Calling to missing super(); ??

i was reading over the code on this link

http://svn.apache.org/viewvc/httpcom...o.java?view=co


and if you look at the constructor its making a call to its super class constructor which i assume is calling the object classes constructor, but whats the point of calling the objects class constructor?

is this common practice?

I think it is a common practice in programming. If we call the parent constructor that mean we want our object initialization to include what the parent does. Then we add a specific constructor code for our new class.