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cannot load such file — bundler/setup (LoadError)

I'm setting Rails 4 application with Ruby 2.0, but I'm getting "Web application could not be started" and get this trace: 1...
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Are static class instances unique to a request or a server in ASP.NET?

... classes and static instance fields are shared between all requests to the application, and has the same lifetime as the application domain. Therefore, you should be careful when using static instances, since you might have synchronization issues and the like. Also bear in mind, that static instanc...
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Clicking the back button twice to exit an activity

I've noticed this pattern in a lot of Android apps and games recently: when clicking the back button to "exit" the application, a Toast comes up with a message similar to "Please click BACK again to exit". ...
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java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

I'm using the support library for my app. In my FragmentActivity I'm using an AsyncTask for downloading data from internet. In the onPreExecute() method I add a Fragment and in the onPostExecute() method I remove it again. When the orientation is changed in between, I get the above mentioned excepti...
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AngularJS : Where to use promises?

...ookForAuthentication accepts a callback for failure and success, but what happens when FB.login succeeds but FB.api fails? This method always invokes the success callback regardless of the result of the FB.api method. Now imagine that you're trying to code a robust sequence of three or more asyn...
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Elegant setup of Python logging in Django

... have yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple: 4 ...
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MVC Vs n-tier architecture

...n MVC(which is an architectural pattern) and an n-tier architecture for an application. I searched for it but couldn't find a simple explanation. May be I am a bit naive on MVC concepts, so if anyone can explain the difference then it would be great. ...
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Making the Android emulator run faster

...sluggish. For some devices, like the Motorola Droid and the Nexus One, the app runs faster in the actual device than the emulator. This is a problem when testing games and visual effects. ...
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What is the difference between compile and link function in angularjs

...e., manipulation of tElement = template element), hence manipulations that apply to all DOM clones of the template associated with the directive. link function - use for registering DOM listeners (i.e., $watch expressions on the instance scope) as well as instance DOM manipulation (i.e., manipulatio...
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SHA-1 fingerprint of keystore certificate

... If you're writing Android apps on Xamarin, use this: keytool -list -v -keystore "%USERPROFILE%\AppData\Local\Xamarin\Mono for Android/debug.keystore" -alias androiddebugkey -storepass android -keypass android – Jay Sidri ...