nel web.xml hai definito il nome ?
nel formcodice:<web-app> <servlet> <servlet-name>servlet</servlet-name> <servlet-class>nomePackage.Servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>servlet</servlet-name> <url-pattern>/servlet</url-pattern> </servlet-mapping> </web-app>
<form name="pippo" action="servlet">

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