title: Using data to create excel sheet
body: <p>I have a requirement in a web application to show a certain number of steps with a planned start and end time associated with each step.</p>
  
  <p>These steps are read from an excel sheet , which is stored in db in binary format. Once I display the excel using Apache POI and Guava table(as seen in screenshot), I need to be able to capture the actual start and end time corresponding to each step. Using these actual times I need to create a replica of the initial sheet  putting in actual times. </p>
  
  <p>Now I do not want to store the details in DB corresponding to each step, but thinking of any object like say a map storing key as task number and value as a combination of start and end time.</p>
  
  <p>My only concern is how to persist this object among different sessions. Any advice on better alternative?</p>
  
  <p><a href="https://i.stack.imgur.com/kgp83.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kgp83.png" alt="enter image description here"></a></p>