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Unable to load class null

 
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Howdy folks,
I have entered the Hello World custom tag from Professional Jsp 2nd Edition starting on page 294. The jsp page executes the tag in Tomcat as it is supposed to, but I don't understand why I cannot get the jsp file to compile.
I get the message "HelloWorld.jsp [8:2] Unable to load class null". Has anyone seen this before?
Thanks,
Howard
 
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source code please
 
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