Spring Boot DevTools — Spring Technical Interview Questions & Answers

Live reload and fast developer feedback loop.

Spring Boot DevTools

  • DevTools makes local development faster with automatic restart/reload support.
  • Use only in development, not production.
  • Helps when you change code often and want quick feedback.
  • Add the devtools dependency; Boot detects classpath changes.
  • Shipping DevTools to production builds.
  • DevTools = faster feedback loop for developers.

Technical Interview Tip: Say clearly: development only.

Code Examples for Spring Boot DevTools

Spring Boot DevTools — working example

# application.properties
spring.devtools.restart.enabled=true
spring.devtools.livereload.enabled=true
spring.main.banner-mode=console

# banner.txt on the classpath prints at startup
#  ____             ____        __
# |  _ \ _ __ ___  | __ )  ___ / _|
# | |_) | '__/ _ \ |  _ \ / _ \ |_

Spring Boot DevTools — devTools restarts on classpath changes; banner-mode/banner.txt customize the boot splash.

How to Explain Spring Boot DevTools to an Interviewer

What is Boot DevTools (sb)?

Used for a short Boot DevTools sb example a small REST app Not just the heading

Give one small example of Boot DevTools (sb).

the smallest Boot DevTools sb example you can type Live reload and fast developer feedback loop

What mistake do beginners make with Boot DevTools (sb)?

only saying “Boot DevTools sb” with no example Show the fix

Where do you use Boot DevTools (sb)?

a small REST app a short Boot DevTools sb example