#l1 - Libera #java

Bypassing subclass method overrides

Someone in ##java recently asked a question that may come up with beginners to OOP: How to invoke a method of a superclass from the outside. For example, if ChildClass extends BaseClass and overrides BaseClass.method(), how can one invoke the method of the superclass, bypassing the override in ChildClass? This is not a very good idea from an OOP standpoint, because the child class might not expect the parent’s behavior to be invoked...

May 13, 2015 — 4 minute(s) read

#invokespecial-reflection-oop #l1 #polymorphism #reflection

Link: Jenkins over HTTPS with JNLP slaves

A user in ##java recently ran into a problem where he needed to connect Jenkins slaves to a master, using SSL – and it didn’t work, thanks to security. He helpfully wrote up how using correct policy files got it working. Jenkins is a continuous integration server – basically an application that runs your builds when changes occur in your source tree. Slaves allow the build to take place on different hardware configurations, as well as...

Apr 24, 2015 — 1 minute(s) read

#jenkins #l1 #policy #security

Catching (and implementing) exceptions

Introduction In a previous article on Using exceptions correctly, exception propagation was explained: use runtime exceptions for situations in which the code is incorrect, and use checked exceptions for situations for which there is a valid recovery path internal to the application. This article deals with two other things you will have to do with exceptions: catching them and implementing them. And in order to do both, you have to know about exception classes themselves...

Nov 10, 2014 — 6 minute(s) read

#exceptions #l1