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Can't stop rails server
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If Webrick is running, then its PID is in {APP_ROOT}/tmp/pids/server.pid file so you don't have to look for it -- as long as server is running. So, if instead of doing ctrl-c you just run that kill command in another terminal, it will kill Webrick server immediately.
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Understanding checked vs unchecked exceptions in Java
... inside it. But, and a big one - Never ever obscure in underlying original root cause. For ex, Don't ever do following -
try {
attemptLogin(userCredentials);
} catch (SQLException sqle) {
throw new LoginFailureException("Cannot login!!"); //<-- Eat away original root cause, thus obscu...
Equation for testing if a point is inside a circle
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It may help some less math minded folks to see the square root operation used to measure distance compared against the radius. I realize that's not optimal, but as your answer is formatted more like an equation than code perhaps it makes more sense? Just a suggestion.
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Force point (“.”) as decimal separator in java
...ing.format which lets you specify the locale:
return String.format(Locale.ROOT, "%.2f", someDouble);
If you're only formatting a number - as you are here - then using NumberFormat would probably be more appropriate. But if you need the rest of the formatting capabilities of String.format, this sh...
How can I programmatically create a new cron job?
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The best way if you're running as root, is to drop a file into /etc/cron.d
if you use a package manager to package your software, you can simply lay down files in that directory and they are interpreted as if they were crontabs, but with an extra field for t...
How to retrieve a single file from a specific revision in Git?
...is indeed
git show object
git show $REV:$FILE
git show somebranch:from/the/root/myfile.txt
git show HEAD^^^:test/test.py
The command takes the usual style of revision, meaning you can use any of the following:
branch name (as suggested by ash)
HEAD + x number of ^ characters
The SHA1 hash of a giv...
创业者只需要一种素质：成为某个领域的意见领袖 - 资讯 - 清泛网 - 专注C/C...
...传播
说了这么多推广的重要，那么作为普通创业者应该如何去做？我总不能像老罗一样包下一个剧场去做一个发布会吧。
普通人有普通人的方法，那就是一定要成为“意见领袖”，先看看百度百科上对意见领袖是这么定义的...
Dependent DLL is not getting copied to the build output folder in Visual Studio
...Build errors were that Project A, B, C, Y, and X dlls could not be found.
Root cause was that newly created Project X targeted .NET 4.5 while the rest of the solution projects targeted .NET 4.5.1. Project X didn't build causing the rest of the Projects to not build either.
Make sure any newly add...
Rails.env vs RAILS_ENV
...ewise, you can use RAILS_DEFAULT_LOGGER to get the current logger or RAILS_ROOT to get the path to the root folder.
Starting from Rails 2.x, Rails introduced the Rails module with some special methods:
Rails.root
Rails.env
Rails.logger
This isn't just a cosmetic change. The Rails module offers ...
Heroku push rejected, no Cedar-supported app detected
...to this error message, but my problem was that my rails app was not in the root directory of my git repo. After I moved the files into the root dir, everything worked.
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