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單項(xiàng)選擇題

Given this fragment from a Java EE deployment descriptor:
341.<error-page>
342.<exception-type>java.lang.Throwable</exception-type> 
343.<location>/mainError.jsp</location>
344.</error-page>
345.<error-page>
346.<exception-type>java.lang.ClassCastException</exception-type> 
347.<location>/castError.jsp</location>
348.</error-page>
If the web application associated with the fragment above throws a ClassCastException.Which statement is true?()

A.The deployment descriptor is invalid.
B.The container invokes mainError.jsp.
C.The container invokes castError.jsp.
D.Neither mainError.jsp nor castError.jsp is invoked.

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