For(a servlet container may create multiple instances) that, anything we want do in programmatically?
There is no such interface as Multi Threaded Model. This means a single instance can be accessed by more than one thread.
Different variables in both models thread safe or not:- 1.
Can i get some more clarifications regarding to avoid the performance problem, a servlet container may create multiple instances of the servlet class., concentrate on writing a thread-safe multi-threaded servlet.See Section 10.4.2 for details on writing efficient thread-safe code.It is strongly recommended that Developers not synchronize the service method (or methods dispatched to it) in these circumstances because of detrimental effects on performance".Note that Single Thread Model does not solve all thread safety issues.
Singlethreadmodel in servlet
"A servlet container may send concurrent requests through the service method of the servlet.To handle the requests, the Servlet Developer must make adequate provisions for concurrent processing with multiple threads in the service method.Other concurrent requests would wait until the current request was processed before starting execution.If your servlet received an average of one request per second and the processing took an average of half a second, then this implementation is adequate. You are currently viewing the Servlets section of the Wrox Programmer to Programmer discussions.
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This is a community of tens of thousands of software programmers and website developers including Wrox book authors and readers. By joining today you can post your own programming questions, respond to other developers questions, and eliminate the ads that are displayed to guests. By default servelts are intrinsically multithreaded, which means that a single instance can can be accessed by more than one thread. Cheers Martyn There is no such interface as Multi Threaded Model. This means a single instance can be accessed by more than one thread.The Single Thread Model Interface is deprecated in this version of the specification.The servlet programmer should implement Single Thread Model interface to ensure that servlet can handle only one request at a time. This interface is currently deprecated since Servlet API 2.4 because it doesn't solves all the thread-safety issues such as static variable and session attributes can be accessed by multiple threads at the same time even if we have implemented the Single Thread Model interface. However, servicing requests sequentially seriously hurts performance.To avoid the performance problem, a servlet container may create multiple instances of the servlet class.