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• Default vs Impl when implementing interfaces in Java

  - by Gary Rowe

  After reading Should package names be singular or plural? it occurred to me that I've never seen a proper debate covering one of my pet peeves: naming implementations of interfaces. Let's assume that you have a interface Order that is intended to be implemented in a variety of ways but there is only the initial implementation when the project is first created. Do you go for DefaultOrder or OrderImpl or some other variant to avoid the false dichotomy? And what do you do when more implementations come along? And most important... why?

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• Coherence Based WebLogic Server Session Management

  - by [email protected]

  Specifications Supported Configurations WebLogic Server 10.3.2( or 10.3.1 ) Coherence 3.5.2/463 If you use other verion above, then please check the following matrix:   WebLogic Server 9.2 MP1 Weblogic Server 10.3 WebLogic Smart Update Patch ID: AJQB Patch ID: 6W2W Minimum Coherence Release Level/MetaLink Patch ID 3.4.2 Patch 2-Patch ID:8429415 3.4.2 Patch6-Patch ID:11399293 Environment Variables %COHERENCE_HOME%: coherence installation directory %DOMAIN_HOME%: weblogic domain foler. Instructions We Will create to weblogic domains: domain_a, domain_b. To configure those domains with coherence-based session management . Then the changings of session variable value in one domain will propagate to another domain. Main Steps WebLogic Server create domain_a The process is ignored copy %COHERENCE_HOME%\lib\coherence.jar to %DOMAIN_HOME%\lib startup domain deploy %COHERENCE_HOME%\lib\coherence-web-spi.war as a Shared Library repeat step 1~4 at domain_b Coherence duplicate %COHERENCE_HOME%\bin\cache-server.cmd at the same folder and rename it to web-cache-server.cmd modify web-cache-server.cmd java -server -Xms512m -Xmx512m -cp %coherence_home%/lib/coherence.jar;%coherence_home%/lib/coherence-web-spi.war -Dtangosol.coherence.management.remote=true -Dtangosol.coherence.cacheconfig=WEB-INF/classes/session-cache-config.xml -Dtangosol.coherence.session.localstorage=true com.tangosol.net.DefaultCacheServer startup web-cache-server.cmd Testing develop a web app  with OEPE or JDeveloper and implment functions: changing, viewing, listing  session variables. ( or download sample codes here ) modify weblogic.xml with following content: <?xml version="1.0" encoding="UTF-8"?> <wls:weblogic-web-app xmlns:wls=http://xmlns.oracle.com/weblogic/weblogic-web-app xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://xmlns.oracle.com/weblogic/weblogic-web-app http://xmlns.oracle.com/weblogic/weblogic-web-app/1.0/weblogic-web-app.xsd"> <wls:weblogic-version>10.3.2</wls:weblogic-version> <wls:context-root>CoherenceWeb</wls:context-root> <wls:library-ref> <wls:library-name>coherence-web-spi</wls:library-name> <wls:specification-version>1.0.0.0</wls:specification-version> <wls:exact-match>true</wls:exact-match> </wls:library-ref> </wls:weblogic-web-app> deploy the web app to domain_a and domain_b change session varaible vlaue at domain_a and check whethe if changed at domain_b References Using Oracle Coherence*Web 3.4.2 with Oracle WebLogic Server 10gR3 Oracle Coherence*Web 3.4.2 with Oracle WebLogic Server 10gR3

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• PonyEdit: It’s really fast

  - by Gary Pendergast

  Over the past few months, a friend and I have been hard at work on a new breed of text editor that we call PonyEdit. If you’ve ever found yourself cursing over the lag of working on remote cloud servers, this is the editor for you.It’s not just another SFTP editor…Reading and writing files over SFTP is nothing new; dozens of text editors can do it. But it’s always slow, clunky and feels like the feature was bolted on as an afterthought. You’ll find yourself using separate shortcuts to open files locally vs remotely, and dealing with sometimes painful save times with every edit, no matter how minor.PonyEdit gets rid of this terribly slow method of working by connecting over SSH, and using edit streaming to push changes to the server in the background as-you-type.Head on over to PonyEdit.com to download a free trial, and let me know what you think! Oh, and…Stand by to have your mind blown.

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• Does programming knowledge have a half-life?

  - by Gary Rowe

  In answering this question, I asserted that programming knowledge has a half-life of about 18 months. In physics, we have radioactive decay which is the process by which a radioactive element transforms into something less energetic. The half-life is the measure of how long it takes for this process to result in only half of the material to remain. A parallel concept might be that over time our programming knowledge ceases to be the current idiom and eventually becomes irrelevant. Noting that a half-life is asymptotic (so some knowledge will always be relevant), what are your thoughts on this? Is 18 months a good estimate? Is it even the case? Does it apply to design patterns, but over a longer period? What are the inherent advantages/disadvantages of this half-life? Update Just found this question which covers the material fairly well: "Half of everything you know will be obsolete in 18-24 months" = ( True, or False? )

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• How should I start with Lisp?

  - by Gary Rowe

  I've been programming for years now, working my way through various iterations of Blub (BASIC, Assembler, C, C++, Visual Basic, Java, Ruby in no particular order of "Blub-ness") and I'd like to learn Lisp. However, I have a lot of intertia what with limited time (family, full time job etc) and a comfortable happiness with my current Blub (Java). So my question is this, given that I'm someone who would really like to learn Lisp, what would be the initial steps to get a good result that demonstrates the superiority of Lisp in web development? Maybe I'm missing the point, but that's how I would initially see the application of my Lisp knowledge. I'm thinking "use dialect A, use IDE B, follow instructions on page C, question your sanity after monads using counsellor D". I'd just like to know what people here consider to be an optimal set of values for A, B, C and perhaps D. Also some discussion on the relative merit of learning such a powerful language as opposed to, say, becoming a Rails expert. Just to add some more detail, I'll be developing on MacOS (or a Linux VM) - no Windows based approaches will be necessary, thanks. Notes for those just browsing by I'm going to keep this question open for a while so that I can offer feedback on the suggestions after I've been able to explore them. If you happen to be browsing by and feel you have something to add, please do. I would really welcome your feedback. Interesting links Assuming you're coming at Lisp from a Java background, this set of links will get you started quickly. Using Intellij's La Clojure plugin to integrate Lisp (videocast) Lisp for the Web Online version of Practical Common Lisp (c/o Frank Shearar) Land of Lisp a (+ (+ very quirky) game based) way in but makes it all so straightforward

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• Chainload boot of Ubuntu installed on 32GB SD card from legacy Grub boot on USB

  - by Gary Darsey

  I have Ubuntu installed on a 32 GB SD card (in the Storage Expansion slot on an Acer Aspire One) with Grub2 installed in the same partition. I boot into legacy Grub on a USB drive and would like to boot by chainloading Grub2 from Grub (kernel/initrd or symlink booting would also be fine), but I haven't figured out how to do this from legacy Grub CLI. Output from blkid for this partition is /dev/mmcblk0p1: LABEL="Ubuntu" UUID="7ceb9fa7-238c-4c5d-bb8e-2c655652ddec" TYPE='ext4" / fdisk -lu information Boot indicator ID 83. Related entries in grub.cfg: search --no-floppy --fs-uuid --set-root 7ceb9fa7-238c-4c5d-bb8e-2c655652ddec linux /boot/vmlinuz-3.5.0-17-generic root=UUID=7ceb9fa7-238c-4c5d-bb8e-2c655652ddec... initrd /boot/initrd.img-3.5.0-17-generic I can't seem to replicate this in legacy Grub. Is there any way get Grub2 to chainload? How do I set root with UUID in legacy Grub? I prefer to boot from USB. Would Grub2 on USB (copying the grub.cfg generated during installation) be an option?

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• How should I start with Lisp?

  - by Gary Rowe

  I've been programming for years now, working my way through various iterations of Blub (BASIC, Assembler, C, C++, Visual Basic, Java, Ruby in no particular order of "Blub-ness") and I'd like to learn Lisp. However, I have a lot of intertia what with limited time (family, full time job etc) and a comfortable happiness with my current Blub (Java). So my question is this, given that I'm someone who would really like to learn Lisp, what would be the initial steps to get a good result that demonstrates the superiority of Lisp in web development? Maybe I'm missing the point, but that's how I would initially see the application of my Lisp knowledge. I'm thinking "use dialect A, use IDE B, follow instructions on page C, question your sanity after monads using counsellor D". I'd just like to know what people here consider to be an optimal set of values for A, B, C and perhaps D. Also some discussion on the relative merit of learning such a powerful language as opposed to, say, becoming a Rails expert. Just to add some more detail, I'll be developing on MacOS (or a Linux VM) - no Windows based approaches will be necessary, thanks. Notes for those just browsing by I'm going to keep this question open for a while so that I can offer feedback on the suggestions after I've been able to explore them. If you happen to be browsing by and feel you have something to add, please do. I would really welcome your feedback. Interesting links Assuming you're coming at Lisp from a Java background, this set of links will get you started quickly. Using Intellij's La Clojure plugin to integrate Lisp (videocast) Lisp for the Web Online version of Practical Common Lisp (c/o Frank Shearar) Land of Lisp a (+ (+ very quirky) game based) way in but makes it all so straightforward

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• Preventing Users From Accessing wp-admin

  - by Gary Pendergast

  If you have a WordPress site that you allow people to sign up for, you often don’t want them to be able to access wp-admin. It’s not that there are any security issues, you just want to ensure that your users are accessing your site in a predictable manner.To block non-admin users from getting into wp-admin, you just need to add the following code to your functions.php, or somewhere similar:add_action( 'init', 'blockusers_init' );   function blockusers_init() { if ( is_admin() && ! current_user_can( 'administrator' ) ) { wp_redirect( home_url() ); exit; } }Ta-da! Now, only administrator users can access wp-admin, everyone else will be re-directed to the homepage.

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• Diabetic trying to use Ubuntu with Medtronic Carelink insulin pump support USB device

  - by Gary C.

  I am taking a wild shot here: I am a type 1 diabetic who is going on the Insulin pump. Unfortunately, the Medtronic Carelink USB device that uploads data from the pump online only has windows drivers. Has anybody managed to get this working under Ubuntu using Wine or by any other method: lsusb yields: Bus 001 Device 014: ID 0a21:8001 Medtronic Physio Control Corp. MMT-7305WW [Medtronic Minimed CareLink] I really don't want to buy a windows machine just for this, but it's probably one in a million that somebody else has managed to make this work under Linux.

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• Linux Learning curve for a 'Lifetime' windows user [closed]

  - by gary

  I am using windows for almost 8-10 years and have never worked on linux. Mostly i used to work in VB, VC++ MFC and little bit of .NET(C# and VB) so i didn't bother about Linux. But now when i got an opportunity to work with linux i dont want to miss it, here are my questions : Where can i find useful resources for Linux newbies? Which books/Tutorials will you suggest to start? Which distro shall i use? What was your experience while moving from Windows to Linux?

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• What are the design decisions involved in choosing how to expose a Java web application?

  - by Gary Rowe

  There are many ways to expose a Java web application to the consumer: application container (JBoss etc), servlet container (Tomcat etc), OSGi (Knopflerfish etc), self-executable WAR (Winstone etc) and so on. Are there any clear considerations where one approach should be favoured over another? As an example, could a collection of self-executable WARs running as raw Unix processes outperform the same applications deployed within Tomcat taking into account administration and scalability concerns?

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• Alt Tab with xdotool and xkeybind

  - by Gary

  I'm trying to map alt tab behavior to a mouse button using xdotool in my .xbindkeysrc. What I want to do is map something like "xdotools keydown alt key Tab" release b:7 but by doing this the alt key gets stuck, and it prevents my other mappings from working until I press the alt key on the keyboard. Is there a way to do this without having to press the alt key to get things unstuck? Without keydown it just switches back and forth between two windows, with keydown it behaves like I want (displaying the alt-tab switcher) but the alt key is stuck. Is there a way to unstick the key after using the alt tab switcher using xdotools?

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• When should I use AtomPub?

  - by Gary Rowe

  I have been conducting some research into RESTful web service design and I've reached what I think is a key decision point so I thought I'd offer it up to the community to get some advice. In keeping with the principles of a RESTful architecture I want to present a discoverable API, so I will be supporting the various HTTP verbs as fully as possible. My difficulty comes with the choice of representation of those resources. You see, it would be easy for me to come up with my own API that covers how search results are to be presented and how links to other resources are provided, but this would be unique to my application. I've read about the Atom Publishing Protocol (RFC 5023), and how OData promotes its use, but it seems to add an extra level of abstraction over what is (currently) a rather simple API. So my question is, when should a developer select AtomPub as their choice of representation - if at all? And if not, what is the current recommended approach?

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• How to replace nss with new version 11.10 64bit

  - by Gary S

  I need a specific version of NSS 3.12.4. I have a simple java crypto (Sun-pkcs11) test and it works with the default nss setup from Ubuntu 11. (pointing to /usr/lib/x86_64-linux-gnu where all the libnss*.so files live) But when I point specifically to the custom 3.12.4 lib folder, it doesn't work. The only way to get it to work is to set the LD_LIBRARY_PATH to point to the new folder. So what is the preferred way to 'swap in' a new nss module? Do I need to overwrite any matching .so files in /usr/lib and /usr/lib/x86_64-linux-gnu? Should I use an install command? Point is, I don't think I should have to use LD_LIBRARY_PATH.

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• MMORPG game balancing

  - by Gary Paluk

  I've seen a couple of examples of some game balancing techniques in books yet they are not comprehensive and not particularly aimed at MMORPGs but I'm looking for practical examples of game balancing techniques for MMORPGs. I am interested to know if anyone has documented the techniques used in popular games with proven success in this area. Ideally, any resource would cover most common types of stats and include layman mathematical models or techniques used to balance game mechanics found in advanced MMORPGs (I know it's a cliché, but WoW style) Any help would be great!

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• WCF web service with Neural Network

  - by Gary Frank

  I am developing a web service that performs object recognition. It will be available for testing as soon as enough code has been developed, and then officially when it is finished. It is based on a radically new type of artificial neural network that I designed. Its goal is to recognize any type of object within an image. Besides the WCF web service, the project will also create a website to test and demonstrate the web service. Here is a link with more information. http://www.indiegogo.com/VOR

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• Installing Ubuntu 12.04 on a single GPT SSD which contains Windows 7

  - by Gary

  I recently bought a brand new 64 bit PC with a (ASUS) motherboard that supports UEFI and a GPT formatted 240Gb SSD, which contains Windows 7 in the first of 3 (80Gb) partitions. When the system arrived, it booted into Windows 7 like a dream, with no problems. I did not originally want Windows, but the manufacturer does not work with Linux (of any flavour), so I thought I would install Ubuntu into the second partition and dual boot. I downloaded the 12.04 64bit version and proceeded to install. Having selected to 'install', the screen became corrupted, with multicoloured garbage across the middle third of the screen !! So, I rebooted and --- MISSING OPERATING SYSTEM !!! The only way I can now get into Windows is via Super Grub2. First question - what went wrong ? 2nd - Will Ubuntu install on a GPT disk partition ? 3rd - Will it install alongside Windows 7 without screwing the boot mechanism ? 4th - How do I do it ? I have scoured the internet looking for appropriate answers and found NONE ! Please help.......

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• Possible automated Bing Ads fraud?

  - by Gary Joynes

  I run a website that generates life insurance leads. The site is very simple a) there is a form for capturing the user's details, life insurance requirements etc b) A quote comparison feature We drive traffic to our site using conventional Google Adwords and Bing Ads campaigns. Since the 6th January we have received 30-40 dodgy leads which have the following in common: All created between 2 and 8 AM Phone number always in the format "123 1234 1234' Name, Date Of Birth, Policy details, Address all seem valid and are unique across the leads Email addresses from "disposable" email accounts including dodgit.com, mailinator.com, trashymail.com, pookmail.com Some leads come from the customer form, some via the quote comparison feature All come from different IP addresses We get the keyword information passed through from the URLs All look to be coming from Bing Ads All come from Internet Explorer v7 and v8 The consistency of the data and the random IP addresses seem to suggest an automated approach but I'm not sure of the intent. We can handle identifying these leads within our database but is there anyway of stopping this at the Ad level i.e. before the click through.

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• What is your preferred font for working with code and data?

  - by Gary

  The features I would look for in a 'programmers' font are Monospaced (maybe less important for code, but more important for data) Distinguishable characters. Often I (uppercase i), 1 (one) and l (lower-case L) can be confusing, as can O (upper-case o) and 0 (zero). I'd be interested other character issues, especially in accented or extended character sets. Free Windows / Linux / OSX Legible on screen and printouts at smaller sizes I've community wiki'd this. I'm really looking for a list of fonts that qualify. From that list, people can pick what looks good to them.

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• pointer jumping about Lubuntu 12.04

  - by Gary Kirkpatrick

  Using 12.04 on a Samsung NC110. If I disable Touchpad, the cursor does not jump about while typing. This is very very annoying. Tried this tutorial, but this does not help. The problem occurs even when my fingers are well away from the Touchpad. I wonder if another key or key combination causes this problem? I sure could use some help on this. I have had this problem with various versions of Ubuntu and now Lubuntu.

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• How to Organize Subdirectories? [closed]

  - by Gary Iverson

  I am working on my first major (several hundred pages) website design and development project. I want to create subdirectories for each of the website's categories, which in turn have their own subdirectories for easy user navigation. Example: website.com/directory. I am aware that by placing an index.html file within each directory, the browser automatically detects and navigates to that page, but that seems like a messy solution (having multiple index.html files, albeit in distinct folders), and I cannot imagine everyone does that. So my question is...how do you properly organize and use subdirectories?

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• Wifi not working after upgrading from 12.04 to 13.10

  - by Gary

  I went through loads of posts looking for an answer to my WiFi problems but can't seem to fix it. I had Ubuntu 12.04 installed and WiFi worked fine with no issues whatsoever but then I upgraded to 13.10 it has stopped working. It shows the available networks but I can't connect to any of them it just does that animation thing then stops working. Update Heres the link to pastebin: http://pastebin.com/GyMMEYhv And heres what wifi card i have and driver lspci: 01:00.2 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0a) Subsystem: Hewlett-Packard Company Device [103c:18de] Kernel driver in use: r8169 02:00.0 Network controller [0280]: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe [1814:3290] Subsystem: Hewlett-Packard Company Device [103c:18ec] Kernel driver in use: rt2800pci

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• How to read data from a large number of files in a folder? [closed]

  - by Gary Dhillon

  I seem to be having some trouble figuring out a solution for a problem. See the thing is, my code is supposed to read a lot of data from a bunch of files. I've been thinking of two different approaches: 1) the first one seems simpler, I ask the user if they would like to examine the next file or just quit out of the program.( I believe this is simpler and would take less time to run through.) 2)It reads through all the files and outputs the results for each of them, and then a shared result for all of them.( I think this would be better for what I've been asked to do and it saves the user some hassle.) If anyone can tell me how to code either of these in C++, I would be very grateful. Here is a sample of the file: 0 -- 19 weight 0 -- 20 weight I use this to determine density and possibly ignore the weights which is a number.

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• How can I access old KMail emails after upgrading to Ubuntu 11.10?

  - by Gary Kleppe

  I initially installed Ubuntu 11.04 and used KMail for my email. All well and good. Then I upgraded to Ubuntu 11.10. Presumably an upgrade of KMail took place as part of this. Now KMail won't even run; when I try, it tells me "Failed to fetch the resource collection" and crashes. I don't mind switching to another email client, but I'd very much like to be able to recover all of the emails I have stored in KMail. Any suggestions on how to do this? Thanks for any help anyone can provide.

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• Updated Business Activity Monitoring (BAM) Class

  - by Gary Barg

  We have just completed an extensive upgrade to the Business Activity Monitoring course, bringing it up to PS5 level and doing some major rework of content and topic flow. This should be a GREAT course for anyone needing to learn to use BAM effectively to analyze their SOA data. Details of the Course This course explains how to use Oracle BAM to monitor enterprise business activities across an enterprise in real time. You can measure your key performance indicators (KPIs), determine whether you are meeting service-level agreements (SLAs), and take corrective action in real time. Learn To: Create dashboards and alerts using a business-friendly, wizard-based design environment Monitor BPM and BPEL processes Configure drilling, driving, and time-based filtering Create alerts Build applications with a dynamic user interface Manage BAM users and roles In addition to learning Oracle BAM architecture, you learn how to perform administrative tasks related to Oracle BAM. You create and work with the different types of message sources that send data into Oracle BAM. You build interactive, real-time, actionable dashboards, and you configure alerts on abnormal conditions. You learn how to monitor both BPEL and BPM composite applications with Oracle BAM. Lastly, you create and use Oracle BAM data control to build applications with a dynamic user interface that changes based on real-time business events. Registration The Oracle University course page with more course details and registration information, is here. The next scheduled class: Date: 5-Dec-2012 Duration: 3 days Hours: 9:00 AM – 5:00 PM CT Location: Chicago, IL Class ID: 3325708

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