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Which one is better configuring your application using XML, or Annotations?

Anjali Sharma answered on January 3, 2023 Popularity 1/10 Helpfulness 1/10

answer Which one is better configuring your application using XML, or Annotations?

Which one is better configuring your application using XML, or Annotations?

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About XML configuration (which we are using up to now), we decided to keep it for dependencies defined by libraries (regardless if being developed by us, or by third parties).
Libraries, by definition, provide a particular functionality and can be used in various scenarios, not necessarily involving DI. 
Therefore, using annotations in the library projects we develop ourselves, would create a dependency of the DI framework (Spring in our case) to the library, making the library unusable in non-DI context.
Having extra dependencies is not considered a good practice among our team (an in general IMHO).

When we are assembling an application, the application context would define the necessary dependencies. 
This will simplify dependency tracking as the application becomes the central unit of combining all the referenced components, and usually this is indeed where all the wiring up should happen.

XML is also good for us when providing mock implementations for many components, without recompiling the application modules that will use them. 
This gives us flexibility when testing running in local or production environment.

In regards to annotations, we decided that we can benefit using them when the injected components will not vary -- for instance only a certain implementation for a component will be used troughout the application.

The annotations will be very useful for small components/applications that will not change or support different implementations of a dependency at once, and that are unlikely to be composed in a different way (for instance using different dependencies for different builds). 
Simple micro-services would fit in this category.

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Contributed on Jan 03 2023

Anjali Sharma

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Which one is better configuring your application using XML, or Annotations?

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