How to implement org.springframework.validation.Validator correctly?

Question

I have seen the following validations are done in Spring Boot. I just wanted to validate some validation logic before saving the data to Database. So can anybody give me an example of how to do this properly? I just wanted to throw exceptions if the logic is failed. Is this achievable using this org.springframework.validation.Validator?

import org.springframework.validation.Validator;

public class CustomValidator implements Validator {

@Autowired
private SpringValidatorAdapter validator;

    public boolean supports(Class<?> clazz) {
        return Custom.class.equals(clazz);
    }

    public void validate(Object o, Errors e) {
        validator.validate(o, e);
    }
}