Class not found error in Netbeans

Question

I am using Netbeans from many days. But suddenly it started giving me following errors for simple hello programs.

 java.lang.NoClassDefFoundError: newr
 Caused by: java.lang.ClassNotFoundException: newr
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main" Java Result: 1 
BUILD SUCCESSFUL (total time: 3 seconds)

here it is

My prog is simple hello program

public class newr {
public static void main(String argv[]){
    System.out.println("hello");
}
}

It happens very very oftentimes with me. I had tried to uninstall and again install it but this doesn't resolve my problem. I also tried to delete .netbeans folder that contain net bean's cache. But i have to delete this .netbeans folder every times it gives me such errors. Is there any way to permanently fix the error? I am tired of deleting the cache and uninstalling netbeans please help me....

Might want to post some code of your application, the problem probably isn't your NetBeans installation. — Jean-Philippe Roy, Commented Feb 10, 2012 at 14:04
I am not sure but maybe it is related to this problem: http://stackoverflow.com/q/5965798/620338 and has something to do with the lowercase/uppercase class name (class names should begin with an uppercase letter in java). — Matt Handy, Commented Feb 10, 2012 at 14:18
see this link may be helpful to you.. stackoverflow.com/questions/3537769/… — Abhishek Aggarwal, Commented Feb 25, 2012 at 3:45

user453441 · Accepted Answer · 2012-11-27 19:12:45Z

10

Deleting NetBeans's cache worked for me (version 7.2).

Find the cache folder (In help->about), close NetBeans, navigate to the folder, and delete the index folder. Reopen NetBeans, clean and rebuild, and it should find all the classes this time.

answered Nov 27, 2012 at 19:12

user453441

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This process worked for me, but is there a way within Netbeans to force this cache clear? I feel like that's a failing on the environment's part if it has to be done manually like this.
– Draque Thompson
Commented Feb 24, 2017 at 15:35

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brahmdevpandey · Accepted Answer · 2021-01-12 11:21:03Z

0

Deleting the cache of NetBeans solves the problem. To automate this task, you can manually write a script which would first delete the cache folder and then start NetBeans. You can also make this script executable and use it as the shortcut for starting NetBeans. You can Google the process of making your script executable, depending on your Operating System.

answered Jan 12, 2021 at 11:21

brahmdevpandey

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