Tomcat 4.2 is not loading a class in jar file

Hi All,
I have a java class B in a jar file which is in tomcat's lib directory. I am trying to instantiate class B from class A which is in the same jar file. But I am unable to create an instance of class B and the control in the program simply advance to the next line and there is no error printed in tomcat log files.
Can anyone please tell me what am I missing here ... why class A is getting loaded correctly whereas class B is not loaded by tomcat ?
Thanks & Regards,
Kumar.

Can you sure that there is only a A class in the classpath of Tomcat, I advise you to add
some statements into the A class so that you can be sure which classloader is used
to load the A class.

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