Receiving "wrong name" NoClassDefFoundError when executing a Java program from the command-line -

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i have problem while trying executing java application. whenever try execute program through command 

java progaudioj

i error:

exception in thread "main" java.lang.noclassdeffounderror: progaudioj (wrong name: es_2011/progaudioj)         @ java.lang.classloader.defineclass1(nativemethod)         @ java.lang.classloader.defineclasscond(classloader.java:632)         @ java.lang.classloader.defineclass(classloader.java:616)         @ java.security.secureclassloader.defineclass(secureclassloader.java:141)         @ java.net.urlclassloader.defineclass(urlclassloader.java:283)         @ java.net.urlclassloader.access$000(urlclassloader.java:58)         @ java.net.urlclassloader$1.run(urlclassloader.java:197)         @ java.security.accesscontroller.doprivileged(nativemethod)         @ java.net.urlclassloader.findclass(urlclassloader.java:190)         @ java.lang.classloader.loadclass(classloader.java:307)         @ sun.misc.launcher$appclassloader.loadclass(launcher.java:301)         @ java.lang.classloader.loadclass(classloader.java:248) not find main class: progaudioj.  program exit.

if remove code:

package es_2011;

everything works perfectly. how solve problem?

because found these answers unclear, here need do. first, if package code (ie classes have package keyword @ top) compiled classes have in directory same name package declaration in code. after have compiled classes, need move directory when exectute java command, , include name of package. example, if code exists in /myfolder/mypackage/ , , class starts package mypackage (note directory , package same name), following (linux / osx):

cd /myfolder/mypackage  javac myclass.java   cd ..  java mypackage.myclass

edit - late edit clarify see people confused on. in example above, package 1 deep, meaning mypackage. if code has larger package, like

package com.somedomain.someproject;

you need execute java command directory contains root directory package. example if compiled code in mycode/com/somedomain/someproject/mymainclass.class, execute java command mycode folder, (again, take special note directory structure same package declaration):

cd /mycode java com.somedomain.someproject.mymainclass

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