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The Java platform has various ad-hoc annotation mechanisms—for example, the transient modifier, or the @Deprecated javadoc tag. The Java Specification Request JSR-175 introduced the general-purpose annotation (also known as metadata) facility to the Java Community Process in 2002; it gained approval in September 2004.
Jakarta Annotations (CA; formerly Common Annotations for the Java Platform or JSR 250) is a part of Jakarta EE.Originally created with the objective to develop Java annotations (that is, information about a software program that is not part of the program itself) for common semantic concepts in the Java SE and Java EE platforms that apply across a variety of individual technologies.
An example of a class header block follows: /** * Provides some service * @author Jill Smith <address@example.com> * @version 1.6 * @since 1.2 */ public class Test {} For a method, the first line is a short description of the method.
J. Jakarta EE; Jakarta Servlet; Template:Java; Template talk:Java; Java (programming language) Java annotation; Java API for XML Processing; Java class loader
The @Entity annotation declares that the class represents an entity. @Id declares the attribute which acts as the primary key of the entity. Additional annotations may be used to declare additional metadata (for example changing the default table name in the @Table annotation), or to create associations between entities.
By using meta-data/annotations one can create complex web services utilizing features like conversation, state etc. Since all the metadata/annotations are in one file, it is easier to debug and maintain. Using this approach, any plain Java class can be converted into a web service just by the addition of annotations into the Java source files.
Aspects can be defined using either Java annotations (introduced with Java 5), Java 1.3/1.4 custom doclet or a simple XML definition file. AspectWerkz provides an API to use the very same aspects for proxies, hence providing a transparent experience, allowing a smooth transition for users familiar with proxies.
The phases run sequentially and constitute a cascade of finite state transducers over annotations. The left-hand-side (LHS) of the rules consist of an annotation pattern description. [1] The right-hand-side (RHS) consists of annotation manipulation statements. Annotations matched on the LHS of a rule may be referred to on the RHS by means of ...