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• How to fix "The system is running in low-graphics mode" error?

  - by jokerdino

  Note: This is an attempt to create a canonical question that covers all instances of "low-graphics mode" error that occurs to a user, including but not limited to installation of wrong drivers, incorrect or invalid lightdm greeters, low disk space, incorrect installation of graphics card like ATI and Nvidia, incorrect configuration of xorg.conf file while setting up multiple monitors among others. If you are experiencing the "low-graphics mode" error when trying to login but none of the following answers work for you, please do ask a new question and then update the answers of this canonical question as and when your new question gets answered. When I try to boot into my computer, I am getting this error: The system is running in low-graphics mode Your screen, graphics cards, and input device settings could not be detected correctly. You will need to configure these yourself. How do I fix the failsafe X mode and login into my computer? Answer index: The greeter is invalid

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• Why is "sudo virsh" hanging in the console?

  - by technophobia

  I wanted to experiment with OpenStack on my iMac: So I installed Ubuntu Cloud Live Image on a VM and I also ran DevStack on a fresh Ubuntu 64-bit Server VM. The DevStack script hangs on the following line: instances=`sudo virsh list --all | grep $INSTANCE_NAME_PREFIX | sed "s/.*\($INSTANCE_NAME_PREFIX[0-9a-fA-F]*\).*/\1/g"` I commented that block and ran the script again, this time it did not hang; thus completing its run. I attempted to run sudo virsh list --all on my CloudLive VM and it just hands until I break out of it. Why is sudo virsh hanging? Your help is appreciated. Note 1: The virsh command responds without sudo. Note 2: Not sure it matters, but I'm running my Virtual Machines in VMWare Fusion.

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• Uninstalling a SQL Server Clustered Instance

  I have installed and uninstalled several instances of SQL Server in the past. Today, I need to uninstall a SQL Server 2008 R2 clustered instance. I have never uninstalled a clustered instance of SQL Server before. Can you provide a how-to guide to uninstall a clustered instance of SQL Server 2008 R2? NEW! SQL Monitor 2.0Monitor SQL Server Central's servers withRed Gate's new SQL Monitor.No installation required. Find out more.

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• Determining if a visitor left your server

  - by Jeepstone

  We have an Apache server running a PHP website. The site is an e-commerce shop. We currently use Barclays as the payment provider but are seeing a lot of customers drop out at the point at which we transfer them to the payment gateway (hosted with Barclays) I can see specific instances in the shop where orders have been created but not paid/failed but I need to ascertain if the user has definitely left our server (or just failed to reach Barclays). Is there anything in any of the server/access logs that states when a user transferred to a different domain?

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• Rebuilding system databases in 2008 R2

  - by TiborKaraszi

  All my attempts so far to rebuild the system databases in 2008 R2 has failed. I first tried to run setup from below path: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Release But above turns out to be the 2008 setup program, not 2008R2 setup; even though I have no 2008 instanced installed (I have only R2 instances installed). Apparently, the 2008 setup program does a version check of the instance to be rebuilt and since it is > 10.50.0, the rebuild fails. Books Online for R2 the section...(read more)

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• XNA Octree with batching

  - by Alex

  I'm integrating batching in my engine. However I'm using an octree which is auto generated around my scene. Now batching renders a hole group at ones while an octree sorts out which objects that should be rendered within the camera frustum, therefore dividing the group. Batching and octree doesn't go along very well, right? Problem: The way I see it I have two options, either create batch groups based on objects who are close to one another within the octree or I can rebuild the batching matrixbuffer for the instances visible each frame. Which approach should I go with or does there exist another solution?

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• Microsoft XNA code sample wont work with blender model

  - by FreakinaBox

  I downloaded this code sample and integrated it into my game http://xbox.create.msdn.com/en-US/education/catalog/sample/mesh_instancing It works with the model that they supplied, but throws and exception whenever I use one of my models. The current vertex declaration does not include all the elements required by the current vertex shader. TextureCoordinate0 is missing. I tried pluging my model into their original source code and same thing. My model is an fbx from blender and has a texture. This is the function that throws the error GraphicsDevice.DrawInstancedPrimitives( PrimitiveType.TriangleList, 0, 0, meshPart.NumVertices, meshPart.StartIndex, meshPart.PrimitiveCount, instances.Length );

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• Building an instance system.

  - by Kyle C

  I am looking into how to design an instance system for the game I am working on. I have always wondered how these are created in games like World of Warcraft, where instances == dungeons/raids/etc). Areas that are separated from players other than those in your group, but have specific logic to them. Specifically how can you reuse your existing code base and not have a bunch of checks everywhere ? if (isInstance) do x; else do y; I don't know if this will make too much of a difference on any answers, but we're using a pretty classic "Object as pure aggregation" component system for our entities.

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• The Freemium-Premium Puzzle

  The more time I spend thinking about the value of information, the more I found that digitalizing information significantly changed the 'information markets', potentially in an irreversible manner. The graph at the bottom outlines my current view. The existing business models tend to be the same in the digital and analogue information world, i.e. revenue is derived from a combination of consumers' payments and advertisement. Even monetizing 'meta-information' such as search engines isn't new. Just think of the once popular 'Who'sWho'. What really changed is the price-value ratio. The curve is pushed down, closer to the axis. You pay less for the same, or often even get more for less. If you recall the capabilities I described in relevance of information you will see that there are many additional features available for digital content compared to analogue content. I think this is a good 'blue ocean strategy' by combining existing capabilities in a new way. (Kim W.C. & Mauborgne, R. (2005) Blue Ocean Strategies. Boston: Harvard Business School Publishing.). In addition the different channels of digital information distribution significantly change the value of information. I will touch on this in one of my next blogs. Right now, many information providers started to offer 'freemium' content through digital channels, hoping to get a premium for the 'full' content. No freemium seems to take them out of business, because they are apparently no longer visible in today's most relevant channels of information consumption. But, the more freemium is provided, the lower the premium gets; a truly puzzling situation. To make it worse, channel providers increasingly regard information as a value adding and differentiating activity. Maybe new types of exclusive, strategic alliances will solve the puzzle, introducing new types of 'gate-keepers', which - to me - somehow does not match the spirit of the WWW and the generation Y's perception of information consumption and exchange.

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• Alt + # shorcut, how to remove?

  - by Qocko

  Being a World of Warcraft player, I use keyboard combinations to cast spells and "alt + #" is one of the combination, # being the key just before the 1 2 3 4 [...], under "escape" and on top of "tab" (I have a "French(canada)" keyboard). I've searched in the keyboard options, the shorcuts parts and I found nothing, I even tried to assign it randomly, hopping it'll overwrite the real shorcut but it didn't. When I press "alt + #" I have a "alt + tab" like but just for one type of window. For exemple it'll make me navigate through many instances of folder, but it won't switch to another application. It just cycle through the open windows of one application. Help me get rid of this annoying shorcut please ! Thanks in advance.

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• Installing Silverlight applications without the browser involved

  One of the features we are introducing in Silverlight 4 is a silent install mechanism for out-of-browser applications. Currently every out-of-browser application (trusted or not) starts from an in-browser mechanism. In some instances where you want to deploy the app via managed desktop software or perhaps via CD-ROM, you dont want to have to tell the user to start on an HTML page first. Now Im not going to write here about the merits of why you might want to do this other than to point out what...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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• Should we design programs to randomly kill themselves?

  - by jimbojw

  In a nutshell, should we design death into our programs, processes, and threads at a low level, for the good of the overall system? Failures happen. Processes die. We plan for disaster and occasionally recover from it. But we rarely design and implement unpredictable program death. We hope that our services' uptimes are as long as we care to keep them running. A macro-example of this concept is Netflix's Chaos Monkey, which randomly terminates AWS instances in some scenarios. They claim that this has helped them discover problems and build more redundant systems. What I'm talking about is lower level. The idea is for traditionally long-running processes to randomly exit. This should force redundancy into the design and ultimately produce more resilient systems. Does this concept already have a name? Is it already being used in the industry?

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• How to enable a Web portal-based enterprise platform on different domains and hosts without customization [on hold]

  - by S.Jalali

  At Coscend, a cloud and communications software product company, we have built a Web portal-based collaboration platform that we like to host on five different Windows- and Linux-based servers in different hosting environments that run Web servers. Each of these Windows and Linux servers has a different host name and domain name (and IP address). Our team would appreciate your guidance on: (1) Is there a way to implement this Web portal-based platform on these Linux and Windows servers without customizing the host name, domain name and IP address for each individual instance? (2) Is there a way to create some variables using JavaScript for host name and domain name and call them from the different implementations? If a reference to the host/domain names occurs on hundreds of our pages, the variables or objects would replace that. (3) This is part of making these JavaScript modules portable and re-usable for different environments and instances. The portal is written in JavaScript that is embedded in HTML5 and padded with CSS3. Other technologies include Flash, Flex, PostgreSQL and MySQL.

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• Are there any resources for motion-planning puzzle design?

  - by Salano Software

  Some background: I'm poking at a set of puzzles along the lines of Rush Hour/Sokoban/etc; for want of a better description, call them 'motion planning' puzzles - the player has to figure out the correct sequence of moves to achieve a particular configuration. (It's the sort of puzzle that's generically PSPACE-complete if that actually helps anyone's mental image). While I have a few straightforward 'building blocks' that I can use for puzzle crafting and I have a few basic examples put together, I'm trying to figure out how to avoid too much sameness over a large swath of these kinds of puzzles, and I'm also trying to figure out how to make puzzles that have more of a feel of logical solution than trial-and-error. Does anyone know of good resources out there for designing instances of this sort of puzzle once the core puzzle rules are in place? Most of what I've found on puzzle design only covers creating the puzzle rules, not building interesting puzzles out of a set of rules.

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• Can I share data between two users in an ASP.NET Application?

  - by Dave

  I have an issue with Roles.IsUserInRole function. It take hell amount of time to just check if the logged-in user is in particular role(typ 3-9 sec). I searched to find a solution and arrived on this but I am not sure If I have fully grasped it. What I got from the above, A new derived class is created. Inside that class, there is a list which retrieves all user at once. The next time you check IsUserInRole, you do not use the actual IsUserInRole method but rather use the one you overrode in your class. Is this the correct description? Am I on track? My question is, can data be share between two different users in ASP.NET application? If yes, will the shared data exist only if there is at least one user logged in. If all users logs out, that shared data is destroyed? My point is this data will be created only one time whenever a user logs in. For all subsequent users they can use this data and check their roles against the list? I need a detailed answer. My application has users and different roles. We are using ASP.NET roles.

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• CDI 1.1 Public Review and Feedback

  - by reza_rahman

  CDI 1.1 is humming along nicely and recently released it's public review draft. Although it's just a point release, CDI 1.1 actually has a lot in it. Some the changes include: The CDI class, which provides programmatic access to CDI facilities from outside a managed bean Ability to veto beans declaratively using @Vetoed Conversations in Servlet requests Application lifecycle events in Java EE Injection of Bean metadata into bean instances Programmatic access to a container provided Producer, InjectionTarget, AnnotatedType Ability to override attributes of a Bean via BeanAttributes Ability to process modules via ProcessModule Ability to wrap the InjectionPoint Honor WEB-INF/classes/META-INF/beans.xml to activate WEB-INF/classes in a bean archive Global ordering and enablement of interceptors and decorators Global selection of alternatives @New deprecated Clarify interceptors and decorators must be implemented using proxying Allow multiple annotated types per Java class Allow Extensions to specify the annotations that they are interested in The CDI 1.1 expert group has a number of open issues that they would like immediate feedback on. These include critical issues like bean visibility, startup events and restricting CDI scans. Read the details here and let your voice be heard!

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• Does anyone have a specific example of using the Flyweight Pattern?

  - by Jeremy E

  I have been studying design patterns and came accross the fly weight pattern. I have been trying to see opportunities to use the pattern in my applications but I am having trouble seeing how to use it. Also, what are some signs that a fly weight pattern is being used when I read other peoples code? According to the definition it says: Use sharing to support large numbers of fine-grained objects efficiently. If I read it right Dictionaries and Hashtables could be instances of fly weights is this correct? Thanks in advance.

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• What happens if we serialize and deserialize two objects which references to each other?

  - by Seregwethrin

  To make it more clear, this is a quick example: class A implements Serializable { public B b; } class B implements Serializable { public A a; } A a = new A(); B b = new B(); a.b = b; b.a = a; So what happens if we serialize a and b objects into a file and deserialize from that file? I thought we get 4 objects, 2 of each. Identical objects but different instances. But I'm not sure if there's anything else or is it right or wrong. If any technology needed to answer, please think based on Java. Thank you.

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• Does anyone know of a program like Elastics for Linux?

  - by coteyr

  On mac I would use Elastics (http://tundrabot.com/elastics) To kind of, monitor my EC2 instances. Most important to me was that it worked across several accounts and that it allowed me to connect to a running instance via ssh or RDP. This was the only real feature I care about. I can not always keep the IP address of the server that is running because ec2 is elastic, and it changes frequently. Is there any tool, like Elastics for linux/unity? Again it should support several accounts and be able to give me the IP addresses of the instance I select.

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• Overriding a function in an instance [on hold]

  - by MustSeeMelons

  Is it possible to override a function by instance? For example, A and B are both instances of MyClass. I have a function Action(), and I want to specify its implementation for each instance. To be more specific - the class is a Button, and the function is Clicked(). I don't want to derive a class 5 times to create 5 different button actions. Was thinking of something like it's handled in Java Swing: create a button, add code for the button press and use the button.

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• Store scores for players and produce a high score list

  - by zrvan

  This question is derived from an interview question that I got for a job I was declined. I have asked for code review for my solution at the dedicated Stack Exchange site. But I hope this question is sufficiently rephrased and asked with a different motivation not to be a duplicate of the other question. Consider the following scenario: You should store player scores in the server back end of a game. The server is written in Java. Every score should be registered, that is, one player may have any number of scores for any number of levels. A high score list should be produced with the fifteen top scores for a given level, but only one score per user (to the effect that even if player X has the two highest scores for level Y, only the first position is counted and player Z has the second place). No information should be persisted and only Java 1.7+ standard libraries should be used. No third party libraries or frameworks are acceptable. With the number of players as the primary factor, what would be the best data structure in terms of scalability and concurrency? How would you access the structure to register a single score given a level and a player id? How would you access the structure to compile the high score list?

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• Multiple copies of JBoss acting as one? [migrated]

  - by scphantm

  I have a few ideas how to solve the problem, but one question about jboss clustering. Please, keep in mind these applications were written very poorly, that is why they require so much memory and there is nothing i can do about that right now. So, I have clustered applications on Jboss where the application was small enough to run on one box. Meaning that one machine could handle the load. But, the current problem is that i have been asked to run several systems on the same environment. Our machines are virtuals and due to limited hardware, are restricted to 8 GB RAM, which gives jboss about 7GB to itself. Unfortunately, that isn't enough to run the group of applications. Im constantly getting heap errors and crashes. If i cluster 2 or 3 jboss instances together, can i run applications that consume more resources than a single box can handle?

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• Possible to stop Adobe DreamWeaver from rewriting 'onclick' to 'onClick'? [closed]

  - by DA01

  I've been giving my dev team grief by checking in HTML edited in DW. It turns out that DW has silently been rewriting all instances of 'onclick' to 'onClick' completely breaking the application in Webkit on us. I've done some digging on Google and this appears to be a bug that goes back to at least 2004. Supposedly it has nothing to do with your code re-writing settings and what triggers it is opening any document that does not contain a Doctype. Few of ours do, given that we're maintaining a framework that's using all sorts of include and dependency files. In all my Googling, I haven't found a fix, though. Has anyone come across one short of swearing off Adobe products forever?* something, btw, that I'm perfectly fine doing...it's just that given the insane IT lockdown on our work machines, we have very few software choices. For now, It's Notepad++ for me.

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• knowing all available entity types

  - by plofplof

  I'm making a game where at some point the game will create enemies of random types. Each type of enemy available is defined on its own class derived from an enemy superclass. To do this, obviously the different types of enemies should be known. This is what I have thought of: Just make a list manually. Very simple to do, but I don't like it because I'll be adding more enemy types over time, so any time I add a new class I have to remember to update this (same if I remove an enemy). I would like some kind of auto-updating list. A completely component based system. There are no different classes for each enemy, but definitions of enemies in some file where all enemy types can be found. I really don't need that level of complexity for my game. I'm still using a component based model to some degree, but each Enemy type gets defined on its own class. Java Annotation processing. Give each enemy subclass an annotation like @EnemyType("whatever"), then code an annotation processor that writes in a file all available enemy types. Any time a new class is added the file gets updated after compilation.This gives me a feeling of failure even if its a good solution, it's very dependant on Java, so it means I cant think of a general design good for any kind of language. Also I think that this would be too much work for something so simple. I would like to see comments on these ideas and other possible solutions Thanks

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• Kooboo CMS 2.1.0.0 released

  Users of Kooboo CMS 2.0, please use the "Check updates" feature under System to upgradeNew featuresWebDav supportYou can now use tools like windows explorer to manage Binary folder. Drag and drop files directly from your Windows PC.Metaweblog API support.Enable you to manage your content via some third party tools like MS Office word or MS live writerCMIS support.an open and cross-platform protocol used for content synchronization between different systems or different Kooboo instances.RSS...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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