Tomcat Error: Wrapper cannot find servlet class ... Problem solving _java

When Tomcat publishes the project, it enters the correct address in the browser and encounters the following problems:

HTTP Status 500-

Javax.servlet.ServletException:Wrapper cannot find servlet class XXX or a class it depends on

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Java.lang.ClassNotFoundException:xxx

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Problem Analysis:

The <servle-mapping> and <servlet-class> content in the Web.xml file is incorrectly configured.

1. The name of the two is consistent 2. Whether the configured class has a 3.servlet class that is not compiled so that the servlet class cannot be found;

methods: View the class file for the Servlet class in the Engineering class directory to see if the compiler exists.

A class file that does not have a compilation is usually present.

Solution:

If build automaticlly is not turned on, Eclipse opens project->bulid automatically, and then deploys the publication, and if there are no other errors, it will work correctly after compilation.

or manually click Project--build Project to build the project each time you publish your deployment!

Note: Build automaticlly is used for building projects automatically

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