bumped Dockerfiles to Java 21

java-native/simplecode/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
+#Thu Jan 02 20:40:38 UTC 2025
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

java/.settings/org.eclipse.jdt.core.prefs

@@ -1,10 +1,21 @@
 eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
+org.eclipse.jdt.core.compiler.annotation.nonnull=org.springframework.lang.NonNull
+org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.springframework.lang.NonNullApi
+org.eclipse.jdt.core.compiler.annotation.nullable=org.springframework.lang.Nullable
+org.eclipse.jdt.core.compiler.annotation.nullanalysis=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=generate
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
 org.eclipse.jdt.core.compiler.compliance=17
 org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=warning
+org.eclipse.jdt.core.compiler.problem.nullReference=warning
+org.eclipse.jdt.core.compiler.problem.nullSpecViolation=warning
+org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=ignore
+org.eclipse.jdt.core.compiler.problem.potentialNullReference=warning
 org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.problem.syntacticNullAnalysisForFields=enabled
 org.eclipse.jdt.core.compiler.processAnnotations=disabled
 org.eclipse.jdt.core.compiler.release=enabled
 org.eclipse.jdt.core.compiler.source=17

java/Dockerfile-multistage-builder

@@ -1,10 +1,10 @@
-FROM maven:3-eclipse-temurin-17 AS build
+FROM maven:3-eclipse-temurin-21 AS build
 RUN mkdir -p /opt/app/src
 COPY src /opt/app/src
 COPY pom.xml /opt/app
 RUN mvn -f /opt/app/pom.xml clean package
 
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 RUN mkdir -p /opt/app
 COPY --from=build /opt/app/target/simplecode-0.0.1-SNAPSHOT.jar /opt/app/simplecode-0.0.1-SNAPSHOT.jar
 ENTRYPOINT ["java","-jar","/opt/app/simplecode-0.0.1-SNAPSHOT.jar"]

java/Dockerfile-multistage-cache

@@ -1,10 +1,10 @@
-FROM maven:3-eclipse-temurin-17 AS build
+FROM maven:3-eclipse-temurin-21 AS build
 RUN mkdir -p /opt/app/src
 COPY src /opt/app/src
 COPY pom.xml /opt/app
 RUN --mount=type=cache,target=/root/.m2 mvn -f /opt/app/pom.xml clean package
 
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 RUN mkdir -p /opt/app
 COPY --from=build /opt/app/target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java","-jar","/opt/app.jar"]

java/Dockerfile-simple-ibm-semeru

@@ -1,3 +1,3 @@
-FROM ibm-semeru-runtimes:open-17-jre
+FROM ibm-semeru-runtimes:open-21-jre
 COPY target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java", "-jar", "/opt/app.jar"]

java/Dockerfile-simple-temurin

@@ -1,3 +1,3 @@
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 COPY target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java", "-jar", "/opt/app.jar"]

java/Dockerfile-simple-temurin-JVMflags

@@ -1,3 +1,3 @@
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 COPY target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java","-XX:+UseParallelGC","-XX:MaxRAMPercentage=75","-jar", "/opt/app.jar"]

java/Dockerfile-simple-temurinjre

@@ -1,3 +1,3 @@
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 COPY target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java", "-jar", "/opt/app.jar"]

java/Dockerfile-simple-ubuntu

@@ -1,5 +1,5 @@
-FROM ubuntu:22.04
-RUN apt update && apt install openjdk-17-jre-headless -y
+FROM ubuntu:latest
+RUN apt update && apt install openjdk-21-jre-headless -y
 COPY target/simplecode-0.0.1-SNAPSHOT.jar /opt/app.jar
 CMD ["java","-jar","/opt/app.jar"]
 

java/gradlex/.settings/org.eclipse.buildship.core.prefs

@@ -1,11 +1,11 @@
-arguments=--init-script /workspace/.vscode-remote/data/User/globalStorage/redhat.java/1.18.0/config_linux/org.eclipse.osgi/51/0/.cp/gradle/init/init.gradle --init-script /workspace/.vscode-remote/data/User/globalStorage/redhat.java/1.18.0/config_linux/org.eclipse.osgi/51/0/.cp/gradle/protobuf/init.gradle
+arguments=--init-script /home/vscode/.vscode-server/data/User/globalStorage/redhat.java/1.38.0/config_linux/org.eclipse.osgi/58/0/.cp/gradle/init/init.gradle --init-script /home/vscode/.vscode-server/data/User/globalStorage/redhat.java/1.38.0/config_linux/org.eclipse.osgi/58/0/.cp/gradle/protobuf/init.gradle
 auto.sync=true
 build.scans.enabled=false
-connection.gradle.distribution=GRADLE_DISTRIBUTION(LOCAL_INSTALLATION(/home/gitpod/.sdkman/candidates/gradle/current))
+connection.gradle.distribution=GRADLE_DISTRIBUTION(WRAPPER)
 connection.project.dir=
 eclipse.preferences.version=1
-gradle.user.home=/workspace/.gradle
-java.home=/home/gitpod/.sdkman/candidates/java/17.0.7.fx-zulu
+gradle.user.home=
+java.home=/usr/local/sdkman/candidates/java/current
 jvm.arguments=
 offline.mode=false
 override.workspace.settings=true

java/src/main/java/de/maeddes/simplecode/SimplecodeApplication.java

@@ -27,15 +27,15 @@ private String getHostname(){
 	}
 
 	@GetMapping("/")
-	String hello(){
+	String helloABCAB(){
 
-		logger.info("Call to hello method on instance: " + getHostname());
+		logger.info("Call to helloABC method on instance: " + getHostname());
 		return getHostname()+" Hello, Container people ! ";
 
 	}
 
 	@GetMapping("/fail")
-	String fail() {
+	String failABC() {
 
 		logger.info("Call to failing method on instance: "+getHostname());
 		System.exit(1);