History
The Java platform has had various ad-hoc annotation mechanisms—for example, the transient modifier, or the @deprecated javadoc tag. The general purpose annotation (also known as metadata) facility was introduced to the Java Community Process as JSR-175 in 2002 and approved in September 2004. Annotations became available in the language itself beginning with version 1.5 of the JDK. A provisional interface for compile-time annotation processing was provided by the apt tool in JDK version 1.5, and was formalized through JSR-269 and integrated into the javac compiler in version 1.6.
Read more about this topic: Java Annotation
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