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Servlets that make database transactions, sessions objects manipulation etc need to be implemented via synchronization to secure data from corruption and miss information if you do this then your multi threading environment will behave as single threaded environment since a thread must wait to obtain the lock on a shared synchronized resource. This is just a Payara-only-Feature and shouldn't have been tagged J[... But for 1000 to 10000 devices its not practical to implement SingleThreadModel because it process only single request at a time meanwhile all remaining requests must have to wait in queue. I will now try this tiny ad:.

Sign up using Email and Password. Local variables are not affected by multiple threads. This is completely backwards. Main Java SE Development... In this case if a request for the servlet arrives while another one is still processing, the server must either queue the request, or return an error to the browser.

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This is just a Payara-only-Feature and shouldn't have been tagged J[... If a servlet implements SingleThreadModel interface, servlet container can create one or multiple instance of the servlet depend on the request load. SingleThreadModel was designed to be an easy solution to low-load concurrency, but it didn't even manage that:. Stack Overflow works best with JavaScript enabled. Servlets are not thread safe and you have to synchronize your code manually what usually leads to esoteric implementations. Post Your Answer Discard By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

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Now plz explain how the servlet container keep another request in queue and is only variable having scope of service method and service method are thread-safe... In single thread model, each request thread has an instance of the servlet to itself - it is the normal servlet that has only one instance shared by all request threads. Wow I like your predictions and I hope that most if not all will come true. LuiggiMendoza yes, but it does make save us from data corruptions or miss information like wrong bank balance information.

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v18 Thread safety in Servlets. Time: 8:08

Do not use it. 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". Container developers are free to choose any of the three options, but most seem to prefer using option 3, the servlet instance pool. Aniket Aniket 1,242 3 23 44. It solves thread safety issues but not all of them.

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But in future there may hit multiple thousands requests to servlet because it is web services application accessed from multiple devices. Email Required, but never shown. Is session object thread safe. I need to clear this concept. The javadoc says why.

What is SingleThreadModel in Servlets?

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By simply removing the object field and replacing it with a local variable, this particular threading problem is resolved. Because my servlet is by default multithreaded its failed to process all requests. It still achieves that purpose. Each thread operates seaparate servlet "object "??? In that case each request processed separately, so remaining requests must wait in queue. Post Your Answer Discard By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

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Take the state out of your servlet instead, so that the same servlet can be used by multiple threads concurrently. If it can't achieve what it was designed for, it should not be used. Servlets that make database transactions, sessions objects manipulation etc need to be implemented via synchronization to secure data from corruption and miss information. It solves thread safety issues but not all of them. Servlets can be accessed simultaneously by multiple threads, and therefore should always be written in a thread safe manner.

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Container developers are free to choose any of the three options, but most seem to prefer using option 3, the servlet instance pool. Take the state out of your servlet instead, so that the same servlet can be used by multiple threads concurrently. Question to an output. Since your servlet is successfully serving multiple request, there is a chance that the container is actually restricting number of request at a time, which you can configure. This is just a Payara-only-Feature and shouldn't have been tagged J[... Veena Point ] What is pool of servlet?

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Do not use it. So any one suggest me any other solution other than implementing SingleThreadModel which will degrade performance of my application. Main Java SE Development...

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I need to clear this concept. Objects that are accessible to more than one servlet instance at a time, such as instances of HttpSession, may be available at any particular time to multiple servlets, including those that implement SingleThreadModel. Post as a guest Name. 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". When a request is received for a servlet marked as SingleThreadModel the server can deal with it in one of three ways:

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  1. Problem with session information. But for 1000 to 10000 devices its not practical to implement SingleThreadModel because it process only single request at a time meanwhile all remaining requests must have to wait in queue. Originally posted by yogendra singh: To handle the requests, the Servlet Developer must make adequate provisions for concurrent processing with multiple threads in the service method. Which will be thread-safe when i implement my servlet to single thread model. Objects that are accessible to more than one servlet instance at a time, such as instances of HttpSession, may be available at any particular time to multiple servlets, including those that implement SingleThreadModel.
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  2. I'm not sure that just telling you the answer will help you learn and understand. Email Required, but never shown. Post as a guest Name. For me it makes sense in this context[... Is from an exam or homework question? SingleThreadModel was designed to be an easy solution to low-load concurrency, but it didn't even manage that:
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Sign up using Facebook. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Email Required, but never shown. Stack Overflow works best with JavaScript enabled.

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This is the question i came across while readinf some faq. Correct me if I am wrong. Hibernate -- or Topics for the 55th airhacks.

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Take the state out of your servlet instead, so that the same servlet can be used by multiple threads concurrently. Stack Overflow works best with JavaScript enabled. In this case if a request for the servlet arrives while another one is still processing, the server must either queue the request, or return an error to the browser. Thanks a lot for providing such a nice clear-cut picture..

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However, thanks for wat[... In fact you don't need it, instead use local variables instead of object fields since "each thread gets its own copy of local variables in Java. Note that SingleThreadModel does not solve all thread safety issues.

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