classnotfound

**mirror666** · 11-11-2008, 11:31 AM

hi guys. im new to java and im trying to run in a webpage a particular application i found.
i can compile the class successfully ( java 6 update 10 ) with "javac sender.java" but when i try to run it both in the command line and through a webpage i get an error like this :

error when i run in it in the command line :

Java Code:

Exception in thread "main" java.lang.NoClassDefFoundError: sender (wrong name: net/sender)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: sender.  Program will exit.

error message from java console ( when i run it in a webpage ) :

Java Code:

java.lang.NoClassDefFoundError: sender (wrong name: net/sender)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NoClassDefFoundError: sender (wrong name: net/sender)

this is the html ( how i'm running it through a webpage :

Java Code:

<html>
 <applet applet code="sender.class" width=300 height=120>
 </applet>
 </html>

now i noticed this error is probably because of the "package net;" first line. but if comment it out, i will get other errors when running the app.
any help would be greatly appreciated.

**Nicholas Jordan** · 11-11-2008, 02:54 PM

packaging

I take out the packaging statements, then build in NetBeans with them in place after I get the program running.

Sounds like a package && classpath issue, I never did get that working correctly and just work manually to avoid all the convoluted crannies.