Version 1.15.6

pom.xml

@@ -256,15 +256,19 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.0.1</version>
+                <version>3.1.1</version>
                 <configuration>
-                    <show>public</show>
+                    <source>8</source>
+                    <show>private</show>
                     <failOnError>false</failOnError>
                     <additionalJOption>-Xdoclint:none</additionalJOption>
+                    <!-- To compile with Java 11, this tag may be required -->
+                    <!-- <javadocExecutable>${java.home}/bin/javadoc</javadocExecutable> -->
                 </configuration>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
+                        <phase>install</phase>
                         <goals>
                             <goal>jar</goal>
                         </goals>