Exception in thread "main" java.lang.ClassNotFoundException:

Question

I recently installed intellij IDEA 14.0 and to make sure everything was working I created a simple Hello World program. I do not understand why the output is not correct and why I am getting this error. If someone could please help that would be great.

This is the program:

public class Hello {
  public static void main(String[] args) {
    System.out.println("Hello World!");
  }
}

This is the error:

Exception in thread "main" java.lang.ClassNotFoundException: Hello
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:116)

Isn't that a duplicate of http://stackoverflow.com/questions/16857849/intellij-suddenly-throwing-classnotfoundexception ? — Gabriel, Jan 10 '15 at 00:20

score 4 · Answer 1 · answered Jan 10 '15 at 00:19

4

The reason you're getting this error is because you didn't save the class into a file called Hello.java (case-sensitive!)

answered Jan 10 '15 at 00:19

Nir Alfasi

53,191
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score 3 · Answer 2 · edited Jan 01 '19 at 11:05

3

This is just problem of intellij IDE.

Solution Steps:

CtrlShiftAlts -> Preject Setting -> modules tab -> expand <project_name> and go to <project_name>_main
refer Image:
In Sources tab -> ** click on x symbol**

click YES
Right click on -> sources
Apply and OK

Finally build your project.

Enjoy.

edited Jan 01 '19 at 11:05

slava

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answered Oct 01 '18 at 10:44

ankit

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score 0 · Answer 3 · answered Mar 26 '19 at 16:11

0

It usually happens with IntelliJ.

I solved it deleting all modules and only leaving which have more hierarchy

The other modules(like main or test) are already part of product

answered Mar 26 '19 at 16:11

dmarquina

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Exception in thread "main" java.lang.ClassNotFoundException:

3 Answers3

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