Runtime (where data is retained always and accessible through reflection),.There are three different types of retention policy: The retention policy, which is an important part of implementing Annotations, is based on how long the data needs to be kept in memory. Annotations can be applied at package level or on a class member (field, method, constructor) or even a method local parameter. He mentioned that JSR-175 was formed to provide a metadata facility for the Java language and in Java 5, Annotations were added to the language.ĭefining Annotations is similar to defining the Interfaces (Annotations are declared using type). In the presentation, John gave a walk-through of byte-code and meta programming techniques and an overview of how metadata in Java applications has been managed from the earlier versions of Java, using Properties files, XML, and now Annotations.
#Java annotations best practices software#
John Heintz from New Aspects did a presentation at the recent No Fluff Just Stuff ( NFJS) Central Ohio Software Symposium ( COSS) on different design techniques for adding behavior to Java custom Annotations. But the developers need to follow some guidelines and best practices to identify the areas in the application where using Annotations is a better design solution than other options such as in-line code or using an Interface. Custom annotations are a great way to add common reusable behavior to Java applications.
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