[erlang-questions] Naive questions about jinterface

Dmitrii Dimandt <>
Tue Aug 12 09:07:18 CEST 2008


On Aug 11, 2008, at 5:14 PM, Dennis Byrne wrote:

>
> Hi Dmitrii,
>
> The approach taken in the article is one of two ways to go about  
> using jinterface.  The other way is covered pretty well by these  
> slides from this years' Erlang eXchange conference.   This approach  
> is much more mailbox centric.
>
> http://people.apache.org/~dennisbyrne/erlang_exchange/erlang_exchange_jinterface.ppt


Yup, I've seen this one as well. It's excellent in showing how you can  
implement erlang's features using jinterface, but I'm still a bit  
lost :) (yeah, yeah, I'm stupid and stupid enough to admit it :) )

So, I've created this java class:

import com.ericsson.otp.erlang.*;

public class ServerNode {

	public static void main (String[] _args) throws Exception{
		OtpNode self = new OtpNode("", "cookie");
		OtpMbox mbox = self.createMbox("jimbox");
	
		OtpErlangObject o;
		OtpErlangTuple msg;
		OtpErlangPid from;
		
		while (true) {
			try {
				o = mbox.receive();
				if (o instanceof OtpErlangTuple) {
					msg = (OtpErlangTuple)o;
					from = (OtpErlangPid)(msg.elementAt(0));
					mbox.send(from,msg.elementAt(1));
				}
			}catch (Exception e) {
				System.out.println("" + e);
			}
		}
	}

}



Now it is my understanding that if I start erl with:
erl -name  -setcookie cookie

I can send messages to the Java node like this:
{echo, ''} ! {self(), msg}

However, this message never reaches the java node :( Even though  
net_adm:ping('') returns pong

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