upgrading docker container to use Java 21

Author: ORybak5

docker/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3.8'
 services:
   integration-adaptor-111:
     build:

docker/service/Dockerfile

@@ -1,16 +1,16 @@
-FROM gradle:8.8-jdk17 AS build
+FROM gradle:8.11.0-jdk21-jammy AS build
 COPY --chown=gradle:gradle service /home/gradle/service
 
 WORKDIR /home/gradle/service
 
 RUN ./gradlew --build-cache bootJar
 
-FROM eclipse-temurin:17-jre-jammy
+FROM eclipse-temurin:21-jre-jammy
 
 EXPOSE 8081
 
 RUN mkdir /app
 
 COPY --from=build /home/gradle/service/build/libs/integration-adaptor-111.jar /app/integration-adaptor-111.jar
 
-ENTRYPOINT ["java", "-cp", "/app/integration-adaptor-111.jar", "-Dloader.main=uk.nhs.adaptors.oneoneone.OneOneOneApplication", "org.springframework.boot.loader.PropertiesLauncher"]
+ENTRYPOINT ["java", "-cp", "/app/integration-adaptor-111.jar", "-Dloader.main=uk.nhs.adaptors.oneoneone.OneOneOneApplication", "org.springframework.boot.loader.launch.PropertiesLauncher"]

nhs-england-developer-information.md

@@ -4,7 +4,7 @@
 > The audience of this documentation is designed for NHS England developers.
 
 ## Pre requisites for running the Adaptor:
-1. JDK 17
+1. JDK 21
 2. Docker
 
 ## How to run service: