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• I need beginner help on loading an image (2D). I have an error

  - by Seth Taddiken

  I keep getting a "NullReferenceExeption was unhandled" with "Object reference not set to an instance of an object." written under it. I have all of the images (png) correct with names and added to references. protected override void LoadContent() { spriteBatch = new SpriteBatch(GraphicsDevice); backGround = Content.Load("Cracked"); player1.playerBlock = Content.Load("square"); player2.playerBlock = Content.Load("square2"); }

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• What's the simplest way to create a page with dynamic elements?

  - by ElendilTheTall

  I'm developing a site, part of which lists training courses with dates and prices. Every year the dates and prices change, which would mean loads of manual code editing to update the pages. What I'd like to do is have a database containing the relevant information, which the course pages then reference, so we can just update the database rather than the HTML. My experience lies in static design - so, what is a simple way to achieve this?

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• New customer references for Exadata projects

  - by Javier Puerta

  Denver Regional Transportation District (USA)  Exadata, BI Suite EE, Oracle Linux, Oracle ACSDenver Regional Transportation District Deploys Engineered System in One Week for a Four-Fold Reduction in Database Operations and Management Resources Published: August 21, 2012 Balubaid Group (Saudi Arabia) Exadata, SPARC M4000, Solaris, OBIEE 11gBalubaid Group of Companies Reduces Help-Desk Complaints by 75%, Improves Business Continuity and System Response Published August 21, 2012 All customer reference collateral can be found on Oracle.com/customers. Search by content type, product, industry, region, and even keywords.

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• Does MS Access update the data on the clipboard from a query when the data in the database changes?

  - by leeand00

  I was just debugging a macro in MS Access, and when it hit the breakpoint ran a query and I copied the data from it to the clipboard. Some of the values were null before stepping to the next step, then I ran the next step which ran a query which changed the data I had on the clipboard. I then pasted the data and the values that were null before had been changed by the query...leading to a rather large WTF on my part when I pasted the data. So my question is, does MSAccess update the data on the clipboard when it changes in the database? That's the only explanation I have for what occurred there.

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• The Back Side of Exceptions

  This article illustrates the risks of exceptions being thrown where it is generally not expected, e.g., a library function or a finally block, and shows ways to prevent some insidious errors (such as inconsistency of program data or loss of exception information).

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• Advantages to Multiple Methods over Switch

  - by tandu

  I received a code review from a senior developer today asking "By the way, what is your objection to dispatching functions by way of a switch statement?" I have read in many places about how pumping an argument through switch to call methods is bad OOP, not as extensible, etc. However, I can't really come up with a definitive answer for him. I would like to settle this for myself once and for all. Here are our competing code suggestions (php used as an example, but can apply more universally): class Switch { public function go($arg) { switch ($arg) { case "one": echo "one\n"; break; case "two": echo "two\n"; break; case "three": echo "three\n"; break; default: throw new Exception("Unknown call: $arg"); break; } } } class Oop { public function go_one() { echo "one\n"; } public function go_two() { echo "two\n"; } public function go_three() { echo "three\n"; } public function __call($_, $__) { throw new Exception("Unknown call $_ with arguments: " . print_r($__, true)); } } Part of his argument was "It (switch method) has a much cleaner way of handling default cases than what you have in the generic __call() magic method." I disagree about the cleanliness and in fact prefer call, but I would like to hear what others have to say. Arguments I can come up with in support of Oop scheme: A bit cleaner in terms of the code you have to write (less, easier to read, less keywords to consider) Not all actions delegated to a single method. Not much difference in execution here, but at least the text is more compartmentalized. In the same vein, another method can be added anywhere in the class instead of a specific spot. Methods are namespaced, which is nice. Does not apply here, but consider a case where Switch::go() operated on a member rather than a parameter. You would have to change the member first, then call the method. For Oop you can call the methods independently at any time. Arguments I can come up with in support of Switch scheme: For the sake of argument, cleaner method of dealing with a default (unknown) request Seems less magical, which might make unfamiliar developers feel more comfortable Anyone have anything to add for either side? I'd like to have a good answer for him.

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• Use controller in view in MVC

  - by gavri

  I have a problem convincing my team mates why we shouldn't use (directly reference) the controller in the view when developing components in the spirit of MVC. I have invoked decoupling and natural intuition, but still those arguments didn't get through. They say, in their defense, that this is a normal compromise. What arguments are convincing? Or they are right? How can the practice of using the controller in the view could affect a project on the long run?

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• Serial Port ttyUSB0

  - by Alex

  I picked up a USB serial null modem cable, so that I can connect up to a headless linux box. As a quick test, I plugged the device into the usb null modem, and the other end I connected to a windows pc. I opened up a terminal on the windows side, with 115200 8N1. On the linux side I opened minicom with the same params. MY problem is that I can type one way from the pc and see the text on the linux minicom side. If I type on the linux side it doesnt show on the pc side. If I reverse the cable it reverses the process. I bet this is a simple issue but I haven't dealt with serial comms in ages. Thanks

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• Information I need to know as a Java Developer [on hold]

  - by Woy

  I'm a java developer. I'm trying to get more knowledge to become a better programmer. I've listed a number of technologies to learn. Instead of what I've listed, what technologies would you suggest to learn as well for a Junior Java Developer? I realize, there's a lot of things to study. Java: - how a garbage collector works - resource management - network programming - TCP/IP HTTP - transactions, - consistency: interfaces, classes collections, hash codes, algorithms, comp. complexity concurrent programming: synchronizing, semafores steam management metability: thread-safety byte code manipulations, reflections, Aspect-Oriented Programming as base to understand frameworks such as Spring etc. Web stack: servlets, filters, socket programming Libraries: JDK, GWT, Apache Commons, Joda-Time, Dependency Injections: Spring, Nano Tools: IDE: very good knowledge - debugger - profiler - web analyzers: Wireshark, firebugs - unit testing SQL/Databases: Basics SELECTing columns from a table Aggregates Part 1: COUNT, SUM, MAX/MIN Aggregates Part 2: DISTINCT, GROUP BY, HAVING + Intermediate JOINs, ANSI-89 and ANSI-92 syntax + UNION vs UNION ALL x NULL handling: COALESCE & Native NULL handling Subqueries: IN, EXISTS, and inline views Subqueries: Correlated ITH syntax: Subquery Factoring/CTE Views Advanced Topics Functions, Stored Procedures, Packages Pivoting data: CASE & PIVOT syntax Hierarchical Queries Cursors: Implicit and Explicit Triggers Dynamic SQL Materialized Views Query Optimization: Indexes Query Optimization: Explain Plans Query Optimization: Profiling Data Modelling: Normal Forms, 1 through 3 Data Modelling: Primary & Foreign Keys Data Modelling: Table Constraints Data Modelling: Link/Corrollary Tables Full Text Searching XML Isolation Levels Entity Relationship Diagrams (ERDs), Logical and Physical Transactions: COMMIT, ROLLBACK, Error Handling

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• Can not install Netbeans after upgrade version Ubuntu from 12.04 to 12.10

  - by Kannika

  This is message error from Terminal : coca@Bakorng:/var/www/shared$ sh netbeans-7.2-ml-php-linux.sh Configuring the installer... Searching for JVM on the system... Extracting installation data... Running the installer wizard... Can`t initialize UI Running in headless mode Exception: java.awt.HeadlessException thrown from the UncaughtExceptionHandler in thread "main" coca@Bakorng:/var/www/shared$ How to fixed this?

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• Finding Tools Guidance in OUM

  - by user716869

  OUM is not tool – specific. However, it does include tool guidance.  Tool guidance in OUM includes: a mention of a tool that could be used to complete a specific task(s) templates created with a specific tool example work products in a specific tool links to tool resources Tool Supplemental Guides So how do you find all this helpful tool information? Start at the lowest level first – the Task Overview.  Even though the task overviews are written tool-agnostic, they sometimes mention suggestions, or examples of a tool that might be used to complete the task.  More specific tool information can be found in the Task Overview, Templates and Tools section.  In some cases, the tool used to create the template (for example, Microsoft Word, Powerpoint, Project and Visio) is useful. The Templates and Tools section also provides more specific tool guidance, such as links to: White Papers Viewlets Example Work Products Additional Resources Tool Supplemental Guides If you’re more interested in seeing what tools might be helpful in general for your project or to see if there is any tool guidance for a specific tool that your project is committed to using, go to the Supplemental Guidance page in OUM.  This page is available from the Method Navigation pull down located in the header of almost every OUM page. When you open the Supplemental Guidance page, the first thing you see is a table index of everything that is included on the page.  At the top of the right column are all the Tool Supplemental Guides available in OUM.  Use the index to navigate to any of the guides. Next in the right column is Discipline/Industry/View Resources and Samples.  Use the index to navigate to any of these topics and see what’s available and more specifically, if there is any tool guidance available.  For example, if you navigate to the Cloud Resources, you will find a link to the IT Strategies from Oracle page that provides information for Cloud Practitioner Guides, Cloud Reference Architectures and Cloud White Papers, including the Cloud Candidate Selection Tool and Cloud Computing Maturity Model. The section for Method Tool and Technique Cross References can take you to the Task to Tool Cross Reference.  This page provides a task listing with possible helpful tools and links to more information regarding the tools.  By no means is this tool guidance all inclusive.  You can use other tools not mentioned in OUM to complete an OUM task. The Method Tool and Technique Cross References can also take you to the various Technique pages (Index and Cross References).  While techniques are not necessarily “tools,” they can certainly provide valuable assistance in completing tasks. In the Other Resources section of the Supplemental Guidance page, you find links to the viewlets and white papers that are included within OUM.

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• ubuntu switched back to ubuntu-2d in 12.04

  - by ved2254

  This problem may have been reported earlier but I was unable to find a solution to this. after trying to install Nvidia drivers my Ubuntu session changed to ubuntu-2d and I am unable to restore it to Ubuntu 3d. Which drivers I may need to install/remove to solve this problem? For further reference, heres a pic of how my workspace switcher looks like when changing workspaces. I would like it to be as it was when Ubuntu was first installed.

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• Why DbContext object shouldn't be referred in Service Layer?

  - by nazmoonnoor

  I've been looking for some implementations of Service Layer and Controller interaction in blogs and in some open source projects. All of them seem to refer DbContext object in repository classes but avoided to use in service classes. Service classes essentially using a IQueryable<T> references of DbSet<T>. I want to know why this practice is good and why DbContext shouldn't have a reference in Service Layer.

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• SQL Server 2012 disponible en version finale : AlwaysOn, Big Data, Power View, Microsoft tient ses promesses

  SQL Server 2012 disponible en version finale AlwaysOn, Big Data, Power View, la plateforme de gestion et d'analyse d'information de Microsoft tient ses promesses Mise à jour du 03/04/2012 Comme l'avait promis Microsoft, la version finale de SQL Server 2012 est disponible depuis le 1er avril, mais a été annoncée officiellement hier. La plateforme de gestion et d'analyse d'information de Microsoft a été conçue pour être l'environnement de référence des applications critiques d'entreprise, offrir une solution décisionnelle plus complète intégrant le Big Data et permettre une meilleure connexion avec le Cloud. ...

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• Managing a Web Portal

  - by A competent translator

  After skimming almost all questions tagged "books" here at Pro Webmasters to find a book on managing web portals I found references to general web mastering. Are there books on managing and curating content of public web portals , i.e. a governmental portal for a given department or agency ? I need a reference on the day-to-day management and best practices of a portal and its content. Also welcomed are references on managing multilingual portals.

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• What are the differences between Special Edition and the Third Edition of Stroustrup's The C++ Programming Language?

  - by TheBlueCat

  I'm buying a few C++ books after moving from Java. I obviously want to read the reference manual from the man himself, though I cannot tell the difference between these two editions. The special edition is ten pages shorter than the third edition. However, the special edition is recommended over the third edition and it seems this version covers the ASCII standard when the other edition does not. Can anyone shed a bit of light on this?

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• how to install oracle 10g xe on ubuntu 11.04

  - by ses

  I have read from here how to install oracle 10g xe in ubuntu 10.x but not in 11.04 (64 bit). But with 11.04 it does not work anymore because of dependency exceptions. So, how to install oracle 10g xe in ubuntu 11.04? I even found some variant how to fix it from here but in my case it does not work - the same exception take place: oracle-xe-universal:i386 depends on libc6 (= 2.3.2); however: Package libc6:i386 is not installed.

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• Visual Studio 2010 Web Development Improvements

  - by Aamir Hasan

  VS2010 emulates what is available in previous framework versions through reference assemblies. These assemblies contain metadata that describes functionality available in previous versions. VS2010 itself uses the .NET 4 framework, so when adding multitargeting support the team decided against running a previous framework version inside the same process. When your application is compiled to 100 percent guarantee application compatibility, previous compiler versions are used.Web development in Visual Studio 2010 has been enhanced for greater CSS compatibility, increased productivity through HTML and ASP.NET markup snippets and new dynamic IntelliSense JavaScript.Improved CSS CompatibilityHTML and JavaScript SnippetsJavaScript IntelliSense Enhancements

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• Update app.config key value at run time in WPF

  In this article I am going to show how we can update a key value in app.config file in WPF. For this add reference of System.Configuration in your application.

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• Sys.WebForms.PageRequestManagerServerErrorException: An entity object cannot be referenced by multiple instances of IEntityChangeTracker [closed]

  - by Mingebag

  `Story: I have a strange error when I try to save something I got this error message An entity object cannot be referenced by multiple instances of IEntityChangeTracker. I really don’t know what that is and why is it appear, it appears only when I try to save something my insert and update is working, only when I try to save something in db from my Telerik grid if (this.annualVacationList != null) { List<AnnualVacation> vacationToSave = this.annualVacationList; IEnumerable<AnnualVacation> existing = paramUser.AnnualVacations; foreach (AnnualVacation toSave in vacationToSave) { AnnualVacation existingItem = existing.Where(x => x.AnnualVacationId == toSave.AnnualVacationId).SingleOrDefault(); if (existingItem == null) { ctx.AddToAnnualVacations(toSave); } else { existingItem.FromDate = toSave.FromDate; existingItem.ToDate = toSave.ToDate; existingItem.WorkingTime = toSave.WorkingTime; existingItem.VacationDays = toSave.VacationDays; } } } ctx.SaveChanges(); } After debugging I have seen that the code brake down in the Project.Name.Designer.cs ..... O.o public void AddToAnnualVacations(AnnualVacation annualVacation) { base.AddObject("AnnualVacations", annualVacation); }

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• EC2 Amazon Linux AMI MySQL CPU @ 62% When Idle?

  - by Jeff

  I am running MySQL on an Amazon Linux AMI. There is nothing connected to it. There are no connections and no other applications running that use MySQL. It is completely idle, but yet, top is reporting that mysql is using 62% of the CPU? Why is this happening and how do I fix it? Cpu(s): 0.2%us, 0.2%sy, 0.0%ni, 97.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.7%st Mem: 1738504k total, 390708k used, 1347796k free, 56888k buffers Swap: 917500k total, 0k used, 917500k free, 229804k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2959 mysql 20 0 466m 39m 5244 S 62.2 2.3 4:00.67 mysqld 1 root 20 0 19252 1504 1212 S 0.0 0.1 0:00.20 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd There are no connections... mysql> show processlist; +----+------+-----------+------+---------+------+-------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+------+-----------+------+---------+------+-------+------------------+ | 5 | root | localhost | NULL | Query | 0 | NULL | show processlist | +----+------+-----------+------+---------+------+-------+------------------+

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• Enemy collision detection with movie clips

  - by user18080

  I have created multiple movieclips with animations within them. It is an obstacle avoidance game and I cannot seem to be able to get my enemies to contact my playableCharacter. The enemies I have created are each embedded on certain levels of my game. I have created an array, enemiesArray to have each of my enemies placed within it. Here is the code for that: //step 1: make sure array exists if(enemiesArray!=null && enemiesArray.length!=0) { //step 2: check all enemies against villain for(var i:int = 0;i < enemiesArray.length; i++) { //step 3: check for collision if(villain.hitTestObject(enemiesArray[i])) { //step 4: do stuff trace("HIT!"); removeChild(enemiesArray[i]); enemiesArray.splice(i,1); removeChild(villain); villain = null; } } } What I am unsure of is whether or not my enemiesArray is actually holding the movieclips I have suggested. If it was, this code would be tracing back a "HIT" for every time I ran into an enemy and would kill my character. It is not doing that however. I am thinking I have to push my movieclips into my array but I don't know how to do that or where for that matter. Any and all help would be much appreciated.

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• From the Coalface - 3 - Work as hard as you can to be as lazy as you can!

  - by TATWORTH

  The saga of the Change Log A recent conversation reminded me of the need for change logs within a database, to record when various change scripts were run. Creating such the required table is simple. A typical table for this consists of: Id - identity Integer primary key ChangeFileName - NVARCHAR(128) to hold the name of the file run. DateAdded - DateTime non-null with default value of getutcdate() Purpose - NVARCHAR(128) Rerunnable - Bit non-null default 0. By good design of the table only two data values normally need to be supplied. Two stored procedures, one for inserting data and one to list in reverse sequence the log complete the database essentials. The complete implementation can be found in the CommonData solution at http://CommonData.CodePlex.Com By including a call the add Change Log stored procedure, each script can log its name and purpose for posterity. The scripts that were applied to say the UAT system and their sequence of application can be readily identified for running on the Live system. Formatting XML XML is often produced as one continous string with no embedded CR/LF. To get it into human readable form, open it in visual studio, swap to another tab and back and click the format document button. The XML will then be nicely formatted!

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• Showing an Action on a TopComponent Node

  - by Geertjan

  Let's say you want to extend the tools in NetBeans IDE, specifically for TopComponents. When the user right-clicks in the Projects window (or Files window or Favorites window) on a Java class that extends TopComponent, a menu item should be available for branding the TopComponent. What "branding" entails is, at this stage, a secondary question. The primary question, from an implementation point of view, is "how do I create an action that is only shown when the user right-clicks on a TopComponent?" Here's the solution, in NetBeans IDE 7.2 (the "lazy" attribute, here set to false, is new in 7.2): import com.sun.source.tree.ClassTree; import com.sun.source.util.TreePathScanner; import java.awt.event.ActionEvent; import java.io.IOException; import javax.lang.model.element.Element; import javax.lang.model.element.TypeElement; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JOptionPane; import org.netbeans.api.java.source.CompilationController; import org.netbeans.api.java.source.CompilationInfo; import org.netbeans.api.java.source.JavaSource; import org.netbeans.api.java.source.JavaSource.Phase; import org.netbeans.api.java.source.Task; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionReferences; import org.openide.awt.ActionRegistration; import org.openide.awt.DynamicMenuContent; import org.openide.loaders.DataObject; import org.openide.util.ContextAwareAction; import org.openide.util.Exceptions; import org.openide.util.Lookup; import org.openide.util.NbBundle.Messages; import org.openide.util.Utilities; @ActionID(     category = "Tools", id = "org.tc.customizer.BrandTopComponentAction") @ActionRegistration(     displayName = "#CTL_BrandTopComponentAction",     lazy = false) @ActionReferences({     @ActionReference(path = "Loaders/text/x-java/Actions", position = 150) }) @Messages("CTL_BrandTopComponentAction=Brand") public final class BrandTopComponentAction extends AbstractAction implements ContextAwareAction {     private final DataObject dobj;     public BrandTopComponentAction() {         this(Utilities.actionsGlobalContext());     }     public BrandTopComponentAction(Lookup context) {         super(Bundle.CTL_BrandTopComponentAction());         this.dobj = context.lookup(DataObject.class);         //Enable the menu item only if we're dealing with a TopComponent         JavaSource javaSource = JavaSource.forFileObject(dobj.getPrimaryFile());         try {             javaSource.runUserActionTask(new ScanForTopComponentTask(this), true);         } catch (IOException ex) {             Exceptions.printStackTrace(ex);         }         //Hide the menu item if it isn't enabled:         putValue(DynamicMenuContent.HIDE_WHEN_DISABLED, true);     }     @Override     public void actionPerformed(ActionEvent ev) {         JOptionPane.showMessageDialog(null, "Hurray, I am a TopComponent!");         //Now add your code for showing a dialog,         //where the dialog will display UI for branding the TopComponent somehow         //and retrieve those branding values         //and then change the TopComponent class accordingly.     }     @Override     public Action createContextAwareInstance(Lookup actionContext) {         return new BrandTopComponentAction(actionContext);     }     private static class ScanForTopComponentTask implements Task<CompilationController> {         private final BrandTopComponentAction action;         private ScanForTopComponentTask(BrandTopComponentAction action) {             this.action = action;         }         @Override         public void run(CompilationController compilationController) throws Exception {             compilationController.toPhase(Phase.ELEMENTS_RESOLVED);             new MemberVisitor(compilationController, action).scan(                     compilationController.getCompilationUnit(), null);         }     }     private static class MemberVisitor extends TreePathScanner<Void, Void> {         private CompilationInfo info;         private final AbstractAction action;         public MemberVisitor(CompilationInfo info, AbstractAction action) {             this.info = info;             this.action = action;         }         @Override         public Void visitClass(ClassTree t, Void v) {             Element el = info.getTrees().getElement(getCurrentPath());             if (el != null) {                 TypeElement te = (TypeElement) el;                 if (te.getSuperclass().toString().equals("org.openide.windows.TopComponent")){                     action.setEnabled(true);                 } else {                     action.setEnabled(false);                 }             }             return null;         }     } } The code above is the result of combining various tutorials found on the NetBeans Platform Learning Trail.

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• Trouble running multiple Firefox versions on OS X Lion

  - by politicus

  I am trying to use two versions of Firefox (11 and 13) on OS X Lion. I don't especially want to run two versions at the same time. I want to be able to run the version 11 when I choose the version 11 via the profile manager. The same for the version 13. Every time, I want to launch the version 11, the launcher launches the version 13... When I select the version 11 via the profile manager, Firefox 13 is launched. I created 2 automators apps (FF11.app and FF13.app) to launch Firefox : /Applications/Firefox11.app/Contents/MacOS/firefox-bin -no-remote -P FF11 & /dev/null & /Applications/Firefox13.app/Contents/MacOS/firefox-bin -no-remote -P FF13 & /dev/null & Any help would be greatly appreciated. Thanks in advance.

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