support release compiler options for javac and scalac

Author: gzm55

src/main/java/scala_maven/ScalaMojoSupport.java

@@ -99,6 +99,15 @@ public abstract class ScalaMojoSupport extends AbstractMojo {
   @Parameter(property = "addScalacArgs")
   private String addScalacArgs;
 
+  /** The -target argument for the Scala compiler. */
+  @Parameter(property = "scala.compiler.target")
+  protected String scalacTarget;
+
+  /** The -release argument for the Scala compiler, supported since scala 2.13. */
+  @Parameter(property = "scala.compiler.release")
+  protected String scalacRelease;
+
+
   /** override the className (FQN) of the scala tool */
   @Parameter(required = false, property = "maven.scala.className")
   protected String scalaClassName;
@@ -154,6 +163,10 @@ public abstract class ScalaMojoSupport extends AbstractMojo {
   @Parameter(property = "maven.compiler.target")
   protected String target;
 
+  /** The --release argument for the Java compiler (when using incremental compiler), supported since Java9. */
+  @Parameter(property = "maven.compiler.release")
+  protected String release;
+
   /** The -encoding argument for the Java compiler. (when using incremental compiler). */
   @Parameter(property = "project.build.sourceEncoding", defaultValue = "UTF-8")
   protected String encoding;
@@ -577,6 +590,15 @@ protected List<String> getScalaOptions() throws Exception {
       Collections.addAll(options, StringUtils.split(addScalacArgs, "|"));
     }
     options.addAll(getCompilerPluginOptions());
+
+    if (scalacTarget != null && !scalacTarget.isEmpty()) {
+      options.add("-target:" + scalacTarget);
+    }
+    if (scalacRelease != null && !scalacRelease.isEmpty()) {
+      options.add("-release");
+      options.add(scalacRelease);
+    }
+
     return options;
   }
 
@@ -591,13 +613,18 @@ protected List<String> getJavacOptions() {
     if (javacGenerateDebugSymbols) {
       options.add("-g");
     }
-    if (target != null && !target.isEmpty()) {
-      options.add("-target");
-      options.add(target);
-    }
-    if (source != null && !source.isEmpty()) {
-      options.add("-source");
-      options.add(source);
+    if (release != null && !release.isEmpty()) {
+      options.add("--release");
+      options.add(release);
+    } else {
+      if (target != null && !target.isEmpty()) {
+        options.add("-target");
+        options.add(target);
+      }
+      if (source != null && !source.isEmpty()) {
+        options.add("-source");
+        options.add(source);
+      }
     }
     if (encoding != null) {
       options.add("-encoding");