Why use @PostConstruct?

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  • because when the constructor is called, the bean is not yet initialized – i.e. no dependencies are injected. In the @PostConstruct method the bean is fully initialized and you can use the dependencies.

  • because this is the contract that guarantees that this method will be invoked only once in the bean lifecycle. It may happen (though unlikely) that a bean is instantiated multiple times by the container in its internal working, but it guarantees that @PostConstruct will be invoked only once.

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