by Miško Hevery A great question from the reader… The only thing that does not fully convince me in your articles is usage of Guice. I’m currently unable to see clearly its advantages over plain factories, crafted by hand. Do you recommend using of Guice in every single case? I strongly suspect, there are cases, [...]

by Miško Hevery Shahar asks an excellent question about how to deal with frameworks which we use in our projects, but which were not written with testability in mind. Hi Misko, First I would like to thank you for the “Guide to Writing Testable Code”, which really helped me to think about better ways to [...]

by Miško Hevery I think of bugs as being classified into three fundamental kinds of bugs. Logical: Logical bug is the most common and classical “bug.” This is your “if”s, “loop”s, and other logic in your code. It is by far the most common kind of bug in an application. (Think: it does the wrong [...]

Testability Explorer: Using Byte-Code Analysis to Engineer Lasting Social Changes in an Organization’s Software Development Process. (Or How to Get Developers to Write Testable Code) Presented at 2008 OOPSLA by Miško Hevery a Best Practices Coach @ Google Abstract Testability Explorer is an open-source tool that identifies hard-to-test Java code. Testability Explorer provides a repeatable [...]

by Miško Hevery After reading the article on Singletons (the design anti-pattern) and how they are really global variables and dependency injection suggestion to simply pass in the reference to the singleton in a constructor (instead of looking them up in global state), many people incorrectly concluded that now they will have to pass the [...]

by Miško Hevery Dependency injection asks us to separate the new operators from the application logic. This separation forces your code to have factories which are responsible for wiring your application together. However, better than writing factories,  we want to use automatic dependency injection such as GUICE to do the wiring for us. But can [...]

(the other title: Your Application has a Wiring Problem) In My main() Method Is Better Than Yours we looked into what a main() method should look like. There we introduced a clear separation between (1) the responsibility of constructing the object graph and (2) the responsibility of running the application. The reason that this separation [...]

By Miško Hevery | Republished from alphaITJournal.com In Part I of this series, we took a realistic look at what usually happens when we initiate change.  We also took a look at the initial steps of effective change: defining a metric and getting people to accept it as a goal. In this second and final part, we’ll introduce two [...]

By Miško Hevery People are good at turning concrete examples into generalization. The other way around, it does not work so well. So when I write about general concepts it is hard for people to know how to translate the general concept into concrete code. To remedy this I will try to show few examples [...]

Since I have gotten lots of love/hate mail on the Singletons are Pathological Liars and Where Have All the Singletons Gone I feel obliged to to do some root cause analysis. Lets get the definition right. There is Singleton the design pattern (Notice the capital “S” as in name of something) and there is a [...]