Java 8 introduced JSR-308, which added new annotation capabilities to the Java language. Most importantly: Type annotations. It is now possible to design monsters like the below: https://twitter.com/lukaseder/status/711612663202238464 The code displayed in that tweet really compiles. Every type can be annotated now, in order to enhance the type system in any custom way. Why, you … Continue reading JSR-308 and the Checker Framework Add Even More Typesafety to jOOQ 3.9
Tag: annotations
Use JUnit’s expected exceptions sparingly
Sometimes, when we get pull requests for jOOQ or our other libraries, people change the code in our unit tests to be more "idiomatic JUnit". In particular, this means that they tend to change this (admittedly not so pretty code): @Test public void testValueOfIntInvalid() { try { ubyte((UByte.MIN_VALUE) - 1); fail(); } catch (NumberFormatException e) … Continue reading Use JUnit’s expected exceptions sparingly
Subtle Changes in Java 8: Repeatable Annotations
Apart from the "big stuff", related to extension methods, lambda, and the streams API, Java 8 also has a couple of minor, very subtle changes. One of them is the fact that you can now annotate an object several times with the same annotation! An example taken from the tutorial: @Alert(role="Manager") @Alert(role="Administrator") public class UnauthorizedAccessException … Continue reading Subtle Changes in Java 8: Repeatable Annotations