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Which characters are valid in CSS class names/selectors?

...ls are allowed within the CSS class selectors? I know that the following characters are invalid , but what characters are valid ? ...
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HTTP response code for POST when resource already exists

I'm building a server that allows clients to store objects. Those objects are fully constructed at client side, complete with object IDs that are permanent for the whole lifetime of the object. ...
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Where do “pure virtual function call” crashes come from?

I sometimes notice programs that crash on my computer with the error: "pure virtual function call". 8 Answers ...
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What is the single most influential book every programmer should read? [closed]

If you could go back in time and tell yourself to read a specific book at the beginning of your career as a developer, which book would it be? ...
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How can I restart a Java application?

... Of course it is possible to restart a Java application. The following method shows a way to restart a Java application: public void restartApplication() { final String javaBin = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java"; final File currentJar = ne...
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Correct use of flush() in JPA/Hibernate

I was gathering information about the flush() method, but I'm not quite clear when to use it and how to use it correctly. From what I read, my understanding is that the contents of the persistence context will be synchronized with the database, i. e. issuing outstanding statements or refreshing enti...
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How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?

In a recent interview, I was asked a really strange question. The interviewer asked me how can I compute 1+2+3+...+1000 just using compiler features. This means that I am not allowed to write a program and execute it, but I should just write a program that could drive the compiler to compute this su...
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Difference between GeoJSON and TopoJSON

What is the difference between GeoJSON and TopoJSON and when would I use one over the other? 3 Answers ...
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How to convert CharSequence to String?

How can I convert a Java CharSequence to a String ? 3 Answers 3 ...
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Web Service vs WCF Service

... This answer is based on an article that no longer exists: Summary of article: "Basically, WCF is a service layer that allows you to build applications that can communicate using a variety of communication mechanisms. With it, you can communicate using Peer to Peer, Nam...