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Why am I getting a NoClassDefFoundError in Java?

....NoClassDefFoundError This exception indicates that the JVM looked in its internal class definition data structure for the definition of a class and did not find it. This is different than saying that it could not be loaded from the classpath. Usually this indicates that we previously attempted t...
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When do I really need to use atomic instead of bool? [duplicate]

... can see old value even after another thread has changed it to new. Atomic introduces memory barrier, so it becomes impossible. share | improve this answer | follow ...
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Pandas get topmost n records within each group

... 1 2 3 1 2 2 6 4 5 3 3 7 1 4 8 1 dtype: int64 There's a slight weirdness that you get the original index in there as well, but this might be really useful depending on what your original index was. If you're not interested in it, you can do .reset_index(level=1,...
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Scaling Node.js

...l.com').len(6, 64).isEmail(); //Methods are chainable check('abc').isInt(); //Throws 'Invalid integer' check('abc', 'Please enter a number').isInt(); //Throws 'Please enter a number' check('abcdefghijklmnopzrtsuvqxyz').is(/^[a-z]+$/); //Sanitize / Filter var...
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Random row selection in Pandas dataframe

... Thanks @eumiro. I also worked out that df.ix[np.random.random_integers(0, len(df), 10)] would also work. – John Apr 10 '13 at 10:58 7 ...
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Difference between Select Unique and Select Distinct

...s, foreign keys etc. For example: Create Table Employee( Emp_PKey Int Identity(1, 1) Constraint PK_Employee_Emp_PKey Primary Key, Emp_SSN Numeric Not Null Unique, Emp_FName varchar(16), Emp_LName varchar(16) ) i.e. Someone's Social Security Number would likely be a uni...
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How to set the maxAllowedContentLength to 500MB while running on IIS7?

... According to MSDN maxAllowedContentLength has type uint, its maximum value is 4,294,967,295 bytes = 3,99 gb So it should work fine. See also Request Limits article. Does IIS return one of these errors when the appropriate section is not configured at all? See also: Maximum ...
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How to add a touch event to a UIView?

...ethod - (void)handleSingleTap:(UITapGestureRecognizer *)recognizer { CGPoint location = [recognizer locationInView:[recognizer.view superview]]; //Do stuff here... } There are a bunch of built in gestures as well. Check out the docs for iOS event handling and UIGestureRecognizer. I also have ...
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How can I tell Moq to return a Task?

I've got an interface which declares 4 Answers 4 ...
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Any way to make a WPF textblock selectable?

...e a project that contains many TextBlocks/Labels, I can't really turn them into TextBoxes. What I do want to do is, add a magic apply-to-all Style to the app-level resource so it should affect all the Label/TextBlock, and make their internal text presenter as a readonly TextBox, do you know of any w...