I was told at one point that the joscar login tutorial code didn't work out of the box, but I figured it was something trivial so I didn't really pay much attention.
I realized what the problem was: an API change I made after I wrote the tutorial. It's probably hard to track down why it doesn't work unless you're familiar with the library. I've updated the code in the tutorial, adding an important line that's needed for versions past 0.9.1 (I think that's when it started) involving a FLAP processor. I also added instructions on how to set up logging joscar's internal activity, for debugging.
The updated login tutorial has been posted. It might still not work out of the box (my system is too messed up right now to test it), but it should be at least closer to working.
I was tired of hearing people talk about how slow Java is, so I took some benchmarks of my own that show that in a lot of cases Java is significantly faster than C++. I call it the Java is Faster than C++ and C++ Sucks Unbiased Benchmark.
The benchmark's data really aren't biased, but the comments around it surely are. :)