[play-framework] How To Handle Dynamic Row(form) Insertion In Scala-template Play2.4

I have a scala template that take *single userName and age* as input and 
submit that we can simply handle binding and passing form of class
Class FormExample {
   String userName;
   int age;}
Now suppose user want one more button like *add_more_user* and when he 
clicked on *add_more_user,* he will get new row where he can insert other 
userName and Age in same. And once he click on submit all username and age 
must be saved in databases.
My question is how to handle this dynamic functionality in scala template 
and inside controller so that once user click *add_more_user* button one 
new row appear and there he can add new userName and age and controller can 
received list of value once after clicking on submit button. I tried using 
list but not able to received value.
*I am useing play2.4 and my controller code in java 1.8*
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