Comment on Tutorial - java.lang.NoClassDefFoundError and java.lang.NoSuchMethodError in UNIX By Yolander



Comment Added by : Lahrach Abdelhakim

Comment Added at : 2015-02-18 14:38:03

Comment on Tutorial : java.lang.NoClassDefFoundError and java.lang.NoSuchMethodError in UNIX By Yolander
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp

If you receive this error, java cannot find your bytecode file, HelloWorldApp.class.

One of the places java tries to find your bytecode file is your current directory. So, for example, if your bytecode file is in /home/jdoe/java, you should change your current directory to that. To change your directory, type the following command at the prompt and press Return:

cd /home/jdoe/java
If you enter pwd at the prompt, you should see /home/jdoe/java. If you enter ls at the prompt, you should see your .java and .class files. Now enter java HelloWorldApp again.

If you still have problems, you might have to change your CLASSPATH environment variable. To see if this is necessary, try clobbering the classpath with the following command.

unset CLASSPATH
Now enter java HelloWorldApp again. If the program works now, you'll have to change your CLASSPATH variable in the same manner as the PATH variable above.

Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/class

A common mistake made by beginner programmers is to try and run the java launcher on the .class file that was created by the compiler. For example, you'll get this error if you try to run your program with java HelloWorldApp.class instead of java HelloWorldApp. Remember, the argument is the name of the class that you want to use, not the filename.

Exception in thread "main" java.lang.NoSuchMethodError: main

The Java VM requires that the class you execute with it have a main method at which to begin execution of your application. A Closer Look at the "Hello World!" Application, , consult this lecture "Creating a Hello World application" in this page. http://learnjavaeasy.com/course/learn-java-online-with-java-8-by-examples/


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Archived Comments

1. gr8 work :)
View Tutorial          By: ahmad at 2011-03-23 01:05:57

2. Hi All,

This code is working fine i

View Tutorial          By: A.Balaji at 2010-09-27 04:40:38

3. thank you.
View Tutorial          By: lluulnw at 2014-11-22 12:39:35

4. Thanks man, really very helpful..,.
Thanks

View Tutorial          By: Manish at 2012-10-18 06:19:03

5. The following line in the code
((NewThread)

View Tutorial          By: Carlos at 2009-11-18 14:34:51

6. Hi, I need the library of Communication API, to ru
View Tutorial          By: arun at 2008-10-23 05:10:06

7. Program is good and easy to understand
View Tutorial          By: sravs at 2011-05-16 00:45:05

8. How to download more than one files. If I use for
View Tutorial          By: Riyas at 2012-01-08 07:55:03

9. Hello, I have stupid questions, but I need to ask
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10. how to trim in jsp page and to send the trimed con
View Tutorial          By: monishaa at 2015-07-16 10:06:11