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Should JAVA_HOME point to JDK or JRE?
...
If you're doing any sort of development, or building with Maven or Ant, you need to point to the JDK (Java Development Kit) where utilities such as javac (the Java Compiler) reside. Otherwise, you can point to the JRE (Java Runtime Env...
How to fix the “java.security.cert.CertificateException: No subject alternative names present” error
...leSslVerification() {
try
{
// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return nu...
How to change the href for a hyperlink using jQuery
.../www.codeproject.com/">The CodeProject</a>
...Then you probably don't want to accidentally add href attributes to them. For safety then, we can specify that our selector will only match <a> tags with an existing href attribute:
$("a[href]") //...
Of course, you'll probably have s...
What is the difference between a static and a non-static initialization code block
...ossible to use static keyword to cover a code block within a class which does not belong to any function. For example following code compiles:
...
How to make vim paste from (and copy to) system's clipboard?
...e system's clipboard (:help registers). Depending on your system, they may do different things. For instance, on systems that don't use X11 like OSX or Windows, the "* register is used to read and write to the system clipboard. On X11 systems both registers can be used. See :help x11-selection for m...
What's the difference between the build and create methods in FactoryGirl?
...ries the DB.
To check if a model has an attribute the build() method will do because no DB access is required.
it{Factory.build(:user).should respond_to(:name)}
Update
"There is one exception that build actually 'creates' when you are building associations, i.e your association are no longer in...
What's the Point of Multiple Redis Databases?
...point, this gets messy real quick because you need to monitor all of them, do upgrades/patches, etc. If you don't plan on overloading redis with high I/O, a single instance with a slave is simpler and easier to manage provided it meets your SLA.
...
Fast way to get image dimensions (not filesize)
...l image formats (e.g. PNG, GIF, JPEG; recent versions also PPM, WEBP), and does only read the header.
The identify command (from ImageMagick) prints lots of image information for a wide variety of images. It seems to restrain itself to reading the header portion (see comments). It also has a unified...
What's the difference between emulation and simulation? [duplicate]
...or's display and keys, and when the user clicks on the keys, your programs does what the old calculator did. This is a Simulator
You get a dump of the calculator's firmware, then write a program that loads the firmware and interprets it the same way the microprocessor in the calculator did. This is ...
How to round the minute of a datetime object
...microsecond)
If you want classic rounding to the nearest 10 minute mark, do this:
discard = datetime.timedelta(minutes=tm.minute % 10,
seconds=tm.second,
microseconds=tm.microsecond)
tm -= discard
if discard >= datetime.timedelta(minute...