Tony Puthenveettil

What you mean by Java server? are you planning to develop server container like Tomcat/JBoss or server-client (web) application? I hope you meant web application. If so, you have a lot of options like JSP, Spring & Angular. Without knowing the exact requirement, it's difficult to suggest exact technology stack. It's based on the requirement.

A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the rate of heat transfer that results in the melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours.[1][2] A refrigeration ton is approximately equivalent to 12,000 BTU/h or 3.5 kW. Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of refrigeration). Many manufacturers also specify capacity in BTU/h, especially when specifying the performance of smaller equipment. https://en.wikipedia.org/wiki/Ton_of_refrigeration