Apply comments posted on the pull request.

Author: desruisseaux

src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java

@@ -166,7 +166,7 @@ public abstract class AbstractJarMojo implements org.apache.maven.api.plugin.Moj
     protected AbstractJarMojo() {}
 
     /**
-     * {@return the specific output directory to serve as the root for the archive}.
+     * {@return the specific output directory to serve as the root for the archive}
      */
     protected abstract Path getClassesDirectory();
 
@@ -180,20 +180,20 @@ protected final Project getProject() {
     }
 
     /**
-     * {@return the <abbr>MOJO</abbr> logger}.
+     * {@return the <abbr>MOJO</abbr> logger}
      */
     protected final Log getLog() {
         return log;
     }
 
     /**
-     * {@return the classifier of the JAR file to produce}.
+     * {@return the classifier of the JAR file to produce}
      * This is usually null or empty for the main artifact, or {@code "tests"} for the JAR file of test code.
      */
     protected abstract String getClassifier();
 
     /**
-     * {@return the type of the JAR file to produce}.
+     * {@return the type of the JAR file to produce}
      * This is usually {@code "jar"} for the main artifact, or {@code "test-jar"} for the JAR file of test code.
      */
     protected abstract String getType();
@@ -288,7 +288,7 @@ public Path createArchive() throws MojoException {
     @Override
     public void execute() throws MojoException {
         if (skipIfEmpty && isEmpty(getClassesDirectory())) {
-            getLog().info("Skipping packaging of the " + getType() + '.');
+            getLog().info(String.format("Skipping packaging of the %s.", getType()));
         } else {
             Path jarFile = createArchive();
             ProducedArtifact artifact;