Choosing embedded servlet containers

If we decide that we want to use Jetty as our servlet container, we will need to add a Jetty starter to our build file.

How to do it...

1. As Tomcat already comes as a transitive dependency of Spring Boot, we will need to exclude it from our build dependency tree by adding the following to build.gradle:

configurations { 
  compile.exclude module: "spring-boot-starter-tomcat" 
}

2. We will also need to add a compile dependency to our build dependencies on Jetty:

compile("org.springframework.boot:spring-boot-starter-jetty")

3. To fix the compiler errors, we will need to remove the bean declaration of Tomcat's RemoteIpFilter from our WebConfiguration class, as the Tomcat dependency has been removed.
4. Start the application by running ./gradlew clean bootRun
5. If we now look at the console logs, we will see that our application is running in Jetty:

2017-12-16 --- o.eclipse.jetty.server.AbstractConnector 
 : Started ServerConnector...2017-12-16 ---.o.s.b.web.embedded.jetty.JettyWebServer...