K_v(x)

I have just wasted about three hours of sunday afternoon trying to compute a modified bessel function of second kind of fractional order (also known as hyperbolic Bessel function). I hope that this tiny C++ snippet will be googlable, and it will save a few minutes of someone’s live:

#include <boost/math/special_functions/bessel.hpp>
#include

(…)

double v = 5.0/3.0; /* an order of Bessel function */
double x = 2.5; /* an argument of bessel function */
double r; /* will contain a value */

r = boost::math::cyl_bessel_k(v, x);
std::cout<<r<<std::endl;

Just in case someone is interested what is a modified Bessel function, this is an integral representation of Bessel funtion of order v:

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Journal.IO 1.3 released

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Private fields and methods are not private in groovy

I used to code in Java before I met groovy. Like most of you, groovy attracted me with many enhancements. This was to my surprise to discover that method visibility in groovy is handled different than Java!

Consider this example:

class Person {
private String name
public String surname

private Person() {}

private String signature() { "${name?.substring(0, 1)}. $surname" }

public String toString() { "I am $name $surname" }
}

How is this class interpreted with Java?

  1. Person has private constructor that cannot be accessed
  2. Field "name" is private and cannot be accessed
  3. Method signature() is private and cannot be accessed

Let's see how groovy interpretes Person:

public static void main(String[] args) {
def person = new Person() // constructor is private - compilation error in Java
println(person.toString())

person.@name = 'Mike' // access name field directly - compilation error in Java
println(person.toString())

person.name = 'John' // there is a setter generated by groovy
println(person.toString())

person.@surname = 'Foo' // access surname field directly
println(person.toString())

person.surname = 'Bar' // access auto-generated setter
println(person.toString())

println(person.signature()) // call private method - compilation error in Java
}

I was really astonished by its output:

I am null null
I am Mike null
I am John null
I am John Foo
I am John Bar
J. Bar

As you can see, groovy does not follow visibility directives at all! It treats them as non-existing. Code compiles and executes fine. It's contrary to Java. In Java this code has several errors, pointed out in comments.

I've searched a bit on this topic and it seems that this behaviour is known since version 1.1 and there is a bug report on that: http://jira.codehaus.org/browse/GROOVY-1875. It is not resolved even with groovy 2 release. As Tim Yates mentioned in this Stackoverflow question: "It's not clear if it is a bug or by design". Groovy treats visibility keywords as a hint for a programmer.

I need to keep that lesson in mind next time I want to make some field or method private!

Tomcat: Problemy z requestami zawierającymi polskie znaki diakrytyczne


Jeśli jest problem z pobieraniem plików z polskimi znakami diakrytycznymi, to trzeba dopisać kodowanie do connectora w tomcat/conf/server.xml

URIEncoding="UTF-8"

Typowa konfiguracja connectora będzie wyglądała tak

<Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" URIEncoding="UTF-8" />