Eclipse starts Tomcat and suddenly fails to start error, which causes it not to start

Tried the

1. Reinstall Tomcat

2. Re-configure the Tomcat server in eclipse

It's not going to work out.

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Finally read a question and Answer page in a foreign language, and one of the answers lets you double-check the Web. xml file

There's no problem with the naked eye, but it's good to have a servlet in the last configuration.

Note: When configuring Web. XML, the order in which each label appears is arranged according to the constraint rules