What's the difference from Spring boot 2.0.0 to 2.2.1 about javax.servlet.* library dependency - spring-boot

Question

I am doing Spring boot mvc project with JSP.
When I use version 2.0.0.RELEASE, everything is ok!
Here is part of my pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
...
And this is my startup class:
package com.test;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
#SpringBootApplication
public class TestApplication extends SpringBootServletInitializer {
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(TestApplication .class);
}
public static void main(String[] args) {
SpringApplication.run(TestApplication .class, args);
}
}
But when I change my spring-boot-starter-parent to 2.2.1.RELEASE
Eclipse report error in my startup class:
Multiple markers at this line
- The type javax.servlet.ServletContext cannot be resolved. It is indirectly referenced from
required .class files
- The type javax.servlet.ServletException cannot be resolved. It is indirectly referenced from
required .class files
I know that I can add some other dependencies to solve this, but I don't want to.
Could anybody guide me to the difference in spring boot versions? Thanks in advance!