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"WAR file must contain a deployement descriptor"

 
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On p.643 of Head First book,


Which statements about WAR files are true?
...
B. A valid WAR file must contain a deployment descriptor.



I think a deployment descriptor is optional with Servlet 3.0.
According to Oracle's documentation :http://docs.oracle.com/cd/E14571_01/web.1111/e13712/web_xml.htm#WBAPP502,


With Java EE annotations, the standard web.xml deployment descriptor is optional.


 
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You are correct. If you look at the copyright on Head First Java, you'll see that it way predated the web.xml becoming optional.
 
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