Use Jetty instead of Tomcat in Java Spring Boot

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

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web:1.4.2.RELEASE")
    compile("org.springframework.boot:spring-boot-starter-jetty:1.4.2.RELEASE")
    // ...
}

Reference
http://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-servlet-containers.html#howto-use-jetty-instead-of-tomcat