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Since [[JDK]] 1.6, its [[JavaC]] comes with standardized [[API]] for compile time processing of [[Annotations]]. Just by writing and registering a {{JDK|javax/annotation/processing|Processor}} in a [[JAR]] file of the [[API]] containing also the [[Annotations]], one can effectively extend the compile time semantics of the [[Java]] language. By hooking into the compilation process of everyone using the [[JAR]] library, one can analyse all the [[Annotations]] usages, process them and generate additional files that can be then consumed during runtime.

[[NetBeans]] uses this style to convert nicely looking [[Annotations]] into a bit messy, yet powerful, [[NetBeansLayers|layer XML file systems]]. This feature is available since version 6.7 [[TheYearOfAnnotations2009|released in 2009]]. Get more details about [[CompileTimeCache]]s!

Where is the limit? As [[LiveDB]] essay shows, there is none - download your database schema and include it as [[LiveDB|metadata of your compilation]!

There are very interesting aspects for [[BackwardCompatibility]]. By having own processor code running during compilation, one can keep own annotation unchanged across multiple releases, yet each of the new releases can generate something different during the compilation. As a result, one can deliver performance improvements, or even slightly shift mean of the [[API]] just by letting people compile their applications against new version of own libraries.

==== [[TheYearOfAnnotations2009|2009 - the Year of Annotations]]!? ====

{{:TheYearOfAnnotations2009}}

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