HTTP 404 the requested resource can not be found [duplicate]

This question already has answers here: Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available" (19 answers) Closed 6 years ago.

I am getting HTTP 404 the requested resource can not be found.

I was executing my servlets comfortably a while ago. I compiled my last servle开发者_如何学Got and it compiled fine. Then I added it to my web.xml file and restarted my webserver and ever since I am getting the same error on all applets even the ones which were running fine earlier. I checked the web.xml file for errors but it seems OK.

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I am getting HTTP 404 the requested resource can not be found.

This can have several causes:

• URL is plain wrong. It has to match <url-pattern> of the servlet in web.xml.
• Mapping in web.xml is plain wrong. Read the server startup log for details.
• Servlet construction/initialization failed. Read the server startup log for details.
• Webapp startup failed completely. Read the server startup log for details.