running a class with main from a servlet in j2EE

Question

How to (or can i) run a class with main() from a servlet??

i want to take input from a html page and insert data into a database using hibernate.

-i have an annotated class.

-a class having main(), running which inserts the data into the database.

-and a servlet with post method code:

String input_from_html=request.getParameter("input_from_html");

I need to put the data 'input_from_html' to the class with main() and run the class,which should happen once the submit button in the html page is pressed.

Answer 1

This is not a good idea, because you want your database insert to be within a transaction so it can either commit or rollback as appropriate. Running the insert as an executable triggered by a request to a servlet means there won't be any transaction that's initiated by the incoming request.

Answer 2

Invoke the main like any normal static method.

For Ex,

class MainClass {
  public static void main(String args[]){

  }
}

You can call this main method inside servlet like :

class AServlet extends HttpServlet {
  public void service(...){
      MainClass.main(...);
  }
}