Hibernate Validator @NotNull 总是先触发吗？
Is Hibernate Validator @NotNull always triggered first?
换句话说，如果我有两个约束，例如 @Email 和 @NotNull，@Email 验证器不会抛出 NPE？
这似乎很明显，但我问是因为我看到一些自定义验证器会检查要验证的值是否为空，如果是 return 则为真。这似乎是个坏主意，因为如果开发人员忘记将 @NotNull 添加到 email 字段，那么电子邮件字段仍将通过验证。
TIA，
奥莱
为 null 返回 true 被认为是 Bean 中的最佳实践
验证和所有内置约束都遵守它（如果可能）。
Bean 验证规范在 3.4. Constraint validation implementation 部分中说：
While not mandatory, it is considered a good practice to split the
core constraint validation from the not null constraint validation
(for example, an @Email constraint will return true on a null object,
i.e. will not take care of the @NotNull validation).
null can have multiple meanings but is commonly used to express that a
value does not make sense, is not available or is simply unknown.
Those constraints on the value are orthogonal in most cases to other
constraints. For example a String, if present, must be an email but
can be null. Separating both concerns is a good practice.
换句话说，如果我有两个约束，例如 @Email 和 @NotNull，@Email 验证器不会抛出 NPE？
这似乎很明显，但我问是因为我看到一些自定义验证器会检查要验证的值是否为空，如果是 return 则为真。这似乎是个坏主意，因为如果开发人员忘记将 @NotNull 添加到 email 字段，那么电子邮件字段仍将通过验证。
TIA， 奥莱
为 null 返回 true 被认为是 Bean 中的最佳实践
验证和所有内置约束都遵守它（如果可能）。
Bean 验证规范在 3.4. Constraint validation implementation 部分中说：
While not mandatory, it is considered a good practice to split the core constraint validation from the not null constraint validation (for example, an @Email constraint will return true on a null object, i.e. will not take care of the @NotNull validation).
null can have multiple meanings but is commonly used to express that a value does not make sense, is not available or is simply unknown. Those constraints on the value are orthogonal in most cases to other constraints. For example a String, if present, must be an email but can be null. Separating both concerns is a good practice.