![]() The versions of these dependencies are extracted to the properties section. We’re going to use the Google’s auto-service library to generate processor metadata file which will be discussed later, and the maven-compiler-plugin tuned for the Java 8 source code. The settings for the annotation-processor module are as follows. This is a typical use case of annotation processing. One of them, annotation-processor module, will contain the processor itself together with the annotation, and another, the annotation-user module, will contain the annotated class. We’re going to split our project into two Maven modules. To demonstrate the possibilities of annotation processing, we will develop a simple processor for generating fluent object builders for annotated classes. This class is the one we’re going to extend to create our own annotation processor. The main interface that you’ll have to implement is the Processor interface, which has a partial implementation in the form of AbstractProcessor class. The annotation processing API is located in the package. This process continues until no new files are generated during the processing stage. If any files are generated during this process, another round is started with the generated files as its input. This process continues until no new files are generated during the processing stage.Įach annotation processor, in turn, is called on the corresponding sources. Annotations in Java are used to provide additional information, so it is an alternative option for XML and Java marker interfaces. ![]() attached with class, interface, methods or fields to indicate some additional information which can be used by java compiler and JVM. Each annotation processor, in turn, is called on the corresponding sources. Java Annotation is a tag that represents the metadata i.e. Each round starts with the compiler searching for the annotations in the source files and choosing the annotation processors suited for these annotations. The annotation processing is done in multiple rounds.
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