“boilerplate code” is any seemingly repetitive code that shows up again and again in order to get some result that seems like it ought to be much simpler. It’s a subjective definition. The term comes from “boilerplate” in the newspaper industry: wiki
You get this error because a class which has no constructor has a default constructor, which is argument-less and is equivalent to the following code: public ACSubClass() { super(); } However since your BaseClass declares a constructor (and therefore doesn’t have the default, no-arg constructor that the compiler would otherwise provide) this is illegal – … Read more