starting a Swing application from an applet

[FakeRabbit]

Hi,

I wrote an application in netbeans using the Swing Application Framework and now I would like to write an applet with a button starting this application. The problem is, that when I run this applet I get the following error:

java.lang.NoClassDefFoundError: org/jdesktop/application/SingleFrameApplication

here's the html file:

<APPLET codebase="classes" code="adminpanel/Admin.class" 
 width=50 height=200>
</APPLET>

...and the applet code (the button is not yet here):

public class Admin extends JApplet{
    private JButton guzik;

    @Override
    public void init(){
        setLayout(new FlowLayout(FlowLayout.CENTER));
        
        AdminPanelApp.launch(AdminPanelApp.class, null);
        }}

[Nicholas Jordan]

type appletviewer: as the protocol

put it in the browser address bar where http normally goes

also, the slashes in the name path somehow are the same as the dots in filename, pathnames. Have not figured it out but it shows in the paths you are posting.

[Norm]

org/jdesktop/application/SingleFrameApplication

The JVM can't find that class
Where is the above reference class located? Probably in a jar file. Find that jar file, copy it to the folder with the HTML file and add archive=<jarfile> to the <APPLET tag

[FakeRabbit]

Thanks for the reply.

So I found the appframework-1.0.3.jar in dist/lib folder and copied it into the build folder, where my html is located. I edited the html file:

<APPLET codebase="classes" code="adminpanel/Admin.class" 
ARCHIVE="appframework-1.0.3.jar"
width=350 height=200></APPLET>

Still the same error I'm afraid.

type appletviewer: as the protocol

put it in the browser address bar where http normally goes

sorry, but I don't understand. What do I have to put in the addres bar and where do I type "appletviewer: as the protocol"?

[Norm]

How are you loading the html into the browser? Directly by clicking on the html or via a server?
Can you post the full contents of the error message in the Java Console?


Whoops, just noticed the codebase= attribute. Try putting the jar file in that folder.

[FakeRabbit]

Wow that seems to be the solution :) But now I'm experiencing another problem:

java.lang.NoClassDefFoundError: adminpanel/AdminPanelApp
	at adminpanel.Admin.init(Admin.java:26)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

My first guess was to put the AdminPanel.jar file (jar with my application from dist folder) in the same folder as the rest of them but it didn't work out. I also tried to put it in classes/adminpanel folder - same result :(

Oh and I am running it just by clicking on the html file.

[Norm]

adminpanel/AdminPanelApp

Is the above class file in the jar file with the correct path?
Is the jar file in the ARCHIVE= attribute?
The JVM won't look in a jar file for a class just because it's there. You must tell it to look at the jar file..

[FakeRabbit]

okay, I've put the jar file in the adminpanel folder and changed AdminPanel.jar into adminpanel/AdminPanel.jar and the problem seems to be solved. Now I get another one:

javax.persistence.PersistenceException: No Persistence provider for EntityManager named fakerabbitPU: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory: 
java.security.AccessControlException
java.security.AccessControlException: access denied (java.util.PropertyPermission toplink.logging.level read)

Yeah, I know - it's just one after another error :) Thanks for your patience :)

[Norm]

access denied (java.util.PropertyPermission toplink.logging.level read)

Applets are NOT allowed to read files on the local PC. You need to giver permission to the applet to allow it to access local PC files.
There have been posts on this forum with all the details. Use Search for Permission or .java.policy for them.

[FakeRabbit]

Thanks a lot! Now it works fine :)