Java Console Application Run Via Cmd - Java | Dream.In.Code

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5 Replies - 58 Views - Last Post: Today, 02:43 PM Rate Topic:

#1 riperator ?

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• Posts: 9
• Joined: 19-May 13

Posted Today, 12:07 PM

I compiled succesfuly all classes that I have in this project, but than when I tried to run it in cmd with java Main, cmd says:

Exception in thread "main" java.lang.NoClassDefFounderror: Main

Is This A Good Question/Topic? 0

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Replies To: java console application run via cmd

#2 jon.kiparsky ?

Reputation: 5440

• Posts: 8,760
• Joined: 19-March 11

Re: java console application run via cmd

Posted Today, 12:15 PM

Sounds like java isn't finding a class called Main
There's a couple of reasons why that could happen. One is that that class just doesn't exist. Another is that it exists, but Java can't find it. If you list the directory you're in, and you see Main.class, please post the code for that class. If you don't see that class, that's probably why you're getting this error.

This post has been edited by jon.kiparsky: Today, 12:15 PM

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#3 riperator ?

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• Joined: 19-May 13

Re: java console application run via cmd

Posted Today, 12:40 PM

I type in cmd dir, and it shows me all the classes with .class that I compiled.. Here is the additional report to Exception in thread "main".. i41.tinypic.com/acxwjk.jpg Like what do you think cause problem, imports ? I'm using Netbeans IDE, and pretty much everything shows up and run correctly, but from cmd.. i don't get

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#4 jon.kiparsky ?

Reputation: 5440

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Re: java console application run via cmd

Posted Today, 01:03 PM

That'll explain it. Netbeans is probably creating packages for your program - this is good practice, but when you're running from the command line, you have to call the class from the right place. A package is a directory - so if you see

package net.kiparsky.foo

java will look for these class files under the directory ./net/kiparsky/foo

So if I try to run a file with that package declaration from the directory it's in:

/Users/jon/java/junk:514 $ ls Junk.class  Junk.class [jon: Sat May 25 15:58]  /Users/jon/java/junk:515 $ java Junk Exception in thread "main" java.lang.NoClassDefFoundError: Junk (wrong name: net/kiparsky/foo/Junk) 	at java.lang.ClassLoader.defineClass1(Native Method) 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615) 	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) 	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) 	at java.net.URLClassLoader.access$000(URLClassLoader.java:58) 	at java.net.URLClassLoader$1.run(URLClassLoader.java:197) 	at java.security.AccessController.doPrivileged(Native Method) 	at java.net.URLClassLoader.findClass(URLClassLoader.java:190) 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306) 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247) [jon: Sat May 25 15:58]  /Users/jon/java/junk:516 $  

But if I put it in the right directories:

 /Users/jon/java/junk:521 $ mv Junk.class net/kiparsky/foo/ [jon: Sat May 25 16:00]  /Users/jon/java/junk:522 $ java net/kiparsky/foo/Junk Hello, World! [jon: Sat May 25 16:00]  

So what you want to do is look at the package declaration at the top of your source file, and cd up until you're one level outside of that hierarchy. If it's a one-level package:

 package foo;

Then you'll just cd up one level, then run foo/Main

That should get you there.

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#5 riperator ?

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• Joined: 19-May 13

Re: java console application run via cmd

Posted Today, 01:18 PM

So I decided to create a new project, with a one level package just like I have in my primary project, and I'm actually inside that one level dir, I type dir to see files, and it shows me HelloWorld.java and HelloWorld.class, than I type in java HelloWorld.. and it's showing me the same exception..??

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#6 jon.kiparsky ?

Reputation: 5440

• Posts: 8,760
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Re: java console application run via cmd

Posted Today, 02:43 PM

Quote

I'm actually inside that one level dir, I type dir to see files, and it shows me HelloWorld.java and HelloWorld.class, than I type in java HelloWorld.. and it's showing me the same exception..??

So if you have this code:

package hello;  public class HelloWorld{   // nothing surprising here } 

and you're actually in the directory hello, and you see the HelloWorld.class file, then you need to change directory and go one level up. Then you can run the class with

>> java hello/HelloWorld

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