Java类的消息正文编写器...和未找到 MIME 媒体类型文本/html

json java glassfish jersey atmosphere

2022-09-03 15:44:09

我正在使用jms/atmosphere框架在两个应用程序之间进行通信。其中一个应用程序是主题的消息创建器，发送以下类型的自定义对象：

    @XmlRootElement
    public class A implements Serializable{
    public A(){}

    /* some private properties */

   }

另一方面，多个消费者正在收听该主题，并根据ID进行不同的订阅。

    @GET
    @Produces({MediaType.APPLICATION_JSON})
    public SuspendResponse<A> subscribe() {
    return new SuspendResponse.SuspendResponseBuilder<A>()
            .broadcaster(topic)
            .outputComments(true)
            .addListener(new EventsLogger()).build();
    } 
   @Override
public void incomingBroadcast() {
    try {
        String id = getID();
        if (id.startsWith("/*")) {
            id = "atmosphere";
        }

        logger.info("Looking up Connection Factory {}", FACTORY_NAME);
        Context ctx = new InitialContext();
        ConnectionFactory connectionFactory = (ConnectionFactory) ctx.lookup(FACTORY_NAME);

        logger.info("Looking up topic: {}", TOPIC_NAME);
        Topic topic = (Topic) ctx.lookup(TOPIC_NAME);

        connection = connectionFactory.createConnection();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        logger.info("Create consumer for : {}", id);
        String selector = String.format("BroadcasterId = '%s'", id);

        consumer = session.createConsumer(topic, selector);
        consumer.setMessageListener(new MessageListener() {

            @Override
            public void onMessage(Message msg) {
                try {
                    ObjectMessage om = (ObjectMessage) msg;
                    A a = (A) om.getObject();
                    if (a!= null && bc != null) {
                        broadcastReceivedMessage(a);
                    }
                    logger.info("Broadcasted message: {} ", a);
                } catch (JMSException ex) {
                    logger.warn("Failed to broadcast message", ex);
                }
            }
        });
        publisher = session.createProducer(topic);
        connection.start();
        logger.info("JMS created for topic {}, with filter {}", TOPIC_NAME, selector);
    } catch (Throwable ex) {
        throw new IllegalStateException("Unable to initialize MyBroadcaster", ex);
    }

}

我注意到消息在JMS主题上正确到达，但我收到以下异常：

   SEVERE: A message body writer for Java class A, and Java type class A, and MIME       
   media type text/html was not found

   SEVERE: The registered message body writers compatible with the MIME media type are:

   */* ->
   com.sun.jersey.core.impl.provider.entity.FormProvider
   com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider
   com.sun.jersey.core.impl.provider.entity.StringProvider
   com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
   com.sun.jersey.core.impl.provider.entity.FileProvider
   com.sun.jersey.core.impl.provider.entity.InputStreamProvider
   com.sun.jersey.core.impl.provider.entity.DataSourceProvider
   com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
   com.sun.jersey.core.impl.provider.entity.ReaderProvider
   com.sun.jersey.core.impl.provider.entity.DocumentProvider
   com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider
   com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter
   com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
   com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General
   com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General
   com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider
   com.sun.jersey.server.impl.template.ViewableMessageBodyWriter
   com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
   com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
   com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
   com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
   com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy
   com.sun.jersey.moxy.MoxyMessageBodyWorker
   com.sun.jersey.moxy.MoxyListMessageBodyWorker

我使用的是Netbeans 7.0.1，glassfish 3.1.1，atmosphere 0.8.1，球衣1.11。我在网上搜索了一下，尝试了任何可能的解决方案，但没有任何帮助。

答案 1

我遇到了同样的问题，这归因于我的类路径中没有包含泽西岛的json模块。您可以通过在maven上添加以下依赖项来简单地修复它

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>1.14</version>
</dependency>

答案 2

看来你需要为通过泽西岛运输的类实现所需的MessageBodyWriter。

您可以将@Provider附加到类 A，并使其实现 MessageBodyWriter，例如：

@Provider公共类 A 实现 MessageBodyWriter

这将强制您重写所需的方法（writeTo，getSize，isWriteable），同时在方法中传输对象。