Guest |
| Posted: Tue Nov 20, 2007 3:40 pm |
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Guest
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> Maybe this is the issue? The Java node looks on localhost and the
> others on macbeth? Check your .hosts file and the network interfaces
> setup.
Yup, hosts it was; I used to have functional DNS here, but my
firewall's under construction so I don't anymore; I forgot that erlang
liked having names be useful 
>
> You can debug the jinterface side by defining -DOtpConnection.trace=4
> and epmd by starting it manually (after killing the existing one) with
> "epmd -d -d -d" in another console.
Thanks for the advice!
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| wuji |
| Posted: Sat Aug 18, 2012 8:19 am |
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| mbtshoes88 |
| Posted: Tue Sep 18, 2012 8:39 am |
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