SparkJava使用Kotlin和WebSockets(SparkJava using Kotlin and WebSockets)

 我正在使用SparkJava尝试Kotlin，并且无法实现WebSockets路由。 我试图遵循SparkJava网站（ http://sparkjava.com/tutorials/websocket-chat ）上提供的WebSockets示例，虽然我可以使OnWebSocketConnect和OnWebSocketMessage元素工作，但是没有拾取OnWebSocketClose。 
 
 我已经用Java实现了这个，以便仔细检查它是不是浏览器问题，并且Java实现工作得很好......所以这似乎是Kotlin解释OnWebSocketClose注释的方式所特有的。 
 
 我的代码如下所示 
 
import spark.Spark.*
import org.eclipse.jetty.websocket.api.Session
import org.eclipse.jetty.websocket.api.annotations.*;

fun main(args: Array<String>) {
    staticFileLocation("/public")
    webSocket("/chat", WSHandler::class.java)
    init()
}

@WebSocket
class WSHandler {

    @OnWebSocketConnect
    fun connected(session: Session) = println("session connected")

    @OnWebSocketClose
    fun closed(session: Session, statusCode: Int, reason: String) = println("closed sessions")

    @OnWebSocketMessage
    fun message(session: Session, message: String) = println("Got: $message")
}
 
 html / javascript等符合SparkJava网站上的教程。 

I am trying out Kotlin with SparkJava, and having trouble implementing the WebSockets routes. I am trying to follow the WebSockets example available on the SparkJava website (http://sparkjava.com/tutorials/websocket-chat), and whilst I can get the OnWebSocketConnect and OnWebSocketMessage elements to work, the OnWebSocketClose is not picked up.
 
I have implemented this in Java to double check that it is not a browser issues, and the Java implementation works fine...so this appears to be something specific to the way Kotlin is interpreting the OnWebSocketClose annotation.
 
My code looks like the following
 
import spark.Spark.*
import org.eclipse.jetty.websocket.api.Session
import org.eclipse.jetty.websocket.api.annotations.*;

fun main(args: Array<String>) {
    staticFileLocation("/public")
    webSocket("/chat", WSHandler::class.java)
    init()
}

@WebSocket
class WSHandler {

    @OnWebSocketConnect
    fun connected(session: Session) = println("session connected")

    @OnWebSocketClose
    fun closed(session: Session, statusCode: Int, reason: String) = println("closed sessions")

    @OnWebSocketMessage
    fun message(session: Session, message: String) = println("Got: $message")
}
 
The html / javascript etc are as per the tutorial on the SparkJava website. 

原文：https://stackoverflow.com/questions/44662272