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    <p>This is a variation of the "common beginners error" with running Java programs from the command line.</p> <blockquote> <p>java test or java -classpath directory test or java -cp . test it throws "Exception in thread main java.lang.NoClassDefFoundError: test (wrong name: deem/test).</p> </blockquote> <p>The JVM is in effect telling you that found "test.class" on the search path, but when it read class file, it concluded that the file <em>should</em> have been at "./deem/test.class" or "directory/deem/test.class" ... depending on which "-cp" / "-classpath" argument you <em>actually</em> used</p> <blockquote> <p>If I use java deem.test it says: Error, could not find or load main class deem.main</p> </blockquote> <p>This is now telling you that it cannot find "deem/main.class".</p> <p>Note that you have <em>now</em> told it to look for a class called "deem.main" instead of "test" or "deem.test". (Or perhaps you just transcribed something incorrectly there.)</p> <p>The rules are really rather simple:</p> <ol> <li>You must give the <strong>fully qualified</strong> class name to <code>java</code> as the first argument after the options. (<em>Not</em> the simple class name. <em>Not</em> the ".class" file name. <em>Not</em> the name of the entry point method.)</li> <li>You must specify the classpath such that the <code>java</code> command can <ul> <li>map the class name into a relative pathname for the class file (e.g. <code>foo.bar.baz.MyClass</code> maps to <code>foo/bar/baz/MyClass.class</code>) ... </li> <li>and then resolve that relative path against one of the classpath entries; e.g. if <code>.</code> is the classpath, then <code>./foo/bar/baz/MyClass.class</code>.</li> </ul></li> <li>The class must have the required <code>public static void main(String[])</code> entry point method.</li> </ol> <p>So <strong>IF</strong> ...</p> <ol> <li>the fully qualified class name of your class is <code>deem.test</code>; i.e. the <code>test</code> class is in the package <code>deem</code>, <strong>AND</strong></li> <li>the corresponding class file is in <code>./deem/test.class</code>, <strong>AND</strong></li> <li>it has the required entry point method, <strong>AND</strong></li> <li>the test application doesn't depend on other classes of yours or 3rd party libraries ...</li> </ol> <p><strong>THEN</strong> <code>java -cp . deem.test</code> should work.</p>
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    1. CO+1, well said..
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      1. USRussell Gutierrez
 

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