Avoid using servlets that must be single-threaded. One instance of a single-threaded servlet can serve only one client at a time, while thread-safe servlets can serve all clients with one instance.
If you cannot avoid using a single-threaded servlet, configure the number of instances to minimize blocked client requests (requests block if there are more requests than available instances). For more information, see “Threading settings” in Chapter 22, “Creating Java Servlets,” in the EAServer Programmer’s Guide.
