File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes java.lang.NoClassDefFoundError Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of REST with Spring (video course) this week in the Spring forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "java.lang.NoClassDefFoundError" Watch "java.lang.NoClassDefFoundError" New topic


Payam Mamaani

Joined: Jul 04, 2001
Posts: 7
When I wrote a java application it using JFrame works fine. but I changed it to an applet (JApplet), I got error message in run time:
java.lang.NoClassDefFoundError: Project1$5
at Project1.showFieldCombo(
at Project1.ComboBoxShow(
at Project1.init(
Process Exit...
I'm using a signed applet as a jar file and the jar file is in my classpath.

Thanks a lot,
Suma MM
Ranch Hand

Joined: Apr 30, 2001
Posts: 31

I am not able to figure out if u did define a .html file to make the applet run or if u had just changed the JFrame to JApplet and tried rerunning the same code using "javac" for compilation followed by "java" to run the applet.

U might want to "copy-paste" ur code in ur reply so that things get clearer.

[This message has been edited by Suma MM (edited July 07, 2001).]
Sean Casey
Ranch Hand

Joined: Dec 16, 2000
Posts: 625
Are you testing the JApplet in your browser or with the appletviewer. I don't believe most browsers support Swing. I think you need to install a plugin.
Payam Mamaani

Joined: Jul 04, 2001
Posts: 7
Thanks a lot for your replies,
I found the problem , I had used a jar file and some of my class file (with nnnn$#) weren't in the jar file.
Thanks again,
I agree. Here's the link:
subject: java.lang.NoClassDefFoundError
It's not a secret anymore!