Hi, I wanted to help you because the same issue I was facing from last week and solved now.
As per my experience and understanding, the java application can be opened at port 8080 or 9080. but the hosting by default listen the post 80 (apache server for php).
If your application is running fine on domainname:9080 or domainname:8080 then you need a redirection. if not then use application name as ROOT and the default opening page index.jsp, I mean ROOT/index.jsp.
Now try domainname:8080 or domainname:9080, it your application is working fine then:
Add .htaccess file at the root of your file directory for this domain (this is the same location for your default page index.html is coming while accessing your domain).
put this code in your .htaccess file by making required changes (my website name is fluma.in and running on 9080 post):