Java Servlet (Tomcat 9) 中的 WebSocket 没有类路径扫描

Question

我试图在 Java Servlet (Tomcat 9) 中设置 WebSocket 而不进行 class 路径扫描，但我遇到了这个错误：

 javax.websocket.DeploymentException: Multiple Endpoints may not be deployed to the same path [/test/{accountId}] : existing endpoint was [class probotdev.websocket.Test] and new endpoint is [class probotdev.websocket.Test]
    at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:169)
    at org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:232)

这是我的 web.xml:

<web-app version="3.0" metadata-complete="true" ...>
    <absolute-ordering/>
    <listener>
        <listener-class>probotdev.websocket.WebSocket</listener-class>
    </listener>
    ...
</web-app>

和 WebSocket class:

class WebSocket extends ServletContextListener {
    override def contextInitialized(sce: ServletContextEvent): Unit = {
        val container = sce.getServletContext.getAttribute("javax.websocket.server.ServerContainer").asInstanceOf[ServerContainer]

        container.addEndpoint(classOf[Test])
    }
}

最后 Test class:

@ServerEndpoint("/test")
class Test {
    @OnOpen
    def onOpen(session: Session): Unit = {
        println("Bla!")
    }
    ...
}

Answer 1

我的 web.xml 配置为 Tomcat 不扫描 class 路径（对于 servlet 等），但 它仍在扫描 WebSocket 内容.

我的解决方案？只需删除 WebSocket extends ServletContextListener class.

Java Servlet (Tomcat 9) 中的 WebSocket 没有类路径扫描

WebSocket in Java Servlet (Tomcat 9) without classpath scanning

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websocket

java-websocket