Thursday, 23 May 2013

Calling methods from Constructors, a definitive explanation by Dr Heinz M. Kabutz

I am a huge fan of Dr. Kabutz and have been following his Java Specialists newsletter for many years.

In the latest issue he explains and demonstrates the pitfalls of calling methods from within constructors.

Now I have always been a proponent of "don't put logic other than simple initialisation in constructors", in fact I have always introduced this as a "Golden Rule" when helping other developers.
I knew about most of the things that Dr. Kabutz explains here but never really found the time to really get into it and write things down. Now that Dr. Kabutz has done so I don't need to.

The majority of my work involves JSF/CDI/EJB/JPA. I still see many code examples which places significant code in the constructors of CDI Beans even from sources that claim to know better.
If you are in the habit of doing so you really need to read the newsletter and get into the habit of using @PostConstruct annotations in your code as well as adding lazy loading/evaluation to setter/getter methods.

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