java - How to write business objects with uses Bean Validation in JavaEE? -

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i'm learning bean validation , in books recommended business objects should use bean validation , validation should count other layers in classic mutlitiered javaee application. means bean validation should implemented once. how should manage that?

lets have following layers in java application:

jsf-ui->controller->dto->ejb/cdi (with business objects)->dao->database

how controller in frontend should know validation occurs in logic layer in business objects?


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