Class not found exception in Java Reflection

Question

Hi I am using the following code from this site: http://java.sun.com/developer/technicalArticles/ALT/Reflection/

But when I am running it it showing exception java.lang.ClassNotFoundException: A May be I am going somewhere wrong Please help. Here is the code:

package com.Test;  
  class A {}

public class instance1 {
       public static void main(String args[])
       {
          try {
             Class cls = Class.forName("A");
            System.out.println("gfsdga");
             boolean b1 
               = cls.isInstance(new Integer(37));
             System.out.println(b1);
             boolean b2 = cls.isInstance(new A());
             System.out.println(b2);
          }
          catch (Throwable e) {
             System.err.println(e);
          }
       }
    }

The previous answers are correct, nothing to add except that your package names should be all lowercase. It's the Java convention, and sticking to conventions makes the coding world a little brighter. — pcalcao
– pcalcao, Commented Jan 6, 2012 at 12:25

Jon Skeet · Accepted Answer · 2012-01-06 12:22:07Z

18

The class is actually called com.Test.A because you've declared it within the com.Test package - Class.forName() takes the package-qualified class name. (Note that com.Test is a pretty odd package name, too.)

answered Jan 6, 2012 at 12:22

Jon Skeet

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1 Comment

Maverick Over a year ago

Oh dat was too fast....Thanks Jon.Yes Jon I know package name is pretty odd but I am learning Java reflection now thats why I have just taken any package name

Vlad · Accepted Answer · 2012-01-06 12:22:38Z

6

You need Class.forName("com.Test.A") instead.

answered Jan 6, 2012 at 12:22

Vlad

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