With all possible improvements, if concurrency is maintained in terms of request handling, performance can be improved. There might be a case when load testing is performed with multiple concurrent hits to our application, and it may affect our application’s performance. In such cases, we should tune up the thread defaults on the Tomcat server. In the event that there is high concurrency, the HTTP requests will be put on hold until a thread becomes available to process them.

The default server thread implementation can be extended by using the Executor framework within our business logic, to make concurrent asynchronous calls from within a method in a single thread execution flow.