Network test problem

Troubleshooting spidermonkey
1

Hi

I think in jme3test.network.TestHostDiscovery doesn’t work line

[java]

List hosts = client.discoverHosts(5110, 5000);

[/java]

doesn’t work.

Here is exception

[java]

Exception in thread “main” java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

at java.util.ArrayList.RangeCheck(Unknown Source)

at java.util.ArrayList.get(Unknown Source)

at networking.TestHostDiscovery.main(TestHostDiscovery.java:55)

[/java]

2

Oh, I’m sorry!!!

jme3test.network.TestHostDiscovery doesn’t work, but the method client.discoverHosts() works on different computers. May be it doesn’t look for “localhost”???

3

If you have a firewall on your PC, it might be blocking outbound broadcast packets, so the List will be empty.

4

Thank you. I’ve totally forgot about firewall.

5

The same test

[java]

import com.jme3.network.connection.Client;

import com.jme3.network.connection.Server;

import java.io.IOException;

import java.net.InetAddress;

import java.util.List;



public class TestHostDiscovery {

public static void main(String[] args) throws IOException, InterruptedException{

Server server = new Server(5110, 5110);

server.start();



Client client = new Client();

client.start();



List hosts = client.discoverHosts(5110, 5000);

for (InetAddress host : hosts){

System.out.println("Found host: " + host);

System.out.println("Reachable? " + host.isReachable(5000));

}



System.out.println("Connecting to: "+ hosts.get(0));

client.connect(hosts.get(0).getCanonicalHostName(), 5110, 5110);

Thread.sleep(500);

System.out.println(server.getConnectors().size());// Why an output is 0?

}

}

[/java]

Why an output is 0?

6

I assume it actually found a host now?

7

Lets look to following codes

[java]

import java.net.InetAddress;

import java.util.List;

import com.jme3.network.connection.Client;

import com.jme3.network.connection.Server;



public class TestSearchConnection{



public static void main(String[] args) throws Exception{

Server server = new Server(2911, 2911);

server.start();



Client client = new Client();

client.start();



List hosts = client.discoverHosts(2911, 5000);

for (InetAddress host : hosts){

System.out.println("Found host: " + host); // Found host: /192.168.1.3

System.out.println("Reachable? " + host.isReachable(5000)); // Reachable? true

}



System.out.println("Connecting to: "+ hosts.get(0));

client.connect(hosts.get(0).getCanonicalHostName(), 2911, 2911); // Connecting to: /192.168.1.3



Thread.sleep(1000);



System.out.println(server.getConnectors().size()); // 0

System.out.println(server.getTCPConnectors().size()); // 1

System.out.println(server.getUDPConnectors().size()); // 0

}

}

[/java]



and this



[java]

import com.jme3.network.connection.Client;

import com.jme3.network.connection.Server;



public class TestAddressConnection{

public static void main(String args[]) throws Exception{

Server server = new Server(2911, 2911);

server.start();



Client client = new Client(“127.0.0.1”, 2911, 2911);

client.start();



Thread.sleep(1000);



System.out.println(server.getConnectors().size()); // 1

System.out.println(server.getTCPConnectors().size()); // 1

System.out.println(server.getUDPConnectors().size()); // 1

}

}

[/java]



In the first i had output

[java]

…

Found host: /192.168.1.3

Reachable? true

Connecting to: /192.168.1.3

…

0

1

0

[/java]



Means that if I am able to send message only by TCP connection.

And in the second

[java]

…

1

1

1

[/java]



I can use TCP, UDP and combined connection. I thought the first and the second ought to be the same thing.

Am I doing something wrong?

8

Something strange is happening…



[java]

import com.jme3.network.connection.Client;

import com.jme3.network.connection.Server;



public class TestAddressConnection{

public static void main(String args[]) throws Exception{

Server server = new Server(2911, 2911);

server.start();



Client client = new Client(“192.168.1.3”, 2911, 2911);

client.start();



Thread.sleep(1000);



System.out.println(server.getConnectors().size());

System.out.println(server.getTCPConnectors().size());

System.out.println(server.getUDPConnectors().size());

}

}

[/java]



The output is



[java]

1

1

1

[/java]



Now I try to pass an address in constructor.



[java]

import java.net.InetAddress;

import java.util.List;

import com.jme3.network.connection.Client;

import com.jme3.network.connection.Server;



public class TestSearchConnection{



public static void main(String[] args) throws Exception{

Server server = new Server(2911, 2911);

server.start();



Client client = new Client(); //Do not start

List hosts = client.discoverHosts(2911, 5000);



Client cli = new Client(hosts.get(0).getHostAddress(), 2911, 2911);

cli.start();



Thread.sleep(1000);



System.out.println(hosts.get(0).getHostAddress());



System.out.println(server.getConnectors().size());

System.out.println(server.getTCPConnectors().size());

System.out.println(server.getUDPConnectors().size());

}

}

[/java]



Output

[java]

192.168.1.3

0

1

0

[/java]