java - Get an illegal blocksizeexception: data cannot exceed 256 bytes when using RSA

I am using rsa key to encrypt a long string which I will send to my server(will encrypt it with server's public key and my private key) But it throws an exception like javax.cr...

objective c - How do I choose to go back to the loaded uiviewcontroller?

I have a view on a storyboard the has a button to perform a certain action. To perform this action though, the user must be logged in. The button handler tests if the user is l...

html - CSS: background color only in the bottom

I have searched for an answer but couldn't find it anywhere. My question is reasonably simple: I have a background color of my body, then a large margin, and now I want a diffe...

java - How to make ant lengthy?

Trying to build my project with ANT in idea 10 and I get a compile error but I don't see the actual error. How do I make ANT verbose? All I see is: javac build.xml:303: Comp...

python - Preserving naive Bayesian training classifier in nltk

I'm slightly confused in regard to how I save a trained classifier. As in, re-training a classifier each time I want to use it is obviously really bad and slow, how do I save i...

javascript - How to change the color of high level chart?

I'm using highcharts to make a piechart but I'm having trouble loading a custom color set for my chart. Here is my code: <script type="text/javascript"> $(funct...

How to apply opacity without affecting the child elements of HTML / CSS?

I want to achieve this using html and css: I have tried to set the opacity of the container to 0.3 and the box to 1, but it doesn't work: both divs have 0.3 opacity. jsFidd...

ruby on rails - How to check the database name used by activerecord

In database.yml you define all the settings. How can I access those settings from ruby? I've looked in App::Application::config, but can't find it there. Also, I remember peopl...

wpf - Xaml or C code hiding

I don't like to use XAML. I prefer to code everything in C#, but I think that I am doing things wrong. In which cases it is better to use XAML and when do you use C#? What is ...

mysql - Error: unable to generate gem native extension (mysql2 on rails 3.2.3)

I'm trying to install the mysql2 gem with Rails 3.2.3 and it's failing: ★ bundle install Fetching gem metadata from https://rubygems.org/......... Using rake (0.9.2.2) Using...