vj#: Hello,
We are trying to migrate a very very big project from Java Applets to
JBC.
I'm haveing bad time with Class.forName. What ever I try (even in very
simple demo) I just keep getting "ClassNotFound" exceptions.

I've read all the articals but I just cannot get it to work.

Any Ideas?

Thanks,
Udi Zisser
Netmanage Inc.
udi@netmanage.co.il

Udi,

I have tried the "very simple demo" below:

==== Begin PlugIn.java =================================================

package test;

public interface PlugIn {
void run(TestApplet applet);
}

==== End PlugIn.java ===================================================

==== Begin TestApplet.java =============================================

package test;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class TestApplet extends Applet {
Label label;
public int counter;

public void init() {
label = new Label("0");
add(label);

Button button = new Button("Go");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
go();
}
});
add(button);
}

void go() {
try {
Class plugInClass = Class.forName("test.TestPlugIn");
PlugIn plugInObject = (PlugIn) plugInClass.newInstance();
plugInObject.run(this);
label.setText(String.valueOf(counter));
} catch (Exception ex) {
label.setText(ex.toString());
}
}
}

==== End TestApplet.java ===============================================

==== Begin TestPlugIn.java =============================================

package test;

public class TestPlugIn implements PlugIn {
public void run(TestApplet applet) {
applet.counter++;
}
}

==== End TestPlugIn.java ===============================================

It runs perfectly on my system. Does it also run on your system?

If so, how does your very simple demo differ from this one?

Greetings

Bart Jacobs

Udi,

In my previous posting, I forgot to mention a very important point: I
compiled all three classes into the same assembly. That is, I used the
following compiler command:

vjc /target:library /out:TestApplet.dll *.java

The demo works only if TestPlugIn and TestApplet are in the same
assembly. This is because the J# version of Class.forName(String) looks
only in the assembly that contains the call of Class.forName.

If you want to load the plug-in from a different assembly, say
TestPlugIn.dll, then use the following code:

Class plugInClass =
Class.FromType(System.Type.GetType("test.TestPlugIn, TestPlugIn"));

and compile the demo as follows:

vjc /t:library /out:TestApplet.dll PlugIn.java TestApplet.java
vjc /t:library /out:TestPlugIn.dll /r:TestApplet.dll TestPlugIn.java

Greetings

Bart Jacobs

Thanks for the reply.
when we use Class.forName most of the time we will use it like the
second post. So I guess I have to read some more about
"Class.FromType".
Anyway, I've managed to get it to work using statments like:
Class tempClass = Class.forName("http://localhost/test/MFDharness.dll",param,true);

I still can't get the JBC to locate the .dll using the app.config file
(probing or appdomain)

Thanks,
Udi Zisser
NetManage Inc.

------
[quoted text, click to view]