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. well...raghu download the sun api...whose link is
View Tutorial          By: rima at 2008-12-27 22:22:03

2. Good day. I managed to get the application to work
View Tutorial          By: thabiso at 2011-06-03 09:21:32

3. You don't have to call the constructors. When you
View Tutorial          By: Watson at 2011-05-04 10:44:23

4. Great details you provided here, very straight for
View Tutorial          By: Jackie Wong at 2010-02-05 10:52:25

5. i get this error too.
: Parent: child proce

View Tutorial          By: Anon at 2009-02-25 08:30:58

6. Error loading SolarisSerial: java.lang.Unsatisfied
View Tutorial          By: koteshwar at 2011-02-05 05:33:19

7. plz wait for your solution
View Tutorial          By: Desai Rajesh at 2010-03-11 22:00:32

8. thanku very much. it is a good examples for abstr
View Tutorial          By: rajesh at 2010-12-17 10:57:42

9. hi, ashray p shetty
can you please tell me

View Tutorial          By: amrish at 2010-12-12 07:30:49

10. Thanks.... Nice Example
View Tutorial          By: Nagarjuna at 2012-05-29 12:00:50