Fix Java 8 Javadoc

Author: garydgregory

pom.xml

@@ -306,6 +306,24 @@
         <!-- Javadoc 8 expects a package-list file in the Javadoc root but current Java versions generate an element-list file. -->
         <commons.javadoc.failOnWarnings>true</commons.javadoc.failOnWarnings>
       </properties>
+        <build>
+          <plugins>
+            <plugin>
+              <groupId>org.apache.maven.plugins</groupId>
+              <artifactId>maven-javadoc-plugin</artifactId>
+              <configuration>
+                <linksource>true</linksource>
+                <links>
+                  <link>${commons.javadoc.javaee.link}</link>
+                  <link>https://commons.apache.org/proper/commons-lang/apidocs</link>
+                  <!-- http://www.jdom.org/docs/apidocs/ is not a secure link -->
+                  <link>https://javadoc.io/doc/org.jdom/jdom/1.1</link>
+                </links>
+                <excludePackageNames>org.apache.commons.jxpath.ri.parser</excludePackageNames>
+              </configuration>
+            </plugin>
+          </plugins>
+        </build>
     </profile>
   </profiles>
   <developers>