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java.lang.NoClassDefFoundError: Could not initialize class XXX
...java.lang.ClassNotFoundException). The ClassLoader ran into an error while reading the class definition when trying to read the class.
Put a try/catch inside your static initializer and look at the exception. If you read some files there and it differs from your local environment it's very likely t...
Convert an image (selected by path) to base64 string
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Why even bother resaving it though? you can just read the file's bytes and convert those.
– Nyerguds
Feb 1 '18 at 12:43
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How are ssl certificates verified?
...rchased one has been signed by a Certificate Authority that your browser already knows about. In other words, your browser can easily validate the authenticity of a purchased certificate.
Unfortunately this has led to a common misconception that self-signed certificates are inherently less secure t...
Nodejs send file in response
...m that will send myfile.mp3 by streaming it from disk (that is, it doesn't read the whole file into memory before sending the file). The server listens on port 2000.
[Update] As mentioned by @Aftershock in the comments, util.pump is gone and was replaced with a method on the Stream prototype called...
Why avoid increment (“++”) and decrement (“--”) operators in JavaScript?
...crystal clear. The minute you add other code around that basic expression, readability and clarity begin to suffer.
– artlung
Jun 9 '09 at 17:54
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What is the purpose of the reader monad?
The reader monad is so complex and seems to be useless. In an imperative language like Java or C++, there is no equivalent concept for the reader monad, if I am not mistaken.
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What does “all” stand for in a makefile?
I read some tutorials concerning Makefiles but for me it is still unclear for what the target "all" stands for and what it does.
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In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
...at sending data to a generator even means, you need to drop everything and read about coroutines first—they're very useful (contrast them with subroutines), but unfortunately lesser-known in Python. Dave Beazley's Curious Course on Coroutines is an excellent start. Read slides 24-33 for a quick pr...
When is JavaScript synchronous?
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JavaScript is always synchronous and single-threaded. If you're executing a JavaScript block of code on a page then no other JavaScript on that page will currently be executed.
JavaScript is only asynchronous in the sense that it can make, for example, Ajax calls. The A...
What is the equivalent of MATLAB's repmat in NumPy
...le asking to manipulate the input matrix along the dimensions the matrix already has.
Thus the two commands
repmat(M,m,n) % matlab
np.tile(M,(m,n)) # python
are really equivalent for a matrix of rank 2 (two dimensions).
The matters goes counter-intuitive when you ask for repetition/tiling o...