build: Update to Java 21

.github/workflows/commit.yml

@@ -12,7 +12,7 @@ jobs:
         - uses: actions/setup-java@v2
           with:
             distribution: 'temurin'
-            java-version: 17
+            java-version-file: .java-version
 
         - name: Run tests
           uses: extenda/actions/maven@v0
@@ -43,7 +43,7 @@ jobs:
       - uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version-file: .java-version
 
       - name: Build
         uses: extenda/actions/maven@v0

.java-version

@@ -1 +1 @@
-17
+21

Dockerfile

@@ -1,6 +1,8 @@
-FROM eclipse-temurin:17-centos7
+FROM eclipse-temurin:21
 
-RUN yum -y install graphviz
+RUN apt update \
+    && apt -y install graphviz \
+    && apt clean
 
 COPY target/lib /app/lib
 COPY target/*.jar /app
@@ -9,4 +11,4 @@ EXPOSE 3000
 
 WORKDIR /docs
 
-ENTRYPOINT ["/opt/java/openjdk/bin/java", "-jar", "/app/structurizr-to-png.jar"]
+CMD ["java", "-jar", "/app/structurizr-to-png.jar"]

README.md

@@ -175,7 +175,7 @@ The following view properties are supported with the `structurizr` renderer.
 
 # Development
 
-  * The project is built with Java 17 and Maven.
+  * The project is built with Java 21 and Maven.
     * `mvn verify` to build and run all tests
     * `java -jar target/structurizr-to-png.jar` runs the client on your local machine
   * Running locally requires Graphviz

pom.xml

@@ -31,7 +31,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <java.version>17</java.version>
+    <java.version>21</java.version>
     <java.source.version>${java.version}</java.source.version>
     <java.target.version>${java.version}</java.target.version>
     <maven.compiler.source>${java.version}</maven.compiler.source>