One minor addition: explicit javadoc java version

(otherwise, if java home is not set, then we get an exception)
This way, we use the standard system version if not defined by java home

Author: jurajsomorovsky

pom.xml

@@ -156,15 +156,16 @@
                 <version>3.2.0</version>
                 <configuration>
                     <source>8</source>
+                    <javadocExecutable>${java.home}/bin/javadoc</javadocExecutable>
                 </configuration>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
                         <goals>
                             <goal>jar</goal>
                         </goals>
-                    </execution>
-                </executions>
+		    </execution>
+	        </executions>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>