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• Best exception handling practices or recommendations?

  - by user828584

  I think the two main problems with my programs are my code structure/organization and my error handling. I'm reading Code Complete 2, but I need something to read for working with potential problems. For example, on a website, if something can only happen if the user tampers with data via javascript, do you write for that? Also, when do you not catch errors? When you write a class that expects a string and an int as input, and they aren't a string and int, do you check for that, or do you let it bubble up to the calling method that passed incorrect parameters? I know this is a broad topic that can't be answered in a single answer here, so what I'm looking for is a book or resource that's commonly accepted as teaching proper exception handling practice.

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• SEO optimisation problems after Google Panda [on hold]

  - by Daniel West

  I am currently trying to improve a website's SEO after it took quite a hit from the Google Panda upgrades. What are the main things I need to look at improving when trying to improve its ranking in Google? I have already made sure that the pages validate to W3C Standards, minimized css and js and done the obvious meta tags and header optimization but this hasn't made any difference yet. It could possibly be a content issue as the pages currently read much like a brochure and there were some pages with just a video and no text content on them which is also an issue. I've added a rel="nofollow" attribute to the links to these pages although i'm told this doesn't really work anymore. If anyone has any ideas let me know. Cheers!

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• Which one is better? To have link on one page or on all pages?

  - by Ervin

  I have a website: http://www.amenajari-gradini-mures.ro and I will put links on http://www.casesigradini.ro . I would like to know which one is better from the point of view of SEO: - to have one single link on the homepage OR - to have a link on every page (about 48000 pages) ? Right now I got my link up on every page. But if it's better to have it on one page only (or maybe on few main pages ) then i'll take it out the rest. Please give some arguments for your answers. Thanks

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• How to make pulseaudio work again?

  - by Pawel M.

  I was having problems with sound (mono only output), so following advice from another askubuntu question I made some edits in /etc/pulse/default.pa After rebooting I had no sound at all. So I deleted /etc/pulse/default.pa entirely and tried another reboot. I did not backup the file (stupid, I know). How to come back to working config? edit: I tried: sudo apt-get remove pulseaudio (reboot) sudo apt-get install pulseaudio (reboot) It's still not working. The file /etc/pulse/default.pa is missing. Here's what pulseaudio and pacmd commands show: $ pulseaudio E: [pulseaudio] main.c: Daemon startup without any loaded modules, refusing to work. $ pacmd No PulseAudio daemon running, or not running as session daemon.

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• Java regex patterns - compile time constants or instance members?

  - by KepaniHaole

  Currently, I have a couple of singleton objects where I'm doing matching on regular expressions, and my Patterns are defined like so: class Foobar { private final Pattern firstPattern = Pattern.compile("some regex"); private final Pattern secondPattern = Pattern.compile("some other regex"); // more Patterns, etc. private Foobar() {} public static Foobar create() { /* singleton stuff */ } } But I was told by someone the other day that this is bad style, and Patterns should always be defined at the class level, and look something like this instead: class Foobar { private static final Pattern FIRST_PATTERN = Pattern.compile("some regex"); private static final Pattern SECOND_PATTERN = Pattern.compile("some other regex"); // more Patterns, etc. private Foobar() {} public static Foobar create() { /* singleton stuff */ } } The lifetime of this particular object isn't that long, and my main reason for using the first approach is because it doesn't make sense to me to hold on to the Patterns once the object gets GC'd. Any suggestions / thoughts?

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• OpenGL ES Basic Fragment Shader help with transparency

  - by Chris

  I have just spent my first half hour playing with the shader language. I have modified the basic program I have which renders the texture, to allow me to colour the texture. varying vec2 texCoord; uniform sampler2D texSampler; /* Given the texture coordinates, our pixel shader grabs the corresponding * color from the texture. */ void main() { //gl_FragColor = texture2D(texSampler, texCoord); gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).xyz,1); } I have noticed how this affects my transparent textures, and I believe I am loosing the alpha channel which would explain why previously transparent area's appear totally black. If I use the following line instead, I am shown the transparent area's gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).aaa,1); How can I retain the transparency after this modification to the colour? I have seen various things about a .w property, and also luminous, but my tweaks with those and the .aaa property are not working XD

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• How do I ban a wifi network in Network Manager?

  - by Chris Conway

  My wifi connection drops sometimes and, for some reason, Network Manager attempts to connect to my neighbor's network, which requires a password that I don't know. The network in question is not listed in the "Edit Connections..." dialog and I can find no reference to it in any configuration file, but still the password dialog pops up every time my main connection drops. Is there a way to blacklist a wireless network so that the Network Manager will never attempt to connect to it? Or, equivalently, how can I remove the configuration data that causes the Network Manager to attempt to connect to this particular network?

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• Google Analytics Goal Tracking for Sub-Domains?

  - by Hasan Khan

  I am trying to track goals in Google Analytics for a website that has the goal URL on a sub-domain. The main domain for example is: domain.com and the sub-domain is my.domain.com. I have Google Analytics configured to track domains and all sub-domains and I've eve set up an advanced filter so I can see traffic to my sub-domains in Analytics. However, in goal tracking, you're supposed to put in the website URL after the front (so if it were domain.com/conversions/ you'd put in just /conversions/). However, since for me it would be my.domain.com/conversions/, how would I input that URL into Analytics to track? Would Analytics automatically determine the URL to be on the sub-domain? Thanks!

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• Backup files with rsync: error 23

  - by maria

  Hi I'm trying to make a backup of my /home to transfer all data from one computer to another. I wanted to save the backup on the same computer and than transfere it to another one. For safety reasons, I'm trying to learn how does it work on the computer without a lot of data (the new one) to be sure I won't delete something instead of copying it. I've run in terminal: sudo rsync -avz /home/maria /home/guest/backup and I had as the result: sent 58797801 bytes received 23050 bytes 4705668.08 bytes/sec total size is 100202958 speedup is 1.70 rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1060) [sender=3.0.7] I've tried once again, with the same result. I have no idea, which files were not transferred, what makes the whole backup useless for me (I wanted to do it automatically in order not to forget about something and loose it). On both computers I have the same system (Ubuntu 10.04). Rsync version: 3.0.7-1ubuntu1. Thanks for any tips

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• Standby Problem, PC can not enter Standby mode

  - by Leon95

  I have a problem with the Standby function: My Computer does not enter the Standby mode with Ubuntu 14.04LTS. If I remeber me right it, works with Ubuntu 13.10 but this Version was not long installed on this PC. Now when i press Standby in the menu or on my Keyboard the Display turns black for a few seconds, then some messages appear for a very short moment on the screen. After that, the the log-in screen appear. Two times I was able to enter Standby but the other times it fails. Tecnical Data about my PC: Ubuntu 14.04 with all Updates main storage: 3,8GiBprocessor: Intel® Core™ i3-2330M CPU @ 2.20GHz × 4 graphic: Intel® Sandybridge Mobile graphic board: NVIDA GEFORCE GT 555M CUDA 1GB Dual Boot System with win7 x64Bit Medion P6812 Laptop Here is the message output: Usally I got only a half of the screen filled with messages like that. When I filmed it it was much more. I dont know, maybe this is a Bug.

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• FISL 12, Sao Jose Do Rio Preto, Brasilia, DFJUG, Goiania, and The Developers Conference, Sao Paolo

  - by arungupta

  Java EE 6/7 and GlassFish are visiting multiple cities in Brazil: Jun 26 - Jul 2 FISL 12, Porto Alegre Jul 3 Sao Jose Do Rio Preto JUG Jul 4 - 5 DFJUG Taguatinga, Brasilia and other venues Jul 6 - 7 Goiania JUG and other venues Jul 8 - 9 The Developers Conference, Sao Paolo Even though my main focus will be Java EE 6/7 and GlassFish but feel free to ask any question. There are several speakers from Oracle at FISL so stop by at the booth and talk to us. @paulojeronimo, with the help of the local community, organized a 10k run on the morning of Jul 5th. So please feel free to run along, should be fun. @raphaeladrien mentioned about some nice parks near my hotel in Goiania so you'll find me running there as well. There will be interesting discussions around different Web frameworks in Goiania. And then there are always 4 things to not miss in Brazil - Churrascaria, Guarana, Coffee, Caipirinha. Where will I see you ?

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• FISL 12, Sao Jose Do Rio Preto, Brasilia, DFJUG, Goiania, and The Developers Conference, Sao Paolo

  - by arungupta

  Java EE 6/7 and GlassFish are visiting multiple cities in Brazil: Jun 26 - Jul 2 FISL 12, Porto Alegre Jul 3 Sao Jose Do Rio Preto JUG Jul 4 - 5 DFJUG Taguatinga, Brasilia and other venues Jul 6 - 7 Goiania JUG and other venues Jul 8 - 9 The Developers Conference, Sao Paolo Even though my main focus will be Java EE 6/7 and GlassFish but feel free to ask any question. There are several speakers from Oracle at FISL so stop by at the booth and talk to us. @paulojeronimo, with the help of the local community, organized a 10k run on the morning of Jul 5th. So please feel free to run along, should be fun. @raphaeladrien mentioned about some nice parks near my hotel in Goiania so you'll find me running there as well. There will be interesting discussions around different Web frameworks in Goiania. And then there are always 4 things to not miss in Brazil - Churrascaria, Guarana, Coffee, Caipirinha. Where will I see you ?

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• Moving around/avoiding obstacles

  - by János Harsányi

  I would like to write a "game", where you can place an obstacle (red), and then the black dot tries to avoid it, and get to the green target. I'm using a very easy way to avoid it, if the black dot is close to the red, it changes its direction, and moves for a while, then it moves forward to the green point. How could I create a "smooth" path for the computer controlled "player"? Edit: Not the smoothness is the main point, but to avoid the red blocking "wall" and not to crash into it and then avoid it. How could I implement some path finding algorithm if I just have basically 3 points? (And what would it make the things much more complicated, if you could place multiple obstacles?)

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• Ipod scrobbling to last.fm?

  - by Crud Mucosa

  The Amarok 1.4 series scrobbled the songs I played via ipod (and also had great ipod song transfer functionality). I've not been able to scrobble songs played via my ipod then synced to a media player since my upgrade to 11.10 (and the subsequent total loss of Amarok 1.4). I see various media players (clementine, banshee) have requests in for this feature but I'd like to believe that something, somewhere has ipod scrobbling in Ubuntu! Was the 1.4 series of Amarok the only thing that had it? Good music management is one of the main reasons I've used Linux (besides stability, clean interfaces, ease of development, etc). The lack of ipod scrobbling to last.fm makes me a very sad panda.

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• Customizing configuration with Dependency Injection

  - by mathieu

  I'm designing a small application infrastructure library, aiming to simplify development of ASP.NET MVC based applications. Main goal is to enforce convention over configuration. Hovewer, I still want to make some parts "configurable" by developpers. I'm leaning towards the following design: public interface IConfiguration { SomeType SomeValue; } // this one won't get registered in container protected class DefaultConfiguration : IConfiguration { public SomeType SomeValue { get { return SomeType.Default; } } } // declared inside 3rd party library, will get registered in container protected class CustomConfiguration : IConfiguration { public SomeType SomeValue { get { return SomeType.Custom; } } } And the "service" class : public class Service { private IConfiguration conf = new DefaultConfiguration(); // optional dependency, if found, will be set to CustomConfiguration by DI container public IConfiguration Conf { get { return conf; } set { conf = value; } } public void Configure() { DoSomethingWith( Conf ); } } There, the "configuration" part is clearly a dependency of the service class, but it this an "overuse" of DI ?

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• SSL setup with GoDaddy subdomains and EC2 servers

  - by Kevin

  We have two EC2 instances that are used to host various scripts. Our main page 'companyname.com' is hosted with GoDaddy but is unrelated to those EC2 instances. I need to setup SSL connections for the two EC2 microinstances, one running Linux AMI and the other running Windows Server. I purchased two single-domain Comodo certificates and am at the part to generate CSR's on the instances. I'm not sure what to put as "Server Name" on EC2. I would like each server to be accessible through a subdomain which I have forwarded on GoDaddy to the elastic IPs on EC2. For server name, do I use the elastic ip, the EC2 public dns, or the subdomain that I want? And which of these do I then place in my VirtualHosts file on Apache? The Windows instance is running IIS7 but the Apache box is priority.

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• Should I use title case in URLs?

  - by Amadiere

  We are currently deciding on a consistent naming convention across a site with multiple web applications. Historically, I've been an advocate of the 'lowercase all the letters!' when creating URLs: http://example.com/mysystem/account/view/1551 However, within the last year or two, specifically since I began using ASP.NET MVC & had more dealings with REST based URLs, I've become a fan of capitalizing the first letter of each section/word within the URL as it makes it easier to read (imho). http://example.com/MySystem/Account/View/1551 We're not in a situation where people need to read or be able to understand the URLs, so that's not a driver per se. The main thing we are after is a consistent approach that is rational and makes sense. Are there any standards that declare it good to do one way or another, or issues that we may run into on (at least realistically modern) setups that would choose a preference over another? What is the general consensus for this debate currently?

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• How to change the sprite colors

  - by Mr_Qqn

  In my rhythm game, I have a note object which can be of different colors depending on the note chart. I could use a sprite sheet with all the different color variations I use, but I would prefer to parametrize this. (For information, a note sprite is compound with one main color, for example a red note has only red, light red and dark red.) So, how to change the colors of a sprite basing on a new color ? I'm working with opengl, but any algorithm or math explanation will do. :) Thanks

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• Secure Deployment of Oracle VM Server for SPARC - updated

  - by Stefan Hinker

  Quite a while ago, I published a paper with recommendations for a secure deployment of LDoms.  Many things happend in the mean time, and an update to that paper was due.  Besides some minor spelling corrections, many obsolete or changed links were updated.  However, the main reason for the update was the introduction of a second usage model for LDoms.  In a very short few words: With the success especially of the T4-4, many deployments make use of the hardware partitioning capabilities of that platform, assigning full PCIe root complexes to domains, mimicking dynamic system domains if you will.  This different way of using the hypervisor needed to be addressed in the paper.  You can find the updated version here: Secure Deployment of Oracle VM Server for SPARCSecond Edition I hope it'll be useful!

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• managing information/functionality on shared common project classes

  - by ilansch

  In my company, we have a common solution the contains common projects (2 projects so far, one for .net 3.5 and one for .net 4.5). My main problem is that during time, a lot of code is added, for example hosting a process as windows service is a class called ServiceManagement, But no one but the developer knows it, and if someone wants to use this shared class, he does not know it exist. So i am looking for a way to document and manage all the classes with tags, a 3rd party util/web util, that i can search for tags and maybe find common classes that i can use (if we keep all our code well-documented). Does anyone familiar with sort of tools ?

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• Mass Metadata Updates with Folders

  - by Kyle Hatlestad

  With the release of WebCenter Content PS5, a new folder architecture called 'Framework Folders' was introduced.  This is meant to replace the folder architecture of 'Folders_g'.  While the concepts of a folder structure and access to those folders through Desktop Integration Suite remain the same, the underlying architecture of the component has been completely rewritten.  One of the main goals of the new folders is to scale better at large volumes and remove the limitations of 1000 content items or sub-folders within a folder.  Along with the new architecture, it has a new look and a few additional features have been added.  One of those features are Query Folders.  These are folders that are populated simply by a query rather then literally putting items within the folders.  This is something that the Library has provided, but it always took an administrator to define them through the Web Layout Editor.  Now users can quickly define query folders anywhere within the standard folder hierarchy. [ Read More ]

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• Should my blog be directly on my website?

  - by steve

  I have my newly launched website at www.slicify.com (redirects to a secure subdomain). I currently have a separate blog on WordPress: slicify.wordpress.com for a couple of reasons: I don't really want to mix my site code (it's a complex ecommerce site written in ASP.Net) with blog code, for ease of maintenance etc. WordPress is already great at blogs - seems silly to reinvent the wheel by trying to integrate blog functionality into my site However is keeping my blog on a separate domain going to hurt me in terms of PageRank or traffic? FWIW: while it's early days, I can see from Google Analytics that a good deal of referral traffic is already coming from my WordPress site to my main site, so at least that seems to be drawing potential users in.

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• What options do individual have to fork a project?

  - by skrco

  Let's assume our example individual has an idea, engagement, ... to fork project. By project I mean any kind of software - thick client, web site, portal, service, driver, plc, ... - anything that can be programmed. Motto of question: What options do our example individual have to fork this project from the early beginning through getting collaborators and users to mature software? Here are the main subquestions: Sandbox phase: Where can he announce his idea and proposal and receive positive/negative critic and feedback? Development phase: Where can he build his team to work on this project? Yet deployed phase: Where can he schedule tasks, assign tickets and bugs to be solved? and the list can go on... What really interests me is the "sandbox phase question".

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• Simulating an object floating on water

  - by Aaron M

  I'm working on a top down fishing game. I want to implement some physics and collision detection regarding the boat moving around the lake. I would like for be able to implement thrust from either the main motor or trolling motor, the effect of wind on the object, and the drag of the water on the object. I've been looking at the farseer physics engine, but not having any experience using a physics engine, I am not quite sure that farseer is suitable for this type of thing(Most of the demos seem to be the application of gravity to a vertical top/down type model). Would the farseer engine be suitable? or would a different engine be more suitable?

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• What is involved for a simple UDP game?

  - by acidzombie24

  I once tried to write a simple game with UDP in a week as a throwaway test. It went horribly. I threw it away early. The main problem i had was restoring the game state of all players/enemies/objects to an old state and fast forward the game to the point of time the player is playing (ie half a second before a jump. A little early or late can make the player miss the jump) Maybe this method is not the easiest way? i suspect it to be but i designed it wrong from the beginning and realized at the end of 2nd day. (so i didnt learn too much or wasted that much time) For myself and others, What is involved for a simple UDP game and how do i write one? Or how do i solve the prediction problem restoring to state properly. I'll mark this as CW bc i know there will be lots of helpful answers.

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