spring boot and actuators – live blogging from spring days

Spring Boot and Actuators
Speaker: John Humphreys
See list of all blog posts from conference

Spring Boot

  • makes it easy to create standalone apps
  • opinionated view of which third party libraries to use
  • 9 lines of code to get coding
  • can embed Tomcat or Undertwo in your app
  • No Spring config needed as defaults
  • Makes uberwar
  • Add 1 lines to run war as init.d service
  • many integrations
  • only need two maven dterations

9 lines of code
the 9 lines of code to get started are an annotation and a one ine main method
SpringApplcation run (MyApp.class,args);
The other lines are imports/class name/braces/etc

@SpringBootApplicatoin replaces need for many other common spring annotations

  • @Configuraton – define beans in Java
  • EnableAutoConfiguration – configure beans
  • @ComponentScan – search for and wire up classes

Add an endpoint to actually do something. map URLs and functionality

Spring Boot Inititialzr – enter dependencies you want online and it gives you a working spring boot web service without needing dependencies


  • spring-boot-starter-pom parent pom so can get started.
  • spring-boot-starter-web dependency for deploying to Tomcat
  • spring-boot-starter-actuator – for monitoring the application
  • spring-boot-starter-hateos- for adding monitoring as REST endpoint and in browser
  • spring-boot-maven-plugin – creates uber war. has option to embed init.d support by setting &ltexecutable>true</executable>
  • spring-boot-admin-server-ui – minotrs and lets interact with app – just flag with @EnableAdminServer, can expose with JMX

application.properties – lets override defaults


  • for monitoring
  • provides a lot of URLs by default and can add more of your own
  • Each cluster has own actuator
  • Masks passwords by default
  • Very customizable
  • Can show live thread dumps
  • Text based – use UI dependency to see graphically

Overall – cool to see it built live – pieces are easy to understand. I didn’tknow what n actuator was so learned that too. I’ve only een the very basics of Spring Boot so this was a great first talk for me to hear. An embedded Tomcat is interesting. Easy because one thing. Tomcat has frequent patches though so definitely would want continuous deployment!

Leave a Reply

Your email address will not be published.