Scala是否支持JSR-303验证?

好消息和坏消息.

好消息是，您可以毫无问题地在Scala代码中使用JSR-303批注.

The good news is that you can use JSR-303 annotations in your Scala code with no problems.

这是我以前的项目中的一个示例，其中所有注释都是JSR-303注释，其中一些是开箱即用的，其中一些是自定义的.

Here is an example from a previous project of mine, where all of the annotations are JSR-303 annotations, some of them out of the box, some of them custom.

@MessagesValid
class Messages {
  @NotEmpty @Valid
  private var msgs: java.util.List[DeliveredMessage] = _  
  def messages = msgs.asScala

  @ChannelValid 
  var channel: String = _

  var emailFrom: String = _
  var emailReplyTo: String = _

  @PublishAtValid
  var publishAt: String = _
}

请注意msgs集合是java.util.List的方式.它必须是Java集合，@NotEmpty和@Valid才能正常工作.但是使用JavaConverters将该字段公开为Scala集合很容易.

Note how the msgs collection is a java.util.List. It needs to be a Java collection for the @NotEmpty and @Valid to work. But it's easy enough to expose that field as a Scala collection using JavaConverters.

坏消息是您不能使用Scala创建JSR-303批注.您必须使用Java编写这些注释.因此，如果要编写自定义JSR-303批注，则需要混合使用Scala/Java项目.

The bad news is that you cannot create a JSR-303 annotation using Scala. You must write those annotations using Java. So you will need to have a mixed Scala/Java project if you want to write custom JSR-303 annotations.

Scala中有一个旧错误(错误#32！)错误跟踪器以支持这些类型的注释，但由于无法修复，因此目前已关闭.请继续投票.

There is an old bug (bug #32!) in the Scala bug tracker to support these types of annotations but it is currently closed as Won't Fix. Please vote for it anyway.