Java Exception in thread main - ClassNotFoundException

Question

I'm working with another system library in Eclipse. One time, the library got somehow removed and eclipse showed a red "!" next to the projects folder icon. I re-imported the library, but there is still the red "!". Once I try to compile and run a program, it gives me a "ClassNotFoundException".

Exception in thread "main" java.lang.NoClassDefFoundError: MyClass
Caused by: java.lang.ClassNotFoundException: MyClass
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

My java file:

public class MyClass {

    public static void main(String[] args) {
        System.out.println("Test");
    }

}

I don't see any mistakes in my source code. What is going on?

there is a view called problems view and you can see the errors in there, mostly it is a classpath related error — Arun P Johny
– Arun P Johny, Commented Mar 23, 2013 at 15:17
Where your .class files are being saved? Have you set the classpath ? — Vishal K
– Vishal K, Commented Mar 23, 2013 at 15:21
In eclipse rightclick on project-->properties-->java build path-->remove the old library and add new one — Pragnani Kinnera
– Pragnani Kinnera, Commented Mar 23, 2013 at 15:22

Pragnani Kinnera · Accepted Answer · 2013-05-17 04:50:04Z

4

Converting Comments as Answer

In eclipse rightclick on project-->properties-->java build path-->remove the old library and add new one

answered May 17, 2013 at 4:50

Pragnani Kinnera

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1 Comment

felix fritz Over a year ago

Thanks for making it official ;)

ROMANIA_engineer · Accepted Answer · 2016-02-29 16:30:17Z

0

Go the the Package Explorer, scroll up and right click on the name of your project (that must appear with a red cross) and then select refresh.

I was sorted out using that method. I hope it will help you.

edited Feb 29, 2016 at 16:30

ROMANIA_engineer

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answered Nov 22, 2013 at 12:36

Souleymane

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1 Comment

felix fritz Over a year ago

This was answered 6 months ago already, but thanks. (how did you even find this question?)

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