Add java 21 (#1)

Author: falconcr

content/language/java/containerize.md

@@ -63,7 +63,7 @@ WARNING: The following Docker files already exist in this directory:
 ? Do you want to overwrite them? Yes
 ? What application platform does your project use? Java
 ? What's the relative directory (with a leading .) for your app? ./src
-? What version of Java do you want to use? 17
+? What version of Java do you want to use? 21
 ? What port does your server listen on? 8080
 ```
 
@@ -94,7 +94,7 @@ Create a file named `Dockerfile` with the following contents.
 ################################################################################
 
 # Create a stage for resolving and downloading dependencies.
-FROM eclipse-temurin:17-jdk-jammy as deps
+FROM eclipse-temurin:21-jre-jammy as deps
 
 WORKDIR /build
 
@@ -151,7 +151,7 @@ RUN java -Djarmode=layertools -jar target/app.jar extract --destination target/e
 # most recent version of that tag when you build your Dockerfile.
 # If reproducability is important, consider using a specific digest SHA, like
 # eclipse-temurin@sha256:99cede493dfd88720b610eb8077c8688d3cca50003d76d1d539b0efc8cca72b4.
-FROM eclipse-temurin:17-jre-jammy AS final
+FROM eclipse-temurin:21-jre-jammy AS final
 
 # Create a non-privileged user that the app will run under.
 # See https://docs.docker.com/go/dockerfile-user-best-practices/

content/language/java/develop.md

@@ -116,7 +116,7 @@ Replace the contents of your Dockerfile with the following.
 ```dockerfile {hl_lines="22-29"}
 # syntax=docker/dockerfile:1
 
-FROM eclipse-temurin:17-jdk-jammy as deps
+FROM eclipse-temurin:21-jdk-jammy as deps
 WORKDIR /build
 COPY --chmod=0755 mvnw mvnw
 COPY .mvn/ .mvn/
@@ -144,7 +144,7 @@ RUN cp -r /build/target/extracted/application/. ./
 ENV JAVA_TOOL_OPTIONS -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8000
 CMD [ "java", "-Dspring.profiles.active=postgres", "org.springframework.boot.loader.launch.JarLauncher" ]
 
-FROM eclipse-temurin:17-jre-jammy AS final
+FROM eclipse-temurin:21-jre-jammy AS final
 ARG UID=10001
 RUN adduser \
     --disabled-password \

content/language/java/run-tests.md

@@ -20,7 +20,7 @@ Replace the contents of your Dockerfile with the following.
 ```dockerfile {hl_lines="3-19"}
 # syntax=docker/dockerfile:1
 
-FROM eclipse-temurin:17-jdk-jammy as base
+FROM eclipse-temurin:21-jre-jammy as base
 WORKDIR /build
 COPY --chmod=0755 mvnw mvnw
 COPY .mvn/ .mvn/
@@ -59,7 +59,7 @@ RUN cp -r /build/target/extracted/application/. ./
 ENV JAVA_TOOL_OPTIONS="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8000"
 CMD [ "java", "-Dspring.profiles.active=postgres", "org.springframework.boot.loader.launch.JarLauncher" ]
 
-FROM eclipse-temurin:17-jre-jammy AS final
+FROM eclipse-temurin:21-jre-jammy AS final
 ARG UID=10001
 RUN adduser \
     --disabled-password \