Spring Boot Cookbook

Choosing embedded servlet containers

Despite Tomcat being the default embedded container in Spring Boot, we are not limited to only one. Spring Boot provides you with ready-to-use starters for Jetty and Undertow as well, so we have a choice of 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") ...