Cometd，Jetty:Cometd无法启动，抽象错误：javax.servlet.ServletOutputStream.setWriteListener

我正在尝试运行我们的SpringMVC应用程序，它已经在Jetty9.2上运行了（3.0.9）。目前，它与Tomcat7配合得很好，但我们正在检查Jetty作为其他一些需求的另一个应用程序容器。但是，Cometd不会启动，并抛出一个

500

。以下是我们在后端反复遇到的唯一错误：

2017-09-29 12:48:17.137:WARN:oejs.HttpInput:qtp717356484-66: java.lang.AbstractMethodError: javax.servlet.ServletOutputStream.setWriteListener(Ljavax/servlet/WriteListener;)V

web.xml：

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
 <servlet>
        <servlet-name>cometd</servlet-name>
        <servlet-class>org.cometd.server.CometDServlet</servlet-class>
        <init-param>
            <param-name>maxSessionsPerBrowser</param-name>
            <param-value>10</param-value>
        </init-param>
        <init-param>
            <param-name>allowMultiSessionsNoBrowser</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>timeout</param-name>
            <param-value>60000</param-value>
        </init-param>
        <init-param>
            <param-name>long-polling.jsonp.timeout</param-name>
            <param-value>30000</param-value>
        </init-param>
        <init-param>
            <param-name>long-polling.timeout</param-name>
            <param-value>40000</param-value>
        </init-param>
        <init-param>
            <param-name>interval</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>maxInterval</param-name>
            <param-value>300000</param-value>
        </init-param>
        <init-param>
            <param-name>long-polling.multiSessionInterval</param-name>
            <param-value>2000</param-value>
        </init-param>
        <init-param>
            <param-name>multiFrameInterval</param-name>
            <param-value>1000</param-value>
        </init-param>
        <init-param>
            <param-name>logLevel</param-name>
            <param-value>3</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>


    <servlet-mapping>
        <servlet-name>cometd</servlet-name>
        <url-pattern>/cometd/*</url-pattern>
    </servlet-mapping>


    <filter>
        <filter-name>cross-origin</filter-name>
        <filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
        <async-supported>true</async-supported>

    </filter>
    <filter-mapping>
        <filter-name>cross-origin</filter-name>
        <url-pattern>/cometd/*</url-pattern>
    </filter-mapping>

Comet依赖项：

<!-- Cometd dependencies -->
        <dependency>
            <groupId>org.cometd.java</groupId>
            <artifactId>bayeux-api</artifactId>
            <version>${cometd-version}</version>
        </dependency>
        <dependency>
            <groupId>org.cometd.javascript</groupId>
            <artifactId>cometd-javascript-jquery</artifactId>
            <version>${cometd-version}</version>
            <type>war</type>
        </dependency>
        <dependency>
            <groupId>org.cometd.java</groupId>
            <artifactId>cometd-java-server</artifactId>
            <version>${cometd-version}</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-client</artifactId>
            <version>9.2.9.v20150224</version>
        </dependency>

        <dependency>
            <groupId>org.cometd.java</groupId>
            <artifactId>cometd-java-client</artifactId>
            <version>${cometd-version}</version>
        </dependency>

        <dependency>
            <groupId>org.cometd.java</groupId>
            <artifactId>cometd-java-annotations</artifactId>
            <version>${cometd-version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-servlets -->
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlets</artifactId>
        </dependency>

---

您的

web.xml

声明web应用程序为Servlet 3.1

ServletOutputStream.setWriteListener（WriteListener）

是一个已添加到Servlet3.1的方法

您得到的错误是：

java.lang.AbstractMethodError: javax.servlet.ServletOutputStream.setWriteListener(Ljavax/servlet/WriteListener;)V

表示您已经针对Servlet3.1JAR编译了应用程序，但是您正在一个不提供这种jar的环境中运行它，可能只是Servlet3.0JAR

Jetty 9.2.x开箱即用，支持Servlet3.1

我怀疑您有一个错误的类路径，在这个类路径中，您引用了导致该错误的旧jar，所以我会先仔细检查一下

---

如果要在独立Jetty 9.2.x服务器中部署web应用程序，请确保web应用程序的

web-INF/lib

中的JAR正确。

这有帮助，但调用侦听器时没有经过身份验证的用户。你能检查一下下面的问题吗。谢谢

@Component
public class BayeuxInitializer implements DestructionAwareBeanPostProcessor, ServletContextAware {
    private BayeuxServer bayeuxServer;
    private ServerAnnotationProcessor processor;

    @Inject
    private void setBayeuxServer(BayeuxServer bayeuxServer) {
        this.bayeuxServer = bayeuxServer;
    }

    @PostConstruct
    private void init(){

        this.processor = new ServerAnnotationProcessor(bayeuxServer);
    }

    @PreDestroy
    private void destroy() {
    }

    public Object postProcessBeforeInitialization(Object bean, String name) throws BeansException {
        processor.processDependencies(bean);
        processor.processConfigurations(bean);
        processor.processCallbacks(bean);

        return bean;
    }

    public Object postProcessAfterInitialization(Object bean, String name) throws BeansException {
        return bean;
    }

    public void postProcessBeforeDestruction(Object bean, String name) throws BeansException {
        processor.deprocessCallbacks(bean);
    }

    @Bean(initMethod = "start", destroyMethod = "stop")
    public BayeuxServer bayeuxServer() {

        return new BayeuxServerImpl();
    }

    public void setServletContext(ServletContext servletContext) {
        servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bayeuxServer);
    }
}



 @Listener(value = "/service/online")
    public void OnlineNotifications(ServerSession remote, ServerMessage.Mutable message) {
        Person person = this.personService.getCurrentlyAuthenticatedUser();

// This person is always null in Jetty, but not on Apache tomcat.
}

java.lang.AbstractMethodError: javax.servlet.ServletOutputStream.setWriteListener(Ljavax/servlet/WriteListener;)V