Problems loading an applet:(
Hello!
I am an italian student who is attending computer science at Pisa University.
I am developing a project and I have the following problem.
I have written an applet that import the following libraries with the statements:
import java.io.*;
import java.net.URL;
import java.net.*;
import java.applet.Applet;
import java.awt.*;
// Api that implement cryptographic functionalities written by IAIK
import iaik.java.security.Security;
import iaik.java.security.SecureRandom;
import iaik.java.security.NoSuchAlgorithmException;
import iaik.java.security.InvalidKeyException;
import iaik.java.security.NoSuchProviderException;
import iaik.java.security.KeyPair;
import iaik.java.security.KeyPairGenerator;
import javax.crypto.Cipher;
import iaik.security.provider.*;
import iaik.security.rsa.*;
import iaik.java.security.Provider;
// I have witten the following packages:
import Borsa.*;
import supporto.*;
When I load the Web Page that contains tha applet and I receive the following error in the Java console:
java.lang.NoClassDefFoundError: Borsa/Cliente
at java/lang/Class.getFields0
at java/lang/Class.getDeclaredFields
at java/io/ObjectStreamClass.generateSerialVersionUID
at java/io/ObjectStreamClass.<init>
at java/io/ObjectStreamClass.lookup
at java/io/ObjectOutputStream.writeNewObject
at java/io/ObjectOutputStream.writeObject
at RefreshSSL.mandaRich
at RefreshSSL.InitSSL
at RefreshSSL.init
at com/ms/applet/AppletPanel.securedCall0
at com/ms/applet/AppletPanel.securedCall
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
The web browser doesn't let me to download the class "Cliente" that is present in the package "Borsa" that I have written (together with the package "supporto"), but I don't know why!
I am using Windows ME as Operating System, Internet Explorer 5.5 as Web Browser, Apache 1.3.2 (for Windows) as HTTP Server.
I have some questions:
1)Does the Web Browser allow me to download all the code (classes) of the packages that the applet needs to work?
I suspect that the Web Browser let me to download only the code of the applet and not the code of all classes files that it imports.
2) In this case: what does a user have to do to download correctly the applet?
Does he must have stored on his PC all the classes that applet needs (that is to say they must be stored on the client side of the application) without downloading them?
I think it is impossible because a programmer that writes an application must store all his code only on an Http Server and not on all the client machine!! Are you agree?
I tried to set the classpath variable in Windows with the location of the "Borsa" package but unsuccessful.Anyway even if this solution worked I think it wouldn't be a good one because
the user shouldn't modify his environment variables and then he doesn't have the code of the classes that the applet imports:(
I PRAY YOU TO REPLY ME TO THIS E-MAIL ADDRESS:
ventura@cli.di.unipi.it
Thanks a lot to all in advance!
Luca Ventura
