Add Javadoc and JXR plugins

pom.xml

@@ -145,6 +145,16 @@
           <artifactId>maven-jar-plugin</artifactId>
           <version>3.1.0</version>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-javadoc-plugin</artifactId>
+          <version>3.1.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jxr-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-project-info-reports-plugin</artifactId>
@@ -269,6 +279,19 @@
     </plugins>
   </build>
 
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-javadoc-plugin</artifactId>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jxr-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </reporting>
+
   <profiles>
     <profile>
       <id>nonfree</id>