BUILD target Java 17 in picocli-shell-jline3 build when possible

Author: remkop

dependencies.gradle

@@ -3,9 +3,9 @@
 
 // Spring Boot 3.0 requires Java 17 as a minimum version
 boolean useSpring3 = JavaVersion.current().majorVersion.compareTo("17") >= 0;
-logger.quiet("JavaVersion=${JavaVersion.current()}")
-logger.quiet("JavaVersion.majorVersion=${JavaVersion.current().majorVersion}")
-logger.quiet("useSpring3=${useSpring3}")
+logger.quiet("dependencies.gradle: JavaVersion=${JavaVersion.current()}")
+logger.quiet("dependencies.gradle: JavaVersion.majorVersion=${JavaVersion.current().majorVersion}")
+logger.quiet("dependencies.gradle: useSpring3=${useSpring3}")
 
 ext {
     // PICOCLI VERSION

picocli-shell-jline3/build.gradle

@@ -7,8 +7,18 @@ description 'Picocli Shell JLine3 - easily build interactive shell applications
 version "$projectVersion"
 ext.moduleName = 'info.picocli.shell.jline3'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+// Spring 3 requires Java 17
+boolean useJava17 = JavaVersion.current().majorVersion.compareTo("17") >= 0;
+if (useJava17) {
+    logger.quiet("picocli-shell-jline3/build.gradle: JavaVersion=${JavaVersion.current()}")
+    logger.quiet("picocli-shell-jline3/build.gradle: sourceCompatibility = 17")
+    logger.quiet("picocli-shell-jline3/build.gradle: targetCompatibility = 17")
+    sourceCompatibility = 17
+    targetCompatibility = 17
+} else { // from Java 9 and up
+    sourceCompatibility = 1.8
+    targetCompatibility = 1.8
+}
 
 dependencies {
     api                rootProject