How to open Javadoc JAR file in web browser
- Rename the file mockito-rest-spring-undertow-javadoc.jar to mockito-rest-spring-undertow-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder mockito-rest-spring-undertow-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 "mockito-rest-spring-undertow-sources.jar" -d "mockito-rest-spring-undertow-javadoc" -subpackages 
