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How do servlets work? Instantiation, sessions, shared variables and multithreading
...erver's memory. The web app's web.xml and all of included web-fragment.xml files is parsed, and each <servlet>, <filter> and <listener> found (or each class annotated with @WebServlet, @WebFilter and @WebListener respectively) is instantiated once and kept in the server's memory as...
How to write to file in Ruby?
I need to read the data out of database and then save it in a text file.
7 Answers
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How to duplicate virtualenv
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The easiest way is to use pip to generate a requirements file. A requirements file is basically a file that contains a list of all the python packages you want to install (or have already installed in case of file generated by pip), and what versions they're at.
To generate a requ...
Getting rid of \n when using .readlines() [duplicate]
I have a .txt file with values in it.
11 Answers
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Running a Haskell program on the Android OS
...r ARM architectures. JHC can trivially do this with a very small inf style file which describes the platform (word size, c-compiler, etc) I've done this with the Wii homebrew dev kit and it was quite easy. However jhc still has some stability issues with complex code such as using a monad transforme...
Difference between sh and bash
... a hard link.
If it's a symbolic link, a portable way to resolve it is:
% file -h /bin/sh
/bin/sh: symbolic link to bash
If it's a hard link, try
% find -L /bin -samefile /bin/sh
/bin/sh
/bin/bash
In fact, the -L flag covers both symlinks and hardlinks,
but the disadvantage of this method is t...
How to change indentation mode in Atom?
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Go to File -> Settings
There are 3 different options here.
Soft Tabs
Tab Length
Tab Type
I did some testing and have come to these conclusions about what each one does.
Soft Tabs - Enabling this means it will use spaces by...
Programmatically trigger “select file” dialog box
I have a hidden file input element. Is it possible to trigger its select file dialog box from a button's click event?
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What is a sealed trait?
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A sealed trait can be extended only in the same file as its declaration.
They are often used to provide an alternative to enums. Since they can be only extended in a single file, the compiler knows every possible subtypes and can reason about it.
For instance with the de...
Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?
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This goes in the grunt.js file?
– Oliver Dixon
Jan 2 '15 at 2:13
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