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  • Why Java as a First Language?

    - by dsimcha
    Why is Java so popular as a first language to teach beginners? To me it seems like a terrible choice: It's statically typed. Static typing isn't useful unless you care a lot about either performance or scaling to large projects. It requires tons of boilerplate to get the simplest code up and running. Try explaining "Hello, world" to someone who's never programmed before. It only handles the middle levels of abstraction well and is single-paradigm, thus leaving out a lot of important concepts. You can't program at a very low level (pointers, manual memory management) or a very high level, (metaprogramming, macros) in it. In general, Java's biggest strength (i.e. the reason people use it despite the shortcomings of the language per se) is its libraries and tool support, which is probably the least important attribute for a beginner language. In fact, while useful in the real world these may negatives from a pedagogical perspective as they can discourage learning to write code from scratch.

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  • File system layout for multiple build targets

    - by Yttrill
    I am seeking some ideas for how to build and install software with some parameters. These including target OS, target platform CPU details, debugging variant, etc. Some parts of the install are shared, such as documentation and many platform independent files, others are not, such as 64 and 32 bit libraries when these are separated and not together in a multi-arch library. On big networked platforms one often has multiple computers sharing some large server space, so there is actually cause to have even Windows and Unix binaries on the same disk. My product has already fixed an install philosophy of $INSTALL_ROOT/genericname/version/ so that multiple versions can coexist. The question is: how to manage the layout of all the other stuff?

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  • My own personal use of Oracle Linux

    - by wcoekaer
    It always is easier to explain something with examples... Many people still don't seem to understand some of the convenient things around using Oracle Linux and since I personally (surprise!) use it at home, let me give you an idea. I have quite a few servers at home and I also have 2 hosted servers with a hosted provider. The servers at home I use mostly to play with random Linux related things, or with Oracle VM or just try out various new Oracle products to learn more. I like the technology, it's like a hobby really. To be able to have a good installation experience and use an officially certified Linux distribution and not waste time trying to find the right libraries, I, of course, use Oracle Linux. Now, at least I can get a copy of Oracle Linux for free (even if I was not working for Oracle) and I can/could use that on as many servers at home (or at my company if I worked elsewhere) for testing, development and production. I just go to http://edelivery.oracle.com/linux and download the version(s) I want and off I go. Now, I also have the right (and not because I am an employee) to take those images and put them on my own server and give them to someone else, I in fact, just recently set up my own mirror on my own hosted server. I don't have to remove oracle-logos, I don't have to rebuild the ISO images, I don't have to recompile anything, I can just put the whole binary distribution on my own server without contract. Perfectly free to do so. Of course the source code of all of this is there, I have a copy of the UEK code at home, just cloned from https://oss.oracle.com/git/?p=linux-2.6-unbreakable.git. And as you can see, the entire changelog, checkins, merges from Linus's tree, complete overview of everything that got changed from kernel to kernel, from patch to patch, errata to errata. No obfuscating, no tar balls and spending time with diff, or go read bug reports to find out what changed (seems silly to me). Some of my servers are on the external network and I need to be current with security errata, but guess what, no problem, my servers are hooked up to http://public-yum.oracle.com which is open, free, and completely up to date, in a consistent, reliable way with any errata, security or bugfix. So I have nothing to worry about. Also, not because I am an employee. Anyone can. And, with this, I also can, and have, set up my own mirror site that hosts these RPMs. both binary and source rpms. Because I am free to get them and distribute them. I am quite capable of supporting my servers on my own, so I don't need to rely on the support organization so I don't need to have a support subscription :-). So I don't need to pay. Neither would you, at least not with Oracle Linux. Another cool thing. The hosted servers came (unfortunately) with Centos installed. While Centos works just fine as is, I tend to prefer to be current with my security errata(reliably) and I prefer to just maintain one yum repository instead of 2, I converted them over to Oracle Linux as well (in place) so they happily receive and use the exact same RPMs. Since Oracle Linux is exactly the same from a user/application point of view as RHEL, including files like /etc/redhat-release and no changes from .el. to .centos. I know I have nothing to worry about installing one of the RHEL applications. So, OL everywhere makes my life a lot easier and why not... Next! Since I run Oracle VM and I have -tons- of VM's on my machines, in some cases on my big WOPR box I have 15-20 VMs running. Well, no problem, OL is free and I don't have to worry about counting the number of VMs, whether it's 1, or 4, or more than 10 ... like some other alternatives started doing... and finally :) I like to try out new stuff, not 3 year old stuff. So with UEK2 as part of OL6 (and 6.3 in particular) I can play with a 3.0.x based kernel and it just installs and runs perfectly clean with OL6, so quite current stuff in an environment that I know works, no need to toy around with an unsupported pre-alpha upstream distribution with libraries and versions that are not compatible with production software (I have nothing against ubuntu or fedora or opensuse... just not what I can rely on or use for what I need, and I don't need a desktop). pretty compelling. I say... and again, it doesn't matter that I work for Oracle, if I was working elsewhere, or not at all, all of the above would still apply. Student, teacher, developer, whatever. contrast this with $349 for 2 sockets and oneguest and selfsupport per year to even just get the software bits.

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  • Play videos with libwebkit in Ubuntu 11.10 server

    - by Luis Fagundes
    I'm using libwebkit (with python-webkit) to render a page that plays a video. This application works fine in a Ubuntu 11.04 Desktop, Nvidia card and lots of libraries and software installed, but in a fresh Ubuntu 11.10 Server with intel 82945G/GZ card the video does not play. I guess either some codec package is missing or it's a driver problem. What could be missing for this to play? I'm trying with this video: http://video.eustasy.co.uk/480/ EDIT: doesn't look like a driver problem. With chromium I can play the video, but with libwebkit + python-webkit the video just shows the first frame and doesn't play. Any hints on what package could be missing? SOLVED: apparently it had to do with lack of audio. While chrome would play the video with no sound, libwebkit wouldn't start video. Adding user to audio and video groups solved the problem.

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  • JSIL - a Dot Net to JavaScript translator

    - by TATWORTH
    JSI is described at http://jsil.org/ as:"JSIL is a compiler that transforms .NET applications and libraries from their native executable format - CIL bytecode - into standards-compliant, cross-browser JavaScript. You can take this JavaScript and run it in a web browser or any other modern JavaScript runtime. Unlike other cross-compiler tools targeting JavaScript, JSIL produces readable, easy-to-debug JavaScript that resembles the code a developer might write by hand, while still maintaining the behavior and structure of the original .NET code. Because JSIL transforms bytecode, it can support most .NET-based languages - C# to JavaScript and VB.NET to JavaScript work right out of the box."

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  • Can Ubuntu be installed in a subdirectory of another Linux variant?

    - by Reid
    I have access to (but not root on) a compute server which is running a Linux distribution that is a few years old. I'd much prefer to use a current Debian-like flavor. Thus, I'm wondering if it is possible to install Ubuntu (or stock Debian) in one of my directories, and use the Ubuntu programs and libraries in preference to what comes with the server. I would need to access arbitrary parts of the server's filesystem, not just the parts under the Ubuntu install. I log in by SSH, so there's no desktop environment needed. But, I would like to be able to use X programs.

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  • HIB Games (Aquaria & Penumbra) cannot find libGL.so.1 even though it exists

    - by aberration
    I'm try to play some Humble Indie Bundle (HIB) games, but I'm getting errors with Aquaria and Penumbra: Overture that are related to the libGL.so.1 file. Aquaria gives this error on launch: Message: SDL_GL_LoadLibrary Error: Failed loading libGL.so.1 And Penumbra: Overture gives this error on launch: ./penumbra.bin: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory I know that the file libGL.so.1 does exist (in /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1). From past errors like this, I'm guessing that you need to symlink the library to another directory, but I can't figure out which one.

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  • Does a code inherit GNU GPL if it just link to GPL librrary?

    - by user14284
    Sorry for bad English. Suppose there is a library xxx under GNU GPL, that provide a function yyy. Suppose my code links to the library and use this function. Does my code inherit GPL license? IANAL, but my thoughts are conflicting: On other hand, my code is derivative from the library, so it should inherit GPL. On other hand, my code just use link to the xxx. Maybe there are other libraries, that has the same interface (particularly, they provide yyy function with same functionality, but different implementation). My code may link to any. My code really doesn't directly derived from xxx, it just use its interface. So, my code shouldn't inherit GPL. I'm confused. ADDED. The question is absolutely abstract. I don't mean any concrete GPL library.

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  • Depending on another open source library: copy/paste code or include

    - by user5794
    I'm working on a large class and started implementing new features that need graphics. I started writing the graphics functions myself, but I know that open source libraries exist that can provide me with this functionality without me having to write it myself. The problem is that I prefer the class to be self-sufficient and not dependent on any other library. If I don't write it myself, I would have to ask the user to make sure a graphics library is already installed (less user-friendly). If I write it myself, I do a lot more work than I have to. I could also copy/paste some of the relevant code into my own class, but not sure about the disadvantages of doing this (it's an open source library that matches my license, so I'm not concerned with legality, just programming-wise if there are disadvantages). So what should I do: copy paste code from the external library write the code myself so it's truly self-sufficient ask the user to download and install another library

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  • Converting a WIndows Store App to Android

    - by pm_2
    I cross posted this from SO I'm very new to Xamarin. I have a few published Windows Store apps and want to convert them to Android. I'm attempting to use Xamarin for this. I'm just using the free version of Xamarin. Here's where I am so far: I am trying two apps - one was build with Monogame and one is just build on the WinRT framework. I have managed to get them both into Xamarin studio, basically by hacking the csproj files. I'm getting build errors because it's missing references. There does appear to be some equivalent Mono / .Net4 libraries, but things like Microsoft.Xna.Framework seem to be missing. So, my question is: am I going about this the right way and, if so, am I missing a step ("convert dependencies" or something)? If I'm not going about this the right way then how should I be doing this (I found very few online resources on this subject)?

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  • When it's more productive to build your own framework than using an existing one?

    - by Pierre 303
    I would like to know why you decided to build your own framework in your company. By framework, I don't mean few libraries you use often. I mean a specific way of building applications on top of it, with base classes, convention, etc. So why did you built your own framework? How could you justify that to the person that employs you. Have you measure the positive and negative impact of it? Regarding your experiences, did you notice that in some case a company framework produced real benefits, or on the other hand, increased costs of development (learning curve, debugging, maintenance, ...)?

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  • How to design a game engine in an object-oriented language?

    - by chuzzum
    Whenever I try and write a game in any object-oriented language, the first problem I always face (after thinking about what kind of game to write) is how to design the engine. Even if I'm using existing libraries or frameworks like SDL, I still find myself having to make certain decisions for every game, like whether to use a state machine to manage menus, what kind of class to use for resource loading, etc. What is a good design and how would it be implemented? What are some tradeoffs that have to be made and their pros/cons?

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  • Dartisans ep 14 - Dart Community Demos

    Dartisans ep 14 - Dart Community Demos The #dartlang community has been busy! You'll meet some members of the Dart community and see demos of their latest projects. Also, learn how an open-source contributor gained committer status for Dart! As always, ask and vote for questions for Dart engineers and community members. Meet +Kevin Moore, +Alexander Aprelev, and +John McCutchan show off their libraries and projects. You might just see WebGL, dart2js, and BOT in action. Ask questions here: developers.google.com Learn more about Dart at www.dartlang.org From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • What options should I consider for a modern Web/Mobile development stack? [on hold]

    - by jimmy_terra
    I'm a long time server side dev who has been tasked with building a bleeding edge web UI (go figure), so apologies for the very broad nature of the question. What are the best modern libraries, tools, languages and patterns for building a dynamic web application that will run seamlessly on mobiles also? My requirements are that it must be dynamic (push updates), support automated testing, and should allow 'componentization' (a team of devs will be working on this). What should I check out and why? I will start off with some of the things I'm looking at already: Front-end HTML5 CSS3 JavaScript AngularJs Testing Karma Testem Jasmine Patterns Single Page Applications

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  • Another Linq to SQL product, Enzo Multitenant Framework

    - by Ed Gnatiuk
    An open source library and full product have been developed for transparently splitting large tables across several databases for performance, similar to database table partitioning.  It is all handled along with the Linq to SQL framework, and looks pretty slick, I will be reviewing the product shortly.  It looks mostly transparent to the developer!  There are other capabilites worth a look.  This looks like it works for azure as well. Here are some links:  http://enzosqlshard.codeplex.com/   http://enzosqlbaseline.com    https://scale.bluesyntax.net   I will be reviewing this and other Linq to SQL libraries soon.

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  • Largest successful JavaScript project? [closed]

    - by 80x24 console
    A common theme in the GWT community is "I wouldn't want to build a project of THAT size using a pure JavaScript library!" What is the largest project that you have successfully delivered with frontend functionality written in JavaScript? (not Java or GWT) Please provide at least a hand-wavy SLOC estimate of the unique JS code (not including libraries, frameworks, toolkits, test code, generated code, server-side processing such as PHP, etc.) that was in the finished product. Note to GWT advocates: Please read the question carefully before answering. I've heard plenty of stories about JS failures and GWT successes, but I'd like to hear some quantified JS successes. Note to mods: This is primarily a business-of-software question, not a tools question. It factors into a real-world business decision.

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  • Where to start, to develop an online Backgammon game?

    - by Matt V.
    I would like to develop a backgammon game to play against other players online, as a way of learning more Javascript/jQuery and a little game development. I'm a web developer and most of my experience is in PHP. I have minimal Javascript experience and no game development experience. Where should I start? Are there any particular books, tutorials, libraries, or frameworks that would help give me a jumpstart? As a beginner, am I better of using the DOM or Canvas?

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  • What library should I use for 2D Geometry? [closed]

    - by Luka
    I've been working on a 2D game in java, but found that java just didn't cut it for me and had forced me to a lot of bad design choices, so I've decided to port all my work to c++. The main reason I've decided change to c++ is that i had reached a point where i had 3 geometry libraries (the native, one from the game engine and one to handle "complex" polygons), none of witch worked very well together and i couldn't keep track of them. I'm new to c++, but i know all the basics. My question is, what would be a good geometry library to use, ideally it should be able to handle integer and decimal data types, have point, line, and polygon classes witch are able to check for intersection and contains. Thanks in advance, Luka

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  • When is using stdio preferable to fstream?

    - by Karl Bielefeldt
    I work on a well-established, embedded C++ code base. We have been using a proprietary API to our filesystem. For better integration with third-party C libraries, we are currently in the process of implementing most of stdio.h and fcntl.h. I made what I thought was a non-controversial proposal that we should also implement the fstream class and encourage new C++ code to use it instead of the new (to our code base) C-style API. We already have the stdout parts of iostream available, although it is not widely used. Given a choice between using stdio and fstream, what are good reasons to choose stdio for embedded software development in C++?

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  • JavaOne 2012 demo of Java SE Embedded on Raspberry Pi

    - by hinkmond
    Here's the Inquirer's article about our Java SE Embedded demos at JavaOne 2012 this year. Simon Ritter had a fun presentation showing the cool demo on the Raspberry Pi at his talk. See: Demo Java SE Embedded on Raspberry Pi Here's a quote: Oracle demonstrated Java SE for embedded devices running on the Raspberry Pi bare bones computer at the Java One show on Wednesday, with the aim of encouraging developers to try it out for themselves to create reference libraries for the target school children audience. I had the presentation after Simon and saw the size crowd he had. They were laughing and clapping at the demo and having a good ol' time. Good to see the interest in Java SE Embedded, even if it is for a "toy" device like the Raspberry Pi. Hinkmond

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  • TypeScript for Visual Studio 2012

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/06/21/typescript-for-visual-studio-2012.aspxAt http://www.microsoft.com/en-us/download/details.aspx?id=34790, Microsoft provide a free download of TypeScript for Visual Studio 2012. The documentation site is at http://www.typescriptlang.org/It is described as TypeScript is a language for application-scale JavaScript development.TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.Any browser. Any host. Any OS. Open Source.TypeScript starts from the syntax and semantics that millions of JavaScript developers know today.TypeScript compiles to clean, simple JavaScript code which runs on any browser, in Node.js, or in any other ES3-compatible environment.With TypeScript, you can use existing JavaScript code, incorporate popular JavaScript libraries, and be called from other JavaScript code.These features are available at development time for high-confidence application development, but are compiled into simple JavaScript.If you have written JavaScript, you will know why I welcome the release of version 0.9 of TypeScript as TypeScript should be a lot less frustrating to write. I suggest you go to https://typescript.codeplex.com/ and follow this very promising project.

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  • Microsoft Translator client library for Silverlight

    A while back immediately after MIX10 I started messing with Microsoft Translator APIs for Silverlight applications. I also got some people asking about Windows Phone 7 stuff and messed around with that a bit. Heres some post for reference: Make your Silverlight applications speak to you Using XNA libraries in Silverlight for Windows Phone 7 (with Translator as an example) In talking with the Translator team following MIX (where they announced they were working on a Silverlight class library...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Dependency problem while missing package is already installed

    - by hakermania
    I am trying to install a program but I am getting a dependency error. The error clearly points out: Dependency is not satisfiable: libc6-amd64 (>= 2.14) I went on to investigate and I found out that I have 2.19 version installed, actually: alex@MaD-pc:~$ apt-cache policy libc6-amd64 libc6-amd64:i386: Installed: 2.19-0ubuntu6 Candidate: 2.19-0ubuntu6 Version table: *** 2.19-0ubuntu6 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages 100 /var/lib/dpkg/status Why am I getting this error if I already have this package? I also should probably mention that the system is 100% up to date. I run the updates and upgrades, restarted the system and then tried to install the package again with the same error popping up. Edit 1: I am using amd64 but I have installed some 32-bit libraries required by some program installed via wine if I recall correctly.

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  • How to get espeak working?

    - by wisemonkey
    I'm trying read it loud feature of acrobat, so need a text synthesizer, I've installed espeak and libgnome-speech libraries (it didn't work for acrobat right out of the box) so when I started espeak-gui through command line it gave me segmentation fault next I tried only espeak and here is output: ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side ALSA lib audio/pcm_bluetooth.c:1613:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5) ALSA lib audio/pcm_bluetooth.c:1613:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5) ALSA lib audio/pcm_bluetooth.c:1613:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5) ALSA lib audio/pcm_bluetooth.c:1613:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5) ALSA lib pcm_dmix.c:957:(snd_pcm_dmix_open) The dmix plugin supports only playback stream Cannot connect to server socket err = No such file or directory Cannot connect to server socket jack server is not running or cannot be started Any ideas? or any alternative solutions for read it loud? Thanks

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  • Does it make sense to use jQuery in modern-webkit-only web applications?

    - by futlib
    I'm lately working on a few mobile web apps for Android (2.3+) and iOS (4+). Their browsers support most of ECMAScript5, which is very powerful, and I wanted to use language features where possible, resorting to jQuery only when I had to. Turns out the only thing I use jQuery for is to have a shorter alternative for document.querySelectorAll. Might as well get rid of it. If I only have to support modern WebKit browsers, is it a good idea to get rid of jQuery (and other general-purpose libraries)? They are a layer of indirection, after all. (The apps don't have to make AJAX calls so far, I guess that's one thing that's going to get ugly. But is it worth keeping jQuery just for that?)

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