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This paper describes a new modelling language for the effective design andvalidation of Java annotations. Since their inclusion in the 5th edition ofJava, annotations have grown from a useful tool for the addition of meta-datato play a central role in many popular software projects. Usually they are notconceived in isolation, but in groups, with dependency and integrityconstraints between them. However, the native support provided by Java forexpressing this design is very limited.  To overcome its deficiencies and make explicit the rich conceptual modelwhich lies behind a set of annotations, we propose a domain-specific modellinglanguage. The proposal has been implemented as an Eclipse plug-in, including aneditor and an integrated code generator that synthesises annotation processors.The environment also integrates a model finder, able to detect unsatisfiableconstraints between different annotations, and to provide examples of correctannotation usages for validation. The language has been tested using a real setof annotations from the Java Persistence API (JPA). Within this subset we havefound enough rich semantics expressible with Ann and omitted nowadays by theJava language, which shows the benefits of Ann in a relevant field ofapplication.

Ann: A domain-specific language for the effective design and validation of Java annotations