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If a servlet implements Single thread model interference ,How servlet container ensure that servlets handle only one request at a time ? Even single thread model interface has no methods too.Thanks.
The servlet container creates a pool of servlet instances, and keeps track of which instances are currently ‘in use’. If all of the instances are ‘in use’ when a new request comes in, the container could either wait for an existing one to become free, or create a new instance to handle the request.
The single thread model isn’t widely used though – it’s better to make the servlet itself stateless, and allow several requests to be handled simultaneously.