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  • In a SSL web application, what would be the vulnerabilities of using session based authentication?

    - by Thomas C. G. de Vilhena
    I'm not sure the term even exists, so let me explain what I mean by "session based authentication" through some pseudo-code: void PerformLogin(string userName, string password) { if(AreValidCredentials(userName, password)) { Session.Set("IsAuthenticated", true); } else { Message.Show("Invalid credentials!"); } } So the above method simply verifies the provided credentials are valid and then sets a session flag to indicate that the session user is authenticated. Under plain HTTP that is obviously unsafe, because anyone could hijack the session cookie/querystring and breach security. However, under HTTPS the session cookie/querystring is protected because client-server communication is encrypted, so I believe this authentication approach would be safe, wouldn't it? I'm asking this because I want to know how authentication tickets can improve web applications security. Thanks in advance!

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  • LibreOffice Math problem with greek letters

    - by Matheus de Araújo
    I've a problem with my LibreOffice. Using an old archive that I have (with the Maxwell's equations), the greek letters are like squares. I tried to change something in the alphabet but even the font don't have any greek letters (they appear like squares too), both Greek and iGreek letters package. Sounds like a packet that isn't installed or corrupted, but I still redownloaded and reinstalled the LO and I don't know whose I have to install. With the OO my equations worked well (I made the file with it). What am I supposed to do?

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  • Java Spotlight Episode 98: Cliff Click on Benchmarkings

    - by Roger Brinkley
    Interview with Cliff Click of 0xdata on benchmarking. Recorded live at JFokus 2012. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Bean Validation 1.1 Java EE 7 Roadmap Java JRE Update 7u7 and 6u35 available. Change to Java SE 7 and Java SE 6 Update Release Numbers JCP 2012 Award Nominations Announced Griffon JavaFX Plugin Events Sep 3-6, Herbstcampus, Nuremberg, Germany Sep 10-15, IMTS 2012 Conference,  Chicago Sep 12,  The Coming M2M Revolution: Critical Issues for End-to-End Software and Systems Development,  Webinar Sep 30-Oct 4, JavaONE, San Francisco Oct 3-4, Java Embedded @ JavaONE, San Francisco Oct 15-17, JAX London Oct 30-Nov 1, Arm TechCon, Santa Clara Oct 22-23, Freescale Technology Forum - Japan, Tokyo Nov 2-3, JMagreb, Morocco Nov 13-17, Devoxx, Belgium Feature Interview Cliff Click is the CTO and Co-Founder of 0xdata, a firm dedicated to creating a new way to think about web-scale data storage and real-time analytics. I wrote my first compiler when I was 15 (Pascal to TRS Z-80!), although my most famous compiler is the HotSpot Server Compiler (the Sea of Nodes IR). I helped Azul Systems build an 864 core pure-Java mainframe that keeps GC pauses on 500Gb heaps to under 10ms, and worked on all aspects of that JVM. Before that I worked on HotSpot at Sun Microsystems, and am at least partially responsible for bringing Java into the mainstream. I am invited to speak regularly at industry and academic conferences and has published many papers about HotSpot technology. I hold a PhD in Computer Science from Rice University and about 15 patents. What’s Cool Shaun Smith’s Devoxx 2011 talk "JPA Multi-Tenancy & Extensibility" now freely available at Parleys.

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  • How to get warnings when compiling fx files

    - by jdv-Jan de Vaan
    When I compile DirectX shaders (.fx files), I dont see any compiler warnings unless there was an error in the effect. This happens both when using the offline FXC compiler, as well as calling SlimDx's CompileEffect (which is what we normally do). I could force warnings as errors (/WX), but if you enable that, you get an error that compilation failed, without the warning that caused the problem. So how can I output warnings for shaders that compile properly?

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  • Ubuntu unstable, showing awkward behavior

    - by Christophe De Troyer
    Let me start off by saying that this problem can't be described in such a way that allows me to find other topics, which have some relevance to this problem. That's why I created this question. In case this question might have been asked before, I apologize. So what is the problem: My computer (Intel Core I5 2500K - with HD3000 graphics -, 6 gb DDR, 1 SSD, 3 HDD's and an Asus P8Z68 mobo) runs Windows on the SDD. But I decided to give Ubuntu a chance to be my daily OS for basic needs since it's open source and I find it a handicap of not being able to work with it. I decided to run the windows installer and install Ubuntu 12.04 to my 320 Gb hdd which was not being used in my computer. After installing it and booting it, it worked great! I spent the rest of the day/night using it, and falling for it. Great, today I booted Ubuntu (I had the choice in the bootloader as I expected). It asked me for my login and it started logging in. Now, after a few (literally) minutes of letting it "boot" I tried determining the cause of this. What I've figured out so far: When I left click on my desktop it freezes completely for a few seconds I have something like tearing in the left side menu (in games, you know) when I move my mouse around It runs well when just hovering around with my mouse, but from the point I click on something it freezes. What have I tried? I ran a HD Tune diagnostic on the HDD but the performance seems to be very close to the stock values, so I'm taking it as a good HDD. I'm trying to get to the drivers update panel for Ubuntu, but with the state it's in, it's taking a lot of time.. Could anyone point me in a direction for troubleshooting this? I'm not really a noob at all, just when using Linux.. :) Thanks in advance! Christophe,

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  • I cant install ubuntu 12.04 on my dell latitude d510

    - by Jose de Jesus
    I download the iso from Ubuntu.com and burned into a CD-R with the program in the page. The disc work right in my desktop but when i run it in my laptop appears another menu with the options prove ubuntu, install ubuntu, check the memory, check for errors, and run windows.When i try the option install appears in the screen "Ubuntu" in the center and littles points down (loading) and after 5 minutes the computer freeze. What can i do?

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  • What could be the reason for my resolution to be right running 11.10 on VirtualBox and not on machine?

    - by Hadrian de Oliveira
    When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well. But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox). What could be the reason for this happening? (Could the VB guest software influence on this?)

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  • Oracle Java Embedded Client 1.1 Released

    - by Roger Brinkley
    Yesterday an update release of Oracle Java Embedded Client (OJEC) 1.1 quietly slipped out door for general availability. Until last year it was pretty difficult to get your hands on either a Connected Limited Device Configuration (CLDC) for small devices or a Connected Device Configuration (CDC) for medium devices java implementation without a substantial initial commitment. But with the the release of OJWC (CLDC) and OJEC (CDC) last year that has changed. OJEC 1.1 is a binary distribution designed for installation on medium configurations which is a mid range processor requiring a  slow startup time, seamless upgrades, in a cost sensitive hardware environment  anywhere from 3.5mb to 8 mb. There are headless as well as headed versions available. It is intended for devices, such as Blu-­-ray Disc players, set-­-top boxes, residential gateways,VOIP phones, and similar. From a software point of view, OJEC is the Java runtime platform implementation of Connected Device Configuration (CDC v1.1, JSR-­-218), Foundation Profile (FP v1.1, JSR-­-219), and Personal Basis Profile (PBP v1.1, JSR-­-217)  and includes optional packages RMI (JSR 66), JDBC (JSR 169) and XML API for Java ME (JSR 280), and Java TV (JSR-­-927). New to this release is support for the XML API (JSR 280) and a number of bug fixes and performance enhancements, including an improved Just-in-Time (JIT) compilation for the x86 chipset architecture. The platforms supported include ArmV5, ArmV6/ArmV7, MIPS 32 74K, and X86 in headless mode. For embedded developers there are number of advantages to using Java and if you have shied away from the JavaME edition in the past I would encourage you to look into the updated version of OJEC 1.1.

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  • Power button missing

    - by Christophe De Troyer
    An almost clean install of Ubuntu 13.10 keeps hiding the power button. I noticed before that my clock and power button were missing in the right top corner. I rebooted my system and they were back. Now I see my power button only is missing. How do I go about fixing this? I can't keep rebooting, can I? The latest thing I did was removing Ubuntu One: Removing Ubuntu One I don't think I did something that might've tinkered with these settings though.

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  • Security in Robots and Automated Systems

    - by Roger Brinkley
    Alex Dropplinger posted a Freescale blog on Securing Robotics and Automated Systems where she asks the question,“How should we secure robotics and automated systems?”.My first thought on this was duh, make sure your robot is running Java. Java's built-in services for authentication, authorization, encryption/confidentiality, and the like can be leveraged and benefit robotic or autonomous implementations. Leveraging these built-in services and pluggable encryption models of Java makes adding security to an exist bot implementation much easier. But then I thought I should ask an expert on robotics so I fired the question off to Paul Perrone of Perrone Robotics. Paul's build automated vehicles and other forms of embedded devices like auto monitoring of commercial vehicles on highways.He says that most of the works that robots do now are autonomous so it isn't a problem in the short term. But long term projects like collision avoidance technology in automobiles are going to require it.Some of the work he's doing with his Java-based MAX, set of software building blocks containing a wide range of low level and higher level software modules that developers can use to build simple to complex robot and automation applications faster and cheaper, already provide some support for JAUS compliance and because their based on Java, access to standards based security APIs.But, as Paul explained to me, "the bottom line is…it depends on the criticality level of the bot, it's network connectivity, and whether or not a standards compliance is required."

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  • Adaptive Characters: AI Solution Needs a Problem

    - by Roger F. Gay
    Have sophisticated adaptive programming, will travel - so to speak. I'm part of a group that developed sophisticated learning / adaptive software for robotics. The system "thinks" via its simulator, building and adapting code on its own; and then carries out the best solution. The software can also adapt to new situations, etc. http://mensnewsdaily.com/2007/05/16/robobusiness-robots-with-imagination/ It's easy to imagine using it with automated game characters that will adapt to the players moves and style - the easiest example would be fighting. The more the simulated fighter fights with the human player, the more it learns to counter that players fighting skills. But there should be more. Anyone have any ideas as to how adaptive characters might be interesting in games?

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  • Looking for a customizable "Did you know..." dialog application

    - by Jorge Suárez de Lis
    I want to deploy a "Did you know..." or "Tip of the day" application at the office. It should: Show a dialog at login time with a random tip. Obviously, provide some way to store my own tips. Be easy to disable and reenable by the user itself. I'm using puppet, so I'm covered with the deployment. The tips don't even need to be gathered from a server, since I can deploy the newest tips file/database with no costs. Sure, I could hack a quick solution by using zenity and bash, but I'd like to know if there's any application out there specifically targeted at this. I don't like the zenity approach very much because it's very limited on the contents that can be displayed. No text alongside screenshots, for example. Zenity is aimed towards displaying simple dialogs.

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  • Redirect error in Google Webmaster Tools report

    - by Aurelio De Rosa
    I built a CMS and I used it to create the following website http://www.tkdmontecatini.com . After some days, Google Webmaster Tools started to give me several "Redirect error" on some pages like the follows: http://www.tkdmontecatini.com/it/photogallery http://www.tkdmontecatini.com/it/pagina/9/Informazioni/Corsi/Chi-Siamo http://www.tkdmontecatini.com/it/pagina/2/Informazioni/Eventi/Eventi The funny things are: If I access those links from a browser, it's all right and I've not redirect loops or other similar issues If I use the "Fetch as Googlebot" function, I get a great "Success" result Question: Any idea of why this happens and how can I fix it?

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  • Incorrect key mappings in remote NX session

    - by Roger Light
    I'm using the NoMachine provided NX client on Ubuntu 10.10 running on a laptop. I'm connecting to a FreeNX server that happens to be running on openSUSE. I'm having trouble with keys being incorrect in the remote session. The most noticable example is that when I press up cursor, the screen shot dialog appears instead. As far as I can gather easily, the cursor keys and delete are affected. It's worth noting that it doesn't display the same behaviour if I dual boot to Windows XP, or from a different machine using openSUSE. I'm not really sure where to begin looking. Any suggestions?

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  • Java Spotlight Episode 101: JavaOne 2012 Part 2 - Community Events

    - by Roger Brinkley
    An interview with Martijn Verberg on Adopt A JSR, Nichole Scott and John Yeary on Community, and Hellena O'Dell on the Oracle Musical Festival about community events and happenings at JavaOne 2012. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes Events Sep 30-Oct 4, JavaONE, San Francisco Oct 3-4, Java Embedded @ JavaONE, San Francisco Oct 15-17, JAX London Oct 30-Nov 1, Arm TechCon, Santa Clara Oct 22-23, Freescale Technology Forum - Japan, Tokyo Oct 31, JFall, Netherlands Nov 2-3, JMagreb, Morocco Nov 13-17, Devoxx, Belgium Feature InterviewAdopt a JSR Adopt a JSR Home Adopt OpenJDK Home LJC's Adopt a JSR jClarity - Java Performance Tuning for the Cloud Community Events at JavaOne User Groups at Oracle World and JavaOne To access the Java User Group content on Sunday, go to the content catalog for JavaOne and filter the search criteria to Sunday sessions Oracle Music Festival

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  • "Bad apple" algorithm, or process crashes shared sandbox

    - by Roger Lipscombe
    I'm looking for an algorithm to handle the following problem, which I'm (for now) calling the "bad apple" algorithm. The problem I've got a N processes running in M sandboxes, where N M. It's impractical to give each process its own sandbox. At least one of those processes is badly-behaved, and is bringing down the entire sandbox, thus killing all of the other processes. If it was a single badly-behaved process, then I could use a simple bisection to put half of the processes in one sandbox, and half in another sandbox, until I found the miscreant. This could probably be extended by partitioning the set into more than two pieces until the badly-behaved process was found. For example, partitioning into 8 sets allows me to eliminate 7/8 of the search space at each step, and so on. The question If more than one process is badly-behaved -- including the possibility that they're all badly-behaved -- does this naive algorithm "work"? Is it guaranteed to work within some sensible bounds?

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  • How do I get categories for a product in Magento [closed]

    - by Joost de Valk
    I'm trying to add product_type to my Magento Google Base output based on the product's categories, but I seem to be unable to. I have the following code: // Get categories from product to include as product_type $categoryIds = $object->getCategoryIds(); foreach($categoryIds as $categoryId) { $category = Mage::getModel('catalog/category')->load($categoryId); $this->_setAttribute('product_type', $category->getName(), 'text' ); } The issue is that it returns all of the categories, not just the ones the product is in. Anyone have a solution?

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  • So long Oracle

    - by Roger Brinkley
    This Friday (November 1, 2013) is my last day at Oracle. After Publishing almost 150 Java Spotlight Podcasts with over 800,000 downloads plus another 95 Mobile and Embedded Podcasts Being a founding member of Java.Net with the Desktop Community Starting and founding 3 separate Java.Net Communities. Visiting every continent save one and several cities around the world Traveling to more cities in Brazil than most Brazilians. Speaking at all major Java conferences and lots of Java User Groups Being the longest serving JavaOne Track Lead Meeting, working, and interviewing the best of the best in the Java community Creating JavaHelp the online help system for the Java Platform Most importantly having lots of fun (who else played hickory golf in 6 continents in one year) Its time for me to move on! I'll now be publishing content at http://www.rogerbrinkleyblog.info/ now onwards. Read my new blog to learn about my new adventures!

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  • Need to modify gnome 3 theme for browser

    - by Mario De Schaepmeester
    I have recently begun using the DarkGreen theme for Gnome 3, however there are some problems on some webpages in FireFox regarding text input fields. This happens in the search field on Google, some fields on Facebook, etc... This theme uses a dark background and light color text for input fields by defaut. I have managed to modify the foreground color of input text succesfully for those fields that were never affected (from near white to gray), but it doesn't help for the "broken" fields. I also want to change the background color for all input fields to white, but I get no luck with that either. In the theme folder there is a gtk folder with a css file. Here are the relevant contents: @define-color theme_base_color #202020; @define-color theme_text_color #25DC00; /* #ffffff */ @define-color theme_bg_color #121212; @define-color theme_fg_color @theme_text_color; @define-color selected_bg_color #3E8753; @define-color selected_fg_color #ffffff; @define-color theme_selected_bg_color @selected_bg_color; @define-color menu_bg_color #555555; @define-color menu_fg_color @theme_text_color; @define-color menu_combobox_border @theme_selected_bg_color; @define-color menu_separator mix (@theme_bg_color, @menu_bg_color, 0.90); @define-color insensitive_bg_color alpha(#0b0b0d, 0.0); @define-color insensitive_fg_color alpha(#717171, 0.50); @define-color insensitive_border_color alpha(#717171, 0.50); @define-color entry_text_color /* #fafafa */ #707070; @define-color entry_background_a #ffffff; @define-color entry_background_b #ffffff; @define-color entry_background_c #ffffff; @define-color entry_background_d #ffffff; /* 121212 */ @define-color frame_color #707070; Is this CSS file the only thing I would need to change?

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  • Java SE 8 (with JavaFX) Developer Preview Release for ARM

    - by Roger Brinkley
    In an effort to get ARM developers testing Java SE 8 before the scheduled release later this year a Java SE 8 Developer Preview Release for ARM has been made available. This release has been tested on the Raspberry PI but should work on other ARM platforms. In addition to the new Java SE features, this release provides specific support of hard float GPU on the Raspberry PI. The support for hard float GPU has been anticipated by a number of developers. Additionally, this release includes support of an optimized JavaFX. Specific configurations of JDK 8 on ARM are defined below: Java FX is supported on ARM architecture v6/7 (hard float) Supported platforms without Java FX: ARM architecture v6/7 (hard float) ARM architecture v7 (VFP, little endian) ARM architecture v5 (soft float, little endian) Linux x86 The download page includes setup instructions for a Raspberry PI device as well as demos and samples. Developers are also encouraged to try their own applications as well and to share their stories via the JavaFX or Project Feedback Forums.  If you've got a Raspberry PI or other ARM devices it's time to get started with Java SE 8 Developer Preview release.

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  • Preferred lambda syntax?

    - by Roger Alsing
    I'm playing around a bit with my own C like DSL grammar and would like some oppinions. I've reserved the use of "(...)" for invocations. eg: foo(1,2); My grammar supports "trailing closures" , pretty much like Ruby's blocks that can be passed as the last argument of an invocation. Currently my grammar support trailing closures like this: foo(1,2) { //parameterless closure passed as the last argument to foo } or foo(1,2) [x] { //closure with one argument (x) passed as the last argument to foo print (x); } The reason why I use [args] instead of (args) is that (args) is ambigious: foo(1,2) (x) { } There is no way in this case to tell if foo expects 3 arguments (int,int,closure(x)) or if foo expects 2 arguments and returns a closure with one argument(int,int) - closure(x) So thats pretty much the reason why I use [] as for now. I could change this to something like: foo(1,2) : (x) { } or foo(1,2) (x) -> { } So the actual question is, what do you think looks best? [...] is somewhat wrist unfriendly. let x = [a,b] { } Ideas?

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  • Why does 12.04 try but fail to hibernate, even after I enabled hibernation?

    - by Roger Davis
    Regarding the below (-----) info from another post, my system will try (as is said below) to hibernate, but it won't get all the way there. Hard drive activity stops, but it does not shut down. If I turn the power off, then back on, it will start, but I have to "restore previous session" in the browser and other open apps don't restart, with the accompanying hassle. So because it tries, will the suggested fix then cause it to work correctly, or is the literal "try" not really what he means?!? PLEASE NOTE - this is a desktop system, not a laptop. Before enabling hibernation, please try to test whether it works correctly by running pm-hibernate in a terminal. The system will try to hibernate. If you are able to start the system again then you are more or less safe to add an override. To do so, start editing sudo nano /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla Fill it with this [Re-enable hibernate by default] Identity=unix-user:* Action=org.freedesktop.upower.hibernate ResultActive=yes Save by pressing Ctrl-O and exit nano by pressing Ctrl-X Restart and hibernation is back!

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  • sudo: unable to resolve host ubuntu-server

    - by Manfred Van de Waarsenburg
    I have a problem with sudo. Every time when I trying to use sudo I got this problem: sudo: unable to resolve host ubuntu-server My /etc/hosts file: 127.0.0.1 localhost 127.0.1.1 ubuntu-server # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes FF02::2 ip6-allrouters /etc/hostname gives: ubuntu-server I think there is some other setting that causes the unable to resole host, but I cannot find these.

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  • Building package from binary files - what's wrong with my control file

    - by Hannes de Jager
    I'm busy trying to build a .deb package from the binaries of my application (non open source) and I'm having trouble getting the correct info to display in the Ubuntu Software Centre (when you click on the .deb file). Please see screenshot below of control file and Software Centre View. It seems like the package name and the package description is swapped. I'm expecting the part in bold to read "attix5pro" and not "Cloud backup agent". Can someone show my my mistake or guide me?

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  • Configure htaccess to show index.php as the default page instead of permissions error

    - by Jan De Laet
    Having a problem with my .htaccess. I have this to secure all my documents: Order Deny,Allow Deny from all Allow from 127.0.0.1 <FilesMatch "\.(htm|html|css|js|php)$"> Order Allow,Deny Allow from all Allow from 127.0.0.1 </FilesMatch> Now everything works fine except that the index page of www.mysite.com doesn't work and gives me the notification: You don't have permission to access / on this server. How can you fix this? If there stands www.example.com/index.php it works but if you surf to www.example.com I get this message.

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