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I having hard time understanding importance and benefits of Annotations and so have two questions regarding them:
Would appreciate pros and cons comparison with XML Configuration with example so that it would be much more helpful for me to understand.
Regards.
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An annotation is a construct associated with Java source code elements such as classes, methods, and variables. Annotations provide information to a program at compile time or at runtime based on which the program can take further action.
Spring Boot Annotations is a form of metadata that provides data about a program. In other words, annotations are used to provide supplemental information about a program. It is not a part of the application that we develop. It does not have a direct effect on the operation of the code they annotate.
Java annotations are metadata (data about data) for our program source code. They provide additional information about the program to the compiler but are not part of the program itself. These annotations do not affect the execution of the compiled program. Annotations start with @ .
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.
For your 1st question,
Personally, I feel, there are two criteria's
If annotations do not reduce the amount of metadata that you have to provide (in most cases they do), then you shouldn’t use annotation.
Can changes to the metadata break behavior in your application?
If not, then you can feel comfortable applying the change while the system is running in production. External config files are the best place for the metadata in this case because you don’t want to have to recompile your code to make the change.
For your 2nd question,
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