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  • Storing large data in HTTP Session (Java Application)

    - by Umesh Awasthi
    I am asking this question in continuation with http-session-or-database-approach. I am planning to follow this approach. When user add product to cart, create a Cart Model, add items to cart and save to DB. Convert Cart model to cart data and save it to HTTP session. Any update/ edit update underlying cart in DB and update data snap shot in Session. When user click on view cart page, just pick cart data from Session and display to customer. I have following queries regarding HTTP Session How good is it to store large data (Shopping Cart) in Session? How scalable this approach can be ? (With respect to Session) Won't my application going to eat and demand a lot of memory? Is my approach is fine or do i need to consider other points while designing this? Though, we can control what all cart data should be stored in the Session, but still we need to have certain information in cart data being stored in session?

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  • FAT filesystem analysis tool

    - by Andy
    I have a dump a FAT file system. Is there a windows tool I can use to analyse it, including: Provide basic information (sector size etc.) Validate the file system, basic corruption checking Allow the files and directory structure to be viewed and possibly edited (i.e mounting as a windows partition) Thanks, Andy

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  • How to boot linux direct to application on console with no login

    - by amanda
    I have a need to start an application on bootup on the linux console and I do not have a need for any type of login or security. I do not need any ALT-F1,F2,etc virtual consoles but I would like to allow SSH access via the network port for debugging, loading, etc. The application is a SDL graphics program running with fbcon as the SDL_VIDEODRIVER if that matters. I'm currently using Fedora 10 and 12 but any distro that supports SDL using the fbcon framebuffer would be acceptable.

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  • Streaming flash video does not work on my Mac OS X

    - by dehmann
    Flash videos do not work properly on my Mac. On this Vimeo video, for example, it shows only the beginning frame, and audio stutters like crazy, playing audio for a quarter second or so, then silence, then playing again, etc. I have Flash version 10,0,42,34 on Mac OS 10.5.8. It's a PowerBook G4 (PPC). I tried it in Firefox 3.5.5 and Safari 4.0.3. I tried reinstalling Flash, restarting the computer, and using a fresh user profile in Firefox (so that no extensions are interfering with the site), loading the video fully before playing, but nothing helps. I noticed that youtube videos work better, once loaded enough, although the picture does halt briefly once every 10 or so seconds, even when it's fully loaded.

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  • How Do I Export Pages from Browser with Embedded Hyperlinks?

    - by Volomike
    Made a sad discovery today. I have Ubuntu 10.04 LTS. My client is in the ad business and she had a marketing competition task for me. She wanted me to visit websites of the competitors, and export the home pages as PDF. However, she wanted me to do so with embedded hyperlinks. As it turns out, Firefox (and even the latest Chrome) on Ubuntu 10.04 LTS do not embed hyperlinks in PDF web page exports. Sure, there are several Chrome and FF plugins that let you export as PDF, but what these do is connect to the URL remotely, generate the PDF remotely, and then force a download in your browser to download it from a remote location. That's not good for me, though, because some of these competitor pages require an initial login. That means that all I get back on the PDF printing from these FF or Chrome plugins is a login page. Is there a way to get around this problem, to fix the broken PDF printer on Ubuntu 10.04?

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  • How to create a readonly root linux: Can be mounted as writeable for persistent changes?

    - by Mr Anderson
    I'd like a read only file system that runs almost entirely in RAM but the compact flash or hardrive can be mounted and made writeable to make persistent changes. How do I do this on Linux? I've looked at several tutorials but none really explain how to create such a system with the option of being able to mount the storage device and make persistent changes. I looked at this so far: http://chschneider.eu/linux/thin_client/ I also looked on the old gentoo wiki but the article was very specific to Gentoo. I'll be using a debian based Linux but it would be nice I've someone could explain to me how to do this in pretty generic instructions ,that would work on any Linux distro. Thanks.

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  • Tip #13 java.io.File Surprises

    - by ByronNevins
    There is an assumption that I've seen in code many times that is totally wrong.  And this assumption can easily bite you.  The assumption is: File.getAbsolutePath and getAbsoluteFile return paths that are not relative.  Not true!  Sort of.  At least not in the way many people would assume.  All they do is make sure that the beginning of the path is absolute.  The rest of the path can be loaded with relative path elements.  What do you think the following code will print? public class Main {    public static void main(String[] args) {        try {            File f = new File("/temp/../temp/../temp/../");            File abs  = f.getAbsoluteFile();            File parent = abs.getParentFile();            System.out.println("Exists: " + f.exists());            System.out.println("Absolute Path: " + abs);            System.out.println("FileName: " + abs.getName());            System.out.printf("The Parent Directory of %s is %s\n", abs, parent);            System.out.printf("The CANONICAL Parent Directory of CANONICAL %s is %s\n",                        abs, abs.getCanonicalFile().getParent());            System.out.printf("The CANONICAL Parent Directory of ABSOLUTE %s is %s\n",                        abs, parent.getCanonicalFile());            System.out.println("Canonical Path: " + f.getCanonicalPath());        }        catch (IOException ex) {            System.out.println("Got an exception: " + ex);        }    }} Output: Exists: trueAbsolute Path: D:\temp\..\temp\..\temp\..FileName: ..The Parent Directory of D:\temp\..\temp\..\temp\.. is D:\temp\..\temp\..\tempThe CANONICAL Parent Directory of CANONICAL D:\temp\..\temp\..\temp\.. is nullThe CANONICAL Parent Directory of ABSOLUTE D:\temp\..\temp\..\temp\.. is D:\tempCanonical Path: D:\ Notice how it says that the parent of d:\ is d:\temp !!!The file, f, is really the root directory.  The parent is supposed to be null. I learned about this the hard way! getParentXXX simply hacks off the final item in the path. You can get totally unexpected results like the above. Easily. I filed a bug on this behavior a few years ago[1].   Recommendations: (1) Use getCanonical instead of getAbsolute.  There is a 1:1 mapping of files and canonical filenames.  I.e each file has one and only one canonical filename and it will definitely not have relative path elements in it.  There are an infinite number of absolute paths for each file. (2) To get the parent file for File f do the following instead of getParentFile: File parent = new File(f, ".."); [1] http://bt2ws.central.sun.com/CrPrint?id=6687287

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  • Usage of putty in command line from Hudson

    - by kij
    Hi, I'm trying to use putty in command line from an hudson job. The command is the following one: putty -ssh -2 -P 22 USERNAME@SERVER_ADDR -pw PASS -m command.txt Where 'command.txt' is a shell script to execute in the server through SSH. If i launch this command from the Window command prompt, it works, the shell script is executed on the server machine. If i launch a build of the hudson job configured with this batch command, it doesn't work. The build is running... and running... and running.. without doing anything, and i have to stop it manually. So my question is: Is it possible to launch an external programm (i.e. putty) from an hudson job ? ps: i tried SSH plugin but... not a really good plugin (pre/post build, fail status of the commands launched not caught by hudson, etc.) Thanks in advance for your help. Best regards. kij EDIT: These are the build logs: [workspace] $ cmd /c call C:\WINDOWS\TEMP\hudson7429256014041663539.bat C:\Hudson\jobs\Artifact deployer\workspace>putty -ssh -2 -P 22 USER@SERV_ADD -pw PASS -m com.txt Le build a été annulé Finished: ABORTED And the Hudson.err.log file at the same time (after a stop): 3 juin 2010 18:27:28 hudson.model.Run run INFO: Artifact deployer #6 aborted java.lang.InterruptedException at java.lang.ProcessImpl.waitFor(Native Method) at hudson.Proc$LocalProc.join(Proc.java:179) at hudson.Launcher$ProcStarter.join(Launcher.java:278) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:83) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:601) at hudson.model.Build$RunnerImpl.build(Build.java:174) at hudson.model.Build$RunnerImpl.doRun(Build.java:138) at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:416) at hudson.model.Run.run(Run.java:1241) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:124) My shell script only write "hello" in a "hello.txt" file on the server, and nothing is done.

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  • How can videos from Ubuntu drive appear on web page and play in an embedded Flash Player?

    - by nLinked
    I have a shared folder on Ubuntu Server 12.04. Users drop videos in. Ubuntu runs a Cron task to convert them to FLV format and put them into another folder. All I would like is a simple web page that displays all the files in that folder as links, and when you click on the link for the video you want to play, it should play in the same web page inside an embedded Flash/SWF player. Sounds really basic but I'm actually struggling to find a simple solution. Any thoughts appreciated!

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  • Which Linux distribution for vehicle LCD instrument panel

    - by Brent
    I will be designing an instrument panel for a vehicle to display the common gauges that you would find in a car - (speedometer, rpm, fuel level, oil pressure, etc.). We have selected a 7" LCD and are in the process of narrowing down the hardware (This will use an ARM processor). The idea is to read these values off of the CAN Bus and update the UI with those values. This needs to have a fairly quick boot time, 5-10 seconds would be acceptable from the time the ignigtion is turned on to the time the UI is running. I have been doing a lot of research on which linux distribution to use, but I wanted to ask the question here to get the community's suggestions. I have been a .NET programmer for years, so linux is a new world to me. Here is what I have found so far... Tizen is geared for In-Vehicle Infotainment (IVI) (plus some others). However, this project is not an IVI, and I do not need the phone dialer, navigation, etc. Meego is dead, and Tizen seems to be the replacement Angstrom, Debian... would either of these be useful? I am not tied to a particular programming language or IDE. Any help and direction is appreciated!

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  • Serveur d'application Java : Téléchargez SpringSource Tc Server 2.0, un Apache Tomcat optimisée et a

    SpringSource annonce la sortie de Tc Server 2.0, un Tomcat packagé et supporté par SpringSource. Ce produit est décliné en trois version : Standard Edition : Un tomcat préconfiguré, optimisé et amélioré par des fonctionnalités d'administration et de diagostic. Spring Edition : Un Tomcat specialement conçu pour déployer des applications Spring. Celui-ci, en utilisant une version instrumentée des JAR de Spring, permet d'avoir du monitoring très détaillé sur le fonctionnement des applications. Developer Edition : Gratuite, c'est une version de tomcat dédié au développement, permettant dans le cas d'application Spring (et en particulier Spring MVC) d'avoir des informations sur le fonctionnement de l'application

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  • Apache Tomcat Server Error

    - by Sam....
    I M trying to install Tomcat But Getting this Error Every Time ..whether it is binary or Exe install *SEVERE: Begin event threw exception java.lang.ClassNotFoundException: org.apache.catalina.core.AprLifecycleListener at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.apache.commons.digester.ObjectCreateRule.begin(ObjectCreateRule.java:204) at org.apache.commons.digester.Rule.begin(Rule.java:152) at org.apache.commons.digester.Digester.startElement(Digester.java:1286) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.commons.digester.Digester.parse(Digester.java:1572) at org.apache.catalina.startup.Catalina.start(Catalina.java:451) at org.apache.catalina.startup.Catalina.execute(Catalina.java:402) at org.apache.catalina.startup.Catalina.process(Catalina.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:202) * Can any one please solve this...need urgent rly

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