How to open Javadoc JAR file in web browser Rename the file waimak-parent_2.12-2.9.7-javadoc.jar to waimak-parent_2.12-2.9.7-javadoc.zip Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder waimak-parent_2.12-2.9.7-javadoc Double click index.html will open the index page on your default web browser. How to generate Javadoc from a source JAR? Running the command javadoc: javadoc --ignore-source-errors -encoding UTF-8 -sourcepath "waimak-parent_2.12-2.9.7-sources.jar" -d "waimak-parent_2.12-2.9.7-javadoc" -subpackages