Client

[Ritchie Partridge]

Not sure if this the correct forum but i'm trying to write a client which connects to a server and implements an interface ie.formal.one.Connection. The client should send and recieve bytes to request contains of files and directories. The code isn't complete, but the main problem is that when i connect to the server it can't find the correct classes.

import java.io.*;
import java.net.*;

public class Connection
{
static Conn c = new Conn();
    public static void main(String[] args) throws Exception 
{  
String fromServer;
String fromUser;
byte inputByte;
DataOutput byteOut;
DataInput byteIn = null;
String inputUTF, outputUTF;
String filename=null;
String username,password;
while ((inputByte = byteIn.readByte()) != 0) 
{
if(inputByte==c.Open_Request)// Open Request
{
c.open(args[4], 8010,"anne","password");
}
else if(inputByte==c.Open_Response)//Open response
{
System.out.println("127.0.0.1");
}
else if(inputByte==c.Close_Request)//Close Request
{
c.close();
}
else if(inputByte==c.Directory_Request)//Directory Request
{
c.directory();
}
else if(inputByte==c.File_Request)//File Request
{
c.file(filename);
}
else if(inputByte==c.File_Response)//File Response
{
System.out.println("file");
}
else if(inputByte==c.Error)//Error Response
System.out.println("Error");
}
}
}
class Conn implements ie.formal.one.Connection
{
Socket socket = null;
PrintWriter out = null;
BufferedReader in = null;
public String open(String address, int port,String name, String password) throws Exception
{
        try 
{
            socket = new Socket(address, port);
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        } 
catch (UnknownHostException e) 
{
            System.err.println("Cannot connect to server");
            System.exit(1);
        } 
catch (IOException e) 
{
            System.err.println("Couldn't get I/O for the connection to server.");
            System.exit(1);
        }
return "";
}
public void close() throws Exception
{
try 
{  
out.close();
        in.close();
socket.close();
}
catch (Exception e) 
{
            System.err.println("Error"+e);
            System.exit(1);
        } 

}
public String[] directory() throws Exception
{
String [] dir = {"",""};
return dir;
}
public String file(String filename) throws Exception
{
String file ="";
return file;
}
};

[Joe Ess]

Originally posted by Ritchie Partridge:
the main problem is that when i connect to the server it can't find the correct classes.

Do you mean you get a "ClassNotFound" exception? That's an issue with the Classpath. You need either the directory where the runtime could find the path ie/formal/one/Connection.class or the JAR file where Connection.class is stored in your classpath.

[Ritchie Partridge]

I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: ie/formal/part1/Conne
ction (wrong name: Connection)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at ie.formal.one.Part1Tester.main(Unknown Source)
As far as i can see i have the files in the correct directories, in fact i've put them in the root directory and the ie/formal/one directory

[Joe Ess]

Originally posted by Ritchie Partridge:
Exception in thread "main" java.lang.NoClassDefFoundError: ie/formal/part1/Connection (wrong name: Connection)

Does your class Connection above have a "package ie.formal.part1" statement in it? Sounds like the class is being found in the ie/formal/part1 directory, but it's declared to be in the root level package.

[Ritchie Partridge]

I have the following two jar files and i HAVE to test them using the following line:
java -cp formal.jar;part2.jar ie.formal.two.Part2Tester <server> <port>
C:\>jar tf formal.jar
META-INF/
META-INF/MANIFEST.MF
ie/
ie/formal/
ie/formal/ca555/
ie/formal/ca555/KeyStore.class
ie/formal/common/
ie/formal/common/Base64Decoder.class
ie/formal/common/Base64Encoder.class
ie/formal/common/CA.class
ie/formal/common/Commands.class
ie/formal/common/Console.class
ie/formal/common/Debug.class
ie/formal/common/Decode.class
ie/formal/common/GetDialog.class
ie/formal/common/NewDialog.class
ie/formal/common/Password$Validate.class
ie/formal/common/Password.class
ie/formal/common/Version.class
ie/formal/common/Warning.class
ie/formal/one/
ie/formal/one/Connection.class
ie/formal/one/Part1Tester.class
ie/formal/two/
ie/formal/two/Connection.class
ie/formal/two/Part2Tester.class
C:\>jar tf part1.jar
META-INF/
META-INF/MANIFEST.MF
Connection/Conn.class
Connection/Connection.class

[Joe Ess]

Originally posted by Ritchie Partridge:

C:\>jar tf part1.jar
META-INF/
META-INF/MANIFEST.MF
Connection/Conn.class
Connection/Connection.class

The Connection.class above is the one you posted? Again, you don't have a package statement. First line in the file should be "package Connection".

[Ritchie Partridge]

Sorry, i do have that included since, thanks, still doesn't help though, think it's to do with the classpaths when i create the jar file