Added hot-reload for backend

backend/Dockerfile.dev

@@ -1,5 +1,7 @@
 FROM gradle:8.12-jdk21 AS build
 WORKDIR /app
+ENV HOME /root
 COPY . .
 RUN chmod +x ./gradlew
-CMD ["./gradlew", "bootRun"]
+RUN chmod +x start.sh && ./gradlew getDependencies
+CMD ["sh", "start.sh"]

backend/build.gradle.kts

@@ -19,6 +19,7 @@ repositories {
 }
 
 dependencies {
+	developmentOnly("org.springframework.boot:spring-boot-devtools")
 	implementation("org.springframework.boot:spring-boot-starter")
 	implementation("org.jetbrains.kotlin:kotlin-reflect")
 	implementation("org.springframework.boot:spring-boot-starter-web")
@@ -29,4 +30,20 @@ kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll("-Xjsr305=strict")
 	}
-}
+}
+
+tasks.register<Copy>("getDependencies") {
+    from(sourceSets.main.get().runtimeClasspath)
+    into("runtime/")
+
+    doFirst {
+        val runtimeDir = File("runtime")
+        runtimeDir.deleteRecursively()
+        runtimeDir.mkdir()
+    }
+
+    doLast {
+        File("runtime").deleteRecursively()
+    }
+}
+

backend/src/main/kotlin/com/mac/mploy/controller/HelloController.kt

@@ -27,4 +27,4 @@ class HelloController(
             throw e
         }
     }
-}
+}

backend/src/main/resources/application.yml

@@ -17,4 +17,13 @@ logging:
     io.lettuce.core: DEBUG
 
 server:
-  port: 8080
+  port: 8080
+
+devtools:
+  restart:
+    enabled: true
+
+# Enable LiveReload if needed
+spring.devtools.livereload.enabled: true
+
+spring.devtools.reload.trigger-file: .reloadtrigger

backend/start.sh

@@ -0,0 +1,6 @@
+# Start spring boot devtools process in the background.
+# This is necessary for hot reload.
+(./gradlew -t :bootJar) &
+# Next, start the app. 
+# The "PskipDownload" option ensures dependencies are not downloaded again.
+./gradlew bootRun -PskipDownload=true --parallel --build-cache --continuous

docker-compose.dev.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   redis:
     image: redis:alpine
@@ -12,9 +10,18 @@ services:
     build:
       context: ./backend
       dockerfile: Dockerfile.dev
+    develop:
+      watch:
+      - action: rebuild
+        path: ./backend/src  # Watch the entire src directory
+    volumes:
+      - ./backend:/app
     ports:
+      - "35729:35729"
       - "8080:8080"
     environment:
+      - SPRING_PROFILES_ACTIVE=dev
+      - SPRING_DEVTOOLS_RESTART_ENABLED=true
       - REDIS_HOST=redis
       - REDIS_PORT=6379
     networks:
@@ -38,4 +45,4 @@ services:
 
 networks:
   mploy-network:
-    driver: bridge
+    driver: bridge