About Java RMI

poeta_boy · 01-27-2004, 11:56 AM

Hello:

I fullinstalled Mandrake 9.2 and it came with a java compiler. I'm not sure if it's Sun's official compiler but it does the trick.

I wrote this little example of a distributed object Using RMI, I did:

public interface Calculator extends java.rmi.Remote
{
public long add(long a, long b) throws java.rmi.RemoteException;
public long sub(long a, long b) throws java.rmi.RemoteException;
public long mul(long a, long b) throws java.rmi.RemoteException;
public long div(long a, long b) throws java.rmi.RemoteException;

}

And it's implementation:

public class CalculatorImpl extends java.rmi.server.UnicastRemoteObject implements Calculator
{
public CalculatorImpl() throws java.rmi.RemoteException
{ super(); }
public long add(long a, long b) throws java.rmi.RemoteException
{ return a+b;}
public long sub(long a, long b) throws java.rmi.RemoteException
{ return a-b; }
public long mul(long a, long b) throws java.rmi.RemoteException
{ return a*b; }
public long div(long a, long b) throws java.rmi.RemoteException
{ return a/b; }
}

I did javac on Both and it goes fine.

However when I rmic on CalculatorImpl it says:

java.lang.ClassNotFoundException: CalculatorImpl
at java.lang.Class.forName (Class.java)
at java.lang.Class.forName (Class.java:44)
at kaffe.rmi.rmic.RMIC.findClass (RMIC.java:149)
at kaffe.rmi.rmic.RMIC.analyzeClass (RMIC.java:115)
at kaffe.rmi.rmic.RMIC.processClass (RMIC.java:84)
at kaffe.rmi.rmic.RMIC.run (RMIC.java:73)
at kaffe.rmi.rmic.RMIC.main (RMIC.java:52)

could it be because of the compiler? Any ideas?
Thanks!!!

acjt · 01-27-2004, 12:30 PM

Hi,
You have to do more than just compile the 'Calculator' classes. You should just do a little more reading on RMI, and find out about starting the rmi server (general terms of course).
Perhaps check out this as a starter: http://java.sun.com/docs/books/tutor...lementing.html

poeta_boy · 01-27-2004, 01:13 PM

I do have the server and client classes..... but the error is the same. Perhaps on the same dir the client and server?

what's the error about?

BTW Great link thanks a lot!

acjt · 01-27-2004, 02:16 PM

Check that your classpath is set properly, I think I started down the wrong path, because the Impl file is the problem.

poeta_boy · 01-27-2004, 02:18 PM

but shouldn¿t the class be ok if it compiles correctly with javac? isn¿t all bin directory especified?