I want to send a file from one agent to an other agent?

Question

I want to send file fron one agent to an other agent using JADE on same PC. Here some error which is occur during execution.

***  Uncaught Exception for agent a  ***
ERROR: Agent a died without being properly terminated !!!
java.lang.RuntimeException: Uncompilable source code - incompatible types: java.lang.String cannot be converted to byte[]
State was 2
ERROR: Agent b died without being properly terminated !!!
State was 2
    at sendmessage.A.sendMessage(A.java:36)
    at sendmessage.A.setup(A.java:25)
    at jade.core.Agent$ActiveLifeCycle.init(Agent.java:1490)
    at jade.core.Agent.run(Agent.java:1436)
    at java.lang.Thread.run(Thread.java:745)
Nov 20, 2015 4:21:34 PM jade.core.messaging.MessagingService removeLocalAliases
INFO: Removing all local alias entries for agent a
Nov 20, 2015 4:21:34 PM jade.core.messaging.MessagingService removeGlobalAliases
INFO: Removing all global alias entries for agent a
***  Uncaught Exception for agent b  ***
java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: sendmessage.B.MyBehaviour.receive
    at sendmessage.B$MyBehaviour.action(B.java:40)
    at jade.core.behaviours.Behaviour.actionWrapper(Behaviour.java:344)
    at jade.core.Agent$ActiveLifeCycle.execute(Agent.java:1500)
    at jade.core.Agent.run(Agent.java:1439)
    at java.lang.Thread.run(Thread.java:745)
Nov 20, 2015 4:21:34 PM jade.core.messaging.MessagingService removeLocalAliases
INFO: Removing all local alias entries for agent b
Nov 20, 2015 4:21:34 PM jade.core.messaging.MessagingService removeGlobalAliases
INFO: Removing all global alias entries for agent b
Nov 20, 2015 4:21:42 PM jade.core.messaging.MessagingService removeLocalAliases
INFO: Removing all local alias entries for agent rma
Nov 20, 2015 4:21:42 PM jade.core.messaging.MessagingService removeGlobalAliases
INFO: Removing all global alias entries for agent rma

Sender:Who send file to another agent via using JADE. package sendmessage;

import jade.core.AID;
import jade.core.Agent;
import jade.core.behaviours.Behaviour;
import jade.lang.acl.ACLMessage;
import jade.lang.acl.MessageTemplate;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 *
 * @author Administrator
 */
public class A extends Agent {

    protected void setup() {
        sendMessage();
        this.addBehaviour(new MyBehaviour(this));
    }

    private void sendMessage() {
        AID r = new AID("b", AID.ISLOCALNAME);
//        ACLMessage acl = new ACLMessage(ACLMessage.REQUEST);
//        acl.addReceiver(r);
//        acl.setContent("hello, my name is sender!");
//        this.send(acl);
        String fileName = "a.txt";// get file name
        byte[] fileContent = "f://a.txt";// read file content
        ACLMessage msg = new ACLMessage(ACLMessage.INFORM);
        msg.addReceiver(r);
        msg.setByteSequenceContent(fileContent);
        msg.addUserDefinedParameter("file-name", fileName);
        send(msg);
    }

    private static class MyBehaviour extends Behaviour {

        MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.INFORM);
        private static int finish;

        public MyBehaviour(A aThis) {
        }

        @Override
        public void action() {
            ACLMessage acl = myAgent.receive(mt);
            if (acl != null) {
                System.out.println(myAgent.getLocalName() + " received a reply: " + acl.getContent() + "from " + acl.getSender());
                finish = 1;
            } else {

                this.block();
            }
        }

        @Override
        public boolean done() {
            return finish == 1;
        }

    }
}

Receiver: who receive file from send agent via using JADE

package sendmessage;

import jade.core.Agent;
import jade.core.behaviours.Behaviour;
import jade.lang.acl.ACLMessage;
import jade.lang.acl.MessageTemplate;
import java.io.File;

/**
 *
 * @author Administrator
 */
public class B extends Agent {

    protected void setup() {
        this.addBehaviour(new MyBehaviour(this));
    }

    private static class MyBehaviour extends Behaviour {
        MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.REQUEST);
        public MyBehaviour(B aThis) {

        }

        @Override
        public void action() {
//            ACLMessage acl = myAgent.receive(mt);
//            if (acl!= null) {
//                System.out.println(myAgent.getLocalName()+ " received a message: "+acl.getContent());
//                ACLMessage rep = acl.createReply();
//                rep.setPerformative(ACLMessage.INFORM);
//                rep.setContent("ok, i received a message!");
//                myAgent.send(rep);

        ACLMessage msg = receive("Yes Received your file");
                if (msg != null) {
                  String fileName = msg.getUserDefinedParameter("a.txt");
                  File f = "a.txt"; // create file called fileName
                  byte[] fileContent = msg.getByteSequenceContent();
                  // write fileContent to f
                }
             else {
                this.block();
            }
        }
        @Override
        public boolean done() {
            return false;
        }
    }
}

Answer 1

It is probably an idea to create an Ontology for your agent system if you are going to be exchanging files around alot. JADE offers the ability to use OntologyBean classes as representation of the Agent communication methods(which really simplifies things).

the BeanOntology class adds custom language in the form of predicates, concepts, etc. Inside these custom language descriptions you can place an object and any other information you may want to specify alongside it. It is actually quite simple if you follow the documentation provided from JADE --> tutorial here

good luck!