You can detect Payara Server Default Page using this tool.
The remote web server uses its default welcome page. Therefore, it's probable that this server is not used at all or is serving content that is meant to be hidden.
The remote web server is not configured or is improperly configured. If attackers detect the default page, they will try to detect vulnerabilities related to this version of Payara Server.
Remove the default index page or configure the default web page initially.