title: How to achieve multi tenancy?
body: <p>I am new to cloud-computing. And while learning basic concepts got stuck with with- How design a system in which a single instance of a software (SaaS) can be used by multiple user at same time?</p>
  
  <p>I understand what does it mean by multi-tenant, but could not get meaning of how to design or how to achieve that. i.e. If i have written simple program in java (suppose) and i want to make it multi-tenant, then what changes and/or configuration needed?</p>
  
  <p>Thank you.</p>