Solve the problem of spring boot + jar packaging deployment tomcat 404 error

1. Spring boot does not support jsp jar package, jsp can only be war package.
method:

<packaging>war</packaging>

<build>
 	<plugins>
 		<plugin>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-maven-plugin</artifactId>
 		</plugin>
 	</plugins>
</build>

2. The tomcat version cannot be too new, as it may be unstable. If you use tomcat10, the result will be 404. If you use tomcat9, it will be normal.

The word spring never appears when deployed to tomcat10

Change to tomcat9 and you can see the changes immediately

insert image description here

Successful deployment

insert image description here

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