Java version check: only check >=11 (#12)

Author: stefan-ka

.github/workflows/build_standard.yml

@@ -44,11 +44,10 @@ jobs:
         path: ./out
         if-no-files-found: error
 
-  validate_java_8:
+  validate_java_11:
     runs-on: ubuntu-latest
     needs:
       - build
-
     steps:
       - name: Download build
         uses: actions/download-artifact@v2
@@ -57,18 +56,17 @@ jobs:
           path: ./out
       - name: Grant execute permission for cm
         run: chmod +x ./out/bin/cm
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 8
+          java-version: 11
       - name: Execute to check if Java version is compatible
         run: ./out/bin/cm
 
-  validate_java_11:
+  validate_java_17:
     runs-on: ubuntu-latest
     needs:
       - build
-
     steps:
       - name: Download build
         uses: actions/download-artifact@v2
@@ -77,18 +75,17 @@ jobs:
           path: ./out
       - name: Grant execute permission for cm
         run: chmod +x ./out/bin/cm
-      - name: Set up JDK 11
+      - name: Set up JDK 17
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 17
       - name: Execute to check if Java version is compatible
         run: ./out/bin/cm
 
-  validate_java_17:
+  validate_java_21:
     runs-on: ubuntu-latest
     needs:
       - build
-
     steps:
       - name: Download build
         uses: actions/download-artifact@v2
@@ -97,9 +94,9 @@ jobs:
           path: ./out
       - name: Grant execute permission for cm
         run: chmod +x ./out/bin/cm
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v1
         with:
-          java-version: 17
+          java-version: 21
       - name: Execute to check if Java version is compatible
-        run: ./out/bin/cm || if [ $? != 1 ]; then exit -1; fi
+        run: ./out/bin/cm

src/main/java/org/contextmapper/cli/ContextMapperCLI.java

@@ -25,7 +25,7 @@
 
 public class ContextMapperCLI {
 
-    private static final List<String> REQUIRED_JAVA_VERSIONS = Collections.unmodifiableList(Arrays.asList("11", "17"));
+    private static final int REQUIRED_JAVA_VERSION = 11;
     private static final String VALIDATE_COMMAND = "validate";
     private static final String GENERATE_COMMAND = "generate";
 
@@ -38,12 +38,12 @@ public ContextMapperCLI() {
     }
 
     public static void main(String[] args) {
-        String javaVersion = System.getProperty("java.version");
+        int javaVersion = Runtime.version().feature();
 
-        if (REQUIRED_JAVA_VERSIONS.stream().anyMatch(javaVersion::startsWith)) {
+        if (Runtime.version().feature() >= REQUIRED_JAVA_VERSION) {
             new ContextMapperCLI().run(args);
         } else {
-            System.out.printf("Invalid Java version '%s', please set JAVA_HOME to major version '%s'%n", javaVersion, String.join("' or '", REQUIRED_JAVA_VERSIONS));
+            System.out.printf("Invalid Java version '%s' (>=%s is required).", javaVersion, REQUIRED_JAVA_VERSION);
             System.exit(1);
         }
     }