How to open Javadoc JAR file in web browser
- Rename the file paypay-spring-boot-starter-common-1.2.0-20200903-javadoc.jar to paypay-spring-boot-starter-common-1.2.0-20200903-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder paypay-spring-boot-starter-common-1.2.0-20200903-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 "paypay-spring-boot-starter-common-1.2.0-20200903-sources.jar" -d "paypay-spring-boot-starter-common-1.2.0-20200903-javadoc" -subpackages 
