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Applet error NoClassDefFoundError when run through HTML file

Brennen smith
Ranch Hand

Joined: Dec 29, 2010
Posts: 33
I have created compiled and run many Java programs, but this is my first applet. I am doing a project for school basically to connect a DB to a java applet. I have the class set up and when I run through Netbeans "Run File" It works perfectly. I am able to connect to the DB... no issues at all. So now I just need it to work through an HTML window... This is where my issue starts. I have tried to read as much about applets as I can but still do not understand a lot of what I read.

When I run the applet through an HTML window I get the error: java.lang.NoClassDefFoundError: org/jdesktop/layout/GroupLayout$Group

The .html file I am using is the one in the project/build folder under the default netbeans project structure.



I have confirmed that the following path is correct. (<APPLET codebase="classes" code="DBapp/appletgui.class")

Also, I am using swing-layout-1.0.4.jar I think this might be part of my problem.
Tim Moores
Rancher

Joined: Sep 21, 2011
Posts: 2408
Yes, you need an archive attribute that points to the jar file. If you keep the jar file in the same directory as the HTML file, then it would just read archive="swing-layout-1.0.4.jar".
Steve Luke
Bartender

Joined: Jan 28, 2003
Posts: 4181
    
  21

Yes, your problem is that you are using resources found in JARs which are not available to the applet runtime. You have to move these JARs into someplace reachable by clients (i.e. someplace your web server can share them from), preferably relative to the applet's codebase attribute. Then you add an archive attribute to the applet tag with the path to the JAR. So for example, your codebase is classes, so you might have:
classes/
classes/DBApp/ (your appletgui.class here)
classes/lib/ (your .JAR files here)


Then your applet tag might look like:


Steve
Brennen smith
Ranch Hand

Joined: Dec 29, 2010
Posts: 33
Thank you I knew it had something to do with that .jar. Everything is working perfectly now.
 
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