title: concurrent excel file writing
body: <p>Is it possible to write a program in java where multiple resources can write into an excel sheet concurrently? Say for example, requests are comming in. For each request, 4 rows are updated. So when 70 users are accessing the file at the same time, 70*4 rows need to be updated simultaneously. When i tried it with synchronisation process, I encountered a issue with deadlock. Is it possible to achieve this without multithreading? </p>