[FIXED] Spring boot docker autoreload using devtools

Issue

I am working with Spring boot and I am trying to setup an docker environment that updates the application, when I make changes on my own computer.

I have found the Spring boot dev tools is what I need to use, and I have setup this already. But the application never updates the code even when I hit save and can see in the console that it updates.

This is my Dockerfile:

#### Stage 1: Build the application
FROM openjdk:8-jdk-alpine as build

# Set the current working directory inside the image
WORKDIR /app

# Copy maven executable to the image
COPY mvnw .
COPY .mvn .mvn

# Copy the pom.xml file
COPY pom.xml .

# Build all the dependencies in preparation to go offline. 
# This is a separate step so the dependencies will be cached unless 
# the pom.xml file has changed.
RUN ./mvnw dependency:go-offline -B

# Copy the project source
COPY src src

# Package the application
RUN ./mvnw package -DskipTests
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)

#### Stage 2: A minimal docker image with command to run the app 
FROM openjdk:8-jre-alpine

ARG DEPENDENCY=/app/target/dependency

# Copy project dependencies from the build stage
COPY --from=build ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY --from=build ${DEPENDENCY}/META-INF /app/META-INF
COPY --from=build ${DEPENDENCY}/BOOT-INF/classes /app

ENTRYPOINT ["java","-cp","app:app/lib/*","com.example.polls.PollsApplication"]

This is what I have In my POM.xml and seems to be working

And as you can see, when I hit save, this is the output in the console.

I have checked inside the container, that the files are updated, and they are. So my question is - Why is my application not updating with the new code, even tho it says it has changed and the files IS changed? Is it something with my docker?

Solution

I found this article to be helpful when setting up a Docker environment.

Dockerfile:

FROM eclipse-temurin:11
RUN apt-get update && apt-get -y upgrade
RUN apt-get install -y inotify-tools dos2unix
ENV HOME=/app
RUN mkdir -p $HOME
WORKDIR $HOME

run.sh

#!/bin/bash
dos2unix mvnw
./mvnw spring-boot:run -Dspring-boot.run.jvmArguments="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005" &
while true; do
  inotifywait -e modify,create,delete,move -r ./src/ && ./mvnw compile
done

docker-compose.yml

version: '3.3'
services:
  api:
    build:
      context: ./
      dockerfile: Dockerfile
    volumes:
      - ./:/app
      - ./.m2:/root/.m2
    working_dir: /app
    command: sh run.sh
    ports:
      - 8080:8080
      - 35729:35729
      - 5005:5005

Answered By - Helth
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)