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  • debugging JBoss 100% CPU usage

    - by NateS
    Originally posted on Server Fault, where it was suggested this question might better asked here. We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • ASP.NET access a folder as ASPNET even though impersonation is set

    - by Ron Harlev
    I have my ASP.NET web.config set with impersonation <identity impersonate="true" userName="domainName\userName" password="userPassword" /> I'm running some a method like IO.Directory.GetFiles(somePath) And monitoring the file system access with Process Monitor I keep getting all the access requests from the aspnet_wp.exe process to the folder, as the ASPNET user. Why am I not seeing the access as the impersonated user?

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  • Why Rails.cache is not thread safe?

    - by Freewind
    I know Rails.cache is ActiveSupport::Cache::MemoryStore, and it is not thread safe. I don't understand, why rails use a thread-unsafe cache as its default? Why not use ActiveSupport::Cache::SynchronizedMemoryStore? In my opinion, in a web site, if a cache is not thread-safe, it almost useless, because the requests are not handled in ONE thread. Do you use Rails.cache in you webapp? And how do you use it?

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  • maintain pageViews in global.asax (asp.net)

    - by nishant
    I need a function in global.asax file which gets called only once when user enter a page url. application_beginrequest gets called 50-60 times in a single page( as to render a page several requests go to server.) i though of a solution - I can write my fucntion in global.asax and call it on page load of other pages but in that solution I need to call it in every page. I would prefer something which is to be done only in global.asax

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  • jGrowl with asp.net server side processing

    - by Mike
    Hi, Is it possible to create a new thread in asp.net to do some processing, and then upon completion, set a flag so that when the user requests the next page, I can insert some extra text or code to perform some notification? Or if it is possible to send some text to the browser after the request has completed? For example jGrowl would be great to have a notification after some processing has been performed. Thanks

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  • [C#] WebClient construction overhead

    - by Barguast
    I have a client which makes a limited number of concurrent web requests. I use WebClient for this purpose. I currently have a pool of WebClient-s which I create once and use whichever one is idle. This approach is becoming a little cumbersome though, and I'm wondering if there is any benefit to having a collection of pre-constructed WebClient instances, or if creating them on the fly wouldn't be too much trouble?

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  • What this Url ending means .....&123 ?

    - by simple
    Hey I am having some issues while using Nggalley plugin for wordpress the plugin makes use of a JW player and JW player needs an XML - so it requests link like this http://nextgen-gallery.com/index.php?callback=imagerotator&gid=1&149 The lay &xxx really creaps me out couse I am using it for joomla and joomla doesn't like this I am assuming that this has to do with wordpress but still unsure. what does this ending of URL really mean? PS. I would never ever use wordpress plugin in joomla but my client uses and I have to fix it

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  • Facebook dialogs keep popping up in Firefox

    - by Pierre Olivier Martel
    I have a facebook application running in a FBML canvas and I have a problem with dialogs (either extended permissions or stream publish dialogs). Once they popup, they keep popping up for every subsequent requests. I've tested it in Chrome and everything works fine. It seems that the URL is chained in Firefox, which gives cryptic long urls like : http://apps.facebook.com/webdweller-po/discover?_fb_q=1&_fb_qsub=apps.facebook.com#!/webdweller-dev/?_fb_q=1&_fb_qsub=apps.facebook.com Did anybody experienced such a bug?

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  • IIS7 Request Mapping, File Extensions

    - by user189049
    I have a website that used to have .dsp file extensions for all pages. There are alot of other sites referencing mine that reference the pages like that, but my pages are all actually .aspx pages. In IIS5, I was able to configure this to work. My problem is I've recently switched from IIS5 to IIS7, and I have no idea how to map these requests (.dsp) to the real file (.aspx) without the server telling me the file doesn't exist.

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  • GET request in AJAX-retrieved HTML

    - by ufw
    There is some HTML code which appears on the page as the result of AJAX request/response. This HTML contains GET requests to another php script. Links containing this requests are not working while "real" HTML (added on the page manually) works normally. When I open the page source with Ctrl+U I see empty div's (but they actually have HTML retrieved via AJAX) and the full-fledged HTML code added manually. Can't figure out how can I make the AJAX-retrieved links working. This is how I try to form the HTML code which must be added to the page as the result of AJAX response. <?php //some selections from the database... //all subsequent varibles are the members of $row=(mysql_fetch_array($query)) array; $html_to_be_inactive = '<li id="productID_' . $productID . '"> <a href=work.php?action=deleteFromBasket&productID=' . $productID . ' onClick="return false;"> <img src="images/delete.png" id="deleteProductID_' . $productID . '"> </a> ' . $productName . '(' . $totalItems . ' items) - $' . ($totalItems * $productPrice) . '</li>'; echo $html_to_be_inactive; ?> And that is it, result of 'echo' appears on the page after successful AJAX request as the simple HTML, and it does nothing when I click the link. I do not perform DOM 'append' methods as I'm not familiar with DOM yet. I can see all the elements mentioned in $thml_to_be_inactive but the link seems to be really inactive. Also this HTML is absent in the "Ctrl+U" output, I can see it only when I select "Inspect element" in the browser. The HTML which was added manually operates the same items as usual, but I need AJAX-retrieved HTML to be working as well. I suspect I need to perform some 'append' method via JavaScript or jQuery, but I don't know how to do it in a proper way. Thanks.

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  • Checking jQuery AJAX Request Status

    - by mTuran
    Hi, i do 2 different ajax request via jQuery and i have to check the other one is active or not. How can i do that ? one of example from my ajax requests: active_project_categories_ajax = $.ajax( { url: "/ajax/get_skill_list", dataType: 'json', ...... }); i need something like that: active_project_categories_ajax.status()

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  • ASP/AJAX - How to get the time between an server request and response?

    - by Julian
    Whenver Ajax requests new data from the server this can sometimes take a a second or two. Now I want to know, how can I get this time between the ajax request and the response it gets from the server? I need this because an ajax timer I'm running ain't perfectly doing his stuff. It got some delay whenever it needs to reset to it's original time. Thanks in Advance. Edit: Help needed fast please, just try.

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  • Can MKS Integrity integrate with other source control tools? (SVN, Git...)

    - by bnsmith
    My boss is interested in using MKS Integrity for bug tracking, feature requests, Wiki documentation and so on. However, we currently use Subversion, and he doesn't want to force us devs to use a version control system that we don't like. Is is possible to integrate a different version control program into MKS Integrity? I'm particularly interested in SVN, Git, Mercurial and Bazaar. If you've tried mixing tools like this before, I'd love to hear about your experiences.

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  • [Python] TFTP server

    - by www.yegorov-p.ru
    Hello. Are there any modules for python, that can be used as tftp server? I tried Tftpy, but when I try to upload something, it says: ERROR:tftpy:Write requests not implemented at this time. In fact, it's the only function that I need.

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  • Can I pass a querystring that translates to a List<int> on the server?

    - by Denis Hoctor
    Hi all, I'm writing a Google Maps app that requests data from the server using jQuery's $.ajax() to send the request to my MVC Contoller. This control expects a List for the category types. What should the querystring look like for this? I've tried http://localhost:9090/mapamenities?amenityTypes=1,5 http://localhost:9090/mapamenities?amenityTypes=[1,5] with no luck. The SearchRquest attribute I'm trying to bind to is public List AmenityTypes { get; set; } Thanks Denis

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  • Maximum Uri Length in Silverlight

    - by Kris Erickson
    Does anyone know what the Maximum URL length is in Silverlight (version 4 if it matters)? I know it is 2048 and basically infinite for Firefox (the two environments I have tested in), but Image requests fail for long Uri's. Anyone know the magic number (is it 256 the max filepath length?) It is considerably shorter than the 2048 for IE...

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  • Tool to monitor HTTP traffic

    - by Samuh
    I have an application on my iPhone which sends out Http requests; is it possible to look into the HTTP stream using some tool?? I use standalone version of (IEInspector's) HttpAnalyzer tool on my windows PC to monitor HTTP traffic from all processes including the apps on Android phone (thanks to android debug bridge interface). Is there a similar tool for OS X that I can use for iPhone apps? Is this even allowed? Thanks in advance.

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  • Why do i need PUT or DELETE Http Verbs ?

    - by Barbaros Alp
    After the release of MVC 2, i have started to check and play with the new features. But i couldnt understand that why do i need to use PUT or DELETE verbs ? I have searched about it and read some articles but i couldnt get it. What is the main purpose of DELETE and PUT (and do they have any advantages rather than using a GET or POST method) even though i can handle all of the requests with GET and POST...

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  • How to use Facebooks Graph-API from a Servlet

    - by Eric
    Hi everyone, I need to access Facebook from a J2EE-App (serverside). I first had a look at this project: http://code.google.com/p/facebook-java-api/ , but as I need to create Facebook-Events and invite people this does not help. So I guess I need to use the Graph API, but Igot no clue on how to perform those HTTP POST requests needed - especially how to append the nedded attributes.

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  • What to do when you need more verbs in REST

    - by Richard Levasseur
    There is another similar question to mine, but the discussion veered away from the problem I'm encounting. Say I have a system that deals with expense reports (ER). You can create and edit them, add attachments, and approve/reject them. An expense report might look like this: GET /er/1 => {"title": "Trip to NY", "totalcost": "400 USD", "comments": [ "john: Please add the total cost", "mike: done, can you approve it now?" ], "approvals": [ {"john": "Pending"}, {"finance-group": "Pending"}] } That looks fine, right? Thats what an expense report document looks like. If you want to update it, you can do this: POST /er/1 {"title": "Trip to NY 2010"} If you want to approve it, you can do this: POST /er/1/approval {"approved": true} But, what if you want to update the report and approve it at the same time? How do we do that? If you only wanted to approve, then doing a POST to something like /er/1/approval makes sense. We could put a flag in the URL, POST /er/1?approve=1, and send the data changes as the body, but that flag doesn't seem RESTful. We could put special field to be submitted, too, but that seems a bit hacky, too. If we did that, then why not send up data with attributes like set_title or add_to_cost? We could create a new resource for updating and approving, but (1) I can't think of how to name it without verbs, and (2) it doesn't seem right to name a resource based on what actions can be done to it (what happens if we add more actions?) We could have an X-Approve: True|False header, but headers seem like the wrong tool for the job. It'd also be difficult to get set headers without using javascript in a browser. We could use a custom media-type, application/approve+yes, but that seems no better than creating a new resource. We could create a temporary "batch operations" url, /er/1/batch/A. The client then sends multiple requests, perhaps POST /er/1/batch/A to update, then POST /er/1/batch/A/approval to approve, then POST /er/1/batch/A/status to end the batch. On the backend, the server queues up all the batch requests somewhere, then processes them in the same backend-transaction when it receives the "end batch processing" request. The downside with this is, obviously, that it introduces a lot of complexity. So, what is a good, general way to solve the problem of performing multiple actions in a single request? General because its easy to imagine additional actions that might be done in the same request: Suppress or send notifications (to email, chat, another system, whatever) Override some validation (maximum cost, names of dinner attendees) Trigger backend workflow that doesn't have a representation in the document.

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  • Most useful jQuery plugins

    - by Binoj Antony
    Which are the most useful jQuery plugins you have used. List out one per answer(to rank the best plugins individually), and describe what it does as well. BlockUI - Can block certain elements (or the whole page) during ajax requests. Form Plugin JQueryUI JQuery Validation TableSorter Taconite

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  • Upload a Photo to Facebook with REST API and Ruby

    - by Michael Waxman
    It's much harder than you'd think: http://wiki.developers.facebook.com/index.php/Photos.upload The tricky part is how to create the MIME multi-part message in Rails, which Facebook requires. I'm also using a Ruby Facebook API gem (mini_fb) which signs my other requests, and in addition to having no idea how to set up the MIME multi-part, even if I did I'm not sure how to add in the required signature values with the gem. Please help!

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