CODEWITHSUNDEEP
javanetbeansnetbeans6.8
Malachi
Malachi

Reputation: 33720

NoClassDefFoundError when running Netbeans 6.8 application

My application has recently started throwing NoClassDefFoundError errors when I am running my application from within NetBeans. It never used to do this.

And when I run this outside of NetBeans using the command line argument that it provides once built, these errors are not produced

Is this a bug with Netbeans?

I have reinstalled NetBeans as I recently had another that was resolved by reinstalling, however the problem still persists.

Symbol error in java application using netbeans 6.8 when adding a shared project to library

Within Netbeans

alt text http://inverse.seednet.eu/snaps/ojtjal.png

Outside NetBeans alt text http://inverse.seednet.eu/snaps/gdwb5y.png

Upvotes: 1

Views: 4203

Answers (5)

Zon
Zon

Reputation: 19918

We had jar-library correctly added to Project Libraries and working fine. Then, suddenly, it stopped working with this error.

To solve:

 1. Delete build and dist folders in the Project.
 2. Remove and add the library back to Project - Libraries. 
 3. Rebuild Project.

Upvotes: 0

Midge
Midge

Reputation: 51

I had the same problem, NoClassDefFoundError out of the blue. What seems to have caused the problem in my case was initializing a Handler in a static Context. Although i have done this succesfully before. this specific instance caused the following exception:

10:45:08.196    19376   com.certhon.activities  ERROR   QualiflexApp    Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Solving this also solved the NoClassDefFoundError, maybe the the handler causes app initialization to malfunction or something?

Im not very sure what went wrong or if this will help anyone, but, can't hurt to share right?

Upvotes: 0

user641687
user641687

Reputation:

So I had this problem as well. I read Temp_user's solution above, and did something similar, though my main class was present in Project Properties/Run. My program consisted of four separate classes. After going through each, adding a syntax error, clean and build, correcting the syntax error and cleaning and building again, the program works. I don't really understand how this fixed anything. Any insight would be appreciated.

Upvotes: 1

John
John

Reputation: 1791

My solution consisted of setting the Main Class in Project Properties/Run. In that window click Browse to see all classes. In my case the main class was gone, to get it to reappear I added a syntax error to the main class, rebuilt, corrected the mistake, rebuilt, and then I was able to set the main class properly.

Upvotes: 1

Fazal
Fazal

Reputation: 3051

The issue is the run time classpath of the run configuration when you are running it from netbeans. Make sure your run config has the jar containing these classes

Upvotes: 1

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