Jakarta Bean Validation is a specification which
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lets you express constraints on object models via annotations
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lets you write custom constraints in an extensible way
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provides the APIs to validate objects and object graphs
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provides the APIs to validate parameters and return values of methods and constructors
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reports the set of violations (localized)
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runs on Java and is integrated in Jakarta EE (but does not require it): Jakarta Bean Validation 3.0 is part of Jakarta EE 9 and 10.
While you can run validation manually, it is more natural to let other specifications and frameworks validate data at the right time (user input in presentation frameworks, business service execution by CDI, entity insert or update by JPA).
In other words, run once, constrain anywhere.
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