how would server know what should be the first servlet to display when application launches

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Java

hi all,

I am new to servlets. I want to know how the server decides what servlet should be called very first when app is being launched. Please explain me referring web.xml.

in details : suppose in web.xml , there are 5 servlets and one welcome file . In this 5 servlets there is one action servlet also. so how can I know what servlet would get called first.

Hope you got my question.