MAX session limit for single module application

Hi,

I new to Vaadin framework. I began with a single module application project.
Question:
How can I set a concurrency-control with max session property.
This project doesnt have any web.xml.

I really appreciateit if anyone can help.

I'm not sure what you mean by concurrency-control and max session property. Do you by any chance mean the session-timeout as in http://stackoverflow.com/questions/15382895/session-timeout-in-web-xml?

Anyway, you can always create the web.xml file in the src/main/webapp/WEB-INF directory and it should be picked automatically by web container. For example:

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">
  <session-config>
    <session-timeout>-1</session-timeout>
  </session-config>
</web-app>