java , eclipse jar problem
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by Raxvan
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Published on 2010-05-25T20:42:25Z
Indexed on
2010/05/25
21:11 UTC
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Hello , i'm kind of new to java. I use eclipse and i imported some jar files with some classes by going to properties -> Add External Jars; The problem is that when i try to use a class from the jar i get the following exception:
Exception in thread "main" java.lang.NoClassDefFoundError: nextapp/echo2/app/event/ActionListener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at Program.main(Program.java:12)
Caused by: java.lang.ClassNotFoundException: nextapp.echo2.app.event.ActionListener
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 13 more
The class is supposed to create a window, i guess that the jar has to import somehow other stuff or something like that, How can i fix this?
PS. Sorry for the bad code , i don't know tags here.
thansk, Raxvan
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