CODEWITHSUNDEEP
javaeclipseerror-handling
user3220849
user3220849

Reputation:

Java Throws exception in thread main java.lang.NoClassDefFoundError

I am a beginner in Java but not in OOP I have some experience in C and C++ and PHP5 For short I have "hello world" program for test

     package com.tutorial.helloworld;
     public class helloWorld {

     public static void main(String[] args) {
              System.out.print("hello world!!!\n");
      }

}

When I compile in console with javac compile with no error but when I run Java helloWorld says

 Exception in thread "main" java.lang.NoClassDefFoundError: helloWorld (wrong name:  
 com/tutorial/helloworld/helloWorld)  and much more code

In eclipse run ok. If I delete package statement and compile manually will run ok. but if I keep package statement throws that error. should I put the class file in a subdirectory com/tutorial/helloworld and is that ok how should I run from terminal and from what directory?

I am on mac os x and I am use to type code in edit and compile and run from console than run in a ice. I cannot make eclipse to work for c++ (c++ ide)and because of that I try to stick on the console with all languages I know or I learn.

Upvotes: 0

Views: 444

Answers (1)

Marko Topolnik
Marko Topolnik

Reputation: 200168

In Java the class name consists of package name + the class's "first name". Therefore write

java com.tutorial.helloworld.helloWorld

You must also know where your .class files are. You must be in the directory containing the com directory for this to work, where the .class file finds itself inside com/tutorial/helloworld directory.

Upvotes: 2

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