Generate javadoc and fix warning

antlr4-maven-plugin/pom.xml

@@ -330,6 +330,20 @@
                 </executions>
             </plugin>
 
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>2.9</version>
+                <executions>
+                    <execution>
+                        <id>attach-javadocs</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
         </plugins>
 
     </build>

antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4ErrorLog.java

@@ -55,7 +55,7 @@ public class Antlr4ErrorLog implements ANTLRToolListener {
 
     /**
      * Sends an informational message to the Maven log sink.
-     * @param s The message to send to Maven
+     * @param message The message to send to Maven
      */
     @Override
     public void info(String message) {