chore(jdk): upgrade to JDK21 (#326)

.github/workflows/pr-ci.yaml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: 'maven'
     - run: mvn -B -U clean verify

.github/workflows/push-ci.yaml

@@ -40,7 +40,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: 'maven'
     - name: Build application

README.md

@@ -10,7 +10,7 @@ This demonstrates how a simple JSON data source can be used in Grafana to read t
 
 ### Dependencies
 
-For native image support, GraalVM 23.0 (Java 17 version) is needed with the environment variable `GRAALVM_HOME` set to its path. It can be downloaded from:
+For native image support, GraalVM for Java 21 is needed with the environment variable `GRAALVM_HOME` set to its path. It can be downloaded from:
 ```
 https://github.com/graalvm/graalvm-ce-builds/releases
 ```
@@ -29,7 +29,7 @@ https://podman.io/getting-started/installation.html
 
 ### Build and run locally
 
-This project uses [Quarkus](https://quarkus.io), which can produce a JAR to run in a JVM (JDK 17+), or an executable native image.
+This project uses [Quarkus](https://quarkus.io), which can produce a JAR to run in a JVM (JDK 21+), or an executable native image.
 
 To build a JAR:
 ```bash
@@ -44,7 +44,7 @@ Native image builds may use more than 4G of RAM to finish.
 To build a native image within a container, for a consistent environment:
 ```bash
 ./mvnw -Pnative -Dquarkus.native.container-build=true -Dquarkus.native.container-runtime=podman \
--Dquarkus.native.builder-image=quay.io/quarkus/ubi-quarkus-mandrel-builder-image:23.0-java17 \
+-Dquarkus.native.builder-image=quay.io/quarkus/ubi-quarkus-mandrel-builder-image:jdk-21 \
 clean verify
 ```
 

pom.xml

@@ -10,7 +10,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <java.version>17</java.version>
+    <java.version>21</java.version>
     <maven.compiler.release>${java.version}</maven.compiler.release>
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
@@ -270,7 +270,7 @@
         <configuration>
           <java>
             <googleJavaFormat>
-              <version>1.15.0</version>
+              <version>1.23.0</version>
               <style>AOSP</style>
               <reflowLongStrings>true</reflowLongStrings>
             </googleJavaFormat>

src/main/docker/Dockerfile.jvm

@@ -21,7 +21,7 @@
 # docker run -i --rm -p 8080:8080 -p 5005:5005 -e JAVA_DEBUG="true" quarkus/cryostat-reports-jvm
 #
 ###
-FROM registry.access.redhat.com/ubi8/openjdk-17-runtime:1.20-3.1724181070
+FROM registry.access.redhat.com/ubi8/openjdk-21-runtime:1.20-2.1727147592
 
 ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en'