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. Dear Friends, I get the following exception...

View Tutorial          By: NT.Jay at 2011-10-06 05:33:09

2. Nice Intro to start J2Me
View Tutorial          By: Mak at 2009-07-04 10:36:00

3. really very excellent example....ThanQ...:)
View Tutorial          By: Tulasi at 2010-08-17 00:41:21

4. Please some one send me the 6th program developed
View Tutorial          By: mounika at 2008-04-25 02:49:56

5. i want full material of java with ds
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View Tutorial          By: madhulatha at 2009-02-01 16:49:22

6. Hi you can find inheritance example in Java in the
View Tutorial          By: Mashoud at 2008-04-26 20:12:37

7. how to connect jdbc in java on mysql
View Tutorial          By: saravana kumar at 2012-01-30 06:06:57

8. Could any one please send the working source code
View Tutorial          By: Raviteja at 2014-06-24 05:27:43

9. Nice article
View Tutorial          By: Chakravarthy at 2009-06-09 23:29:09

10. Great article! Simple and precise. Thanks!
View Tutorial          By: dz at 2014-10-06 04:36:56