For what exactly @XXXXX is used for?

Question

Beginner's question. I see a lot of @XXXXX s in our code base. So I would like to know what is the significance of this syntax. Below is a snippet of our code and example

@Process     
public Message loadManifest(Message message) {

How can we relate this to JBoss AS Pipeline?

take a look https://docs.oracle.com/javase/tutorial/java/annotations/ — Federico Sierra, May 07 '15 at 17:03
@gubblebozer : My question is also in relation with the RHEL JBoss, how can it fit in there to the pipeline, will edit the question now. — , May 07 '15 at 17:23

score 0 · Accepted Answer · answered May 07 '15 at 17:03

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This is an annotation. It's uses vary from preventing warnings during compilation (like @SuppressWarnings), to automation of creating servlet mappings. This link may clarify the concept a bit more.

In case of your particular example, my bet is it's this one

answered May 07 '15 at 17:03

CptBartender

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This actually is Jboss snippet which I have as an example. Thanks your answer is informative. – May 07 '15 at 17:41

score 0 · Answer 2 · answered May 07 '15 at 17:04

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They are most likely custom Java Annotation.

answered May 07 '15 at 17:04

Martin

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score 0 · Answer 3 · answered May 07 '15 at 17:06

@Process is called an annotation. A big part of java is reflection, which is the ability for a class to see the methods and fields of other classes. It is very nice and it has created a lot awesome libraries.

Annotations are accessible through reflection.

score 0 · Answer 4 · answered May 07 '15 at 17:07

@ tags are Annotations

As per Sun, Oracle: Annotations, a form of metadata, provide data about a program that is not part of the program itself. Annotations have no direct effect on the operation of the code they annotate.

Annotations have a number of uses, among them:

Information for the compiler — Annotations can be used by the compiler to detect errors or suppress warnings.
Compile-time and deployment-time processing — Software tools can process annotation information to generate code, XML files, and so forth.
Runtime processing — Some annotations are available to be examined at runtime.

Annotations - Oracle reference

For what exactly @XXXXX is used for?

4 Answers4