ActiveMQ Java STOMP 客户端收到 SocketTimeoutException [英] ActiveMQ Java STOMP client receives SocketTimeoutException

问题描述

在 CentOS 机器上有一个 ActiveMQ 服务器.我可以使用 OpenWire JMS 客户端通过 TCP 和 HTTP 连接和使用消息.但是，当我尝试使用 ActiveMQ 测试 STOMP 客户端时，它会在 connection.receieve;

There is an ActiveMQ server working on CentOS machine. I can connect and consume messages with TCP and HTTP using the OpenWire JMS client. However, When I tried with the ActiveMQ test STOMP client it throws this exception on connection.receieve;

java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
    at java.net.SocketInputStream.read(SocketInputStream.java:171)
    at java.net.SocketInputStream.read(SocketInputStream.java:141)
    at java.net.SocketInputStream.read(SocketInputStream.java:224)
    at java.io.DataInputStream.readByte(DataInputStream.java:265)
    at org.apache.activemq.transport.stomp.StompWireFormat.readHeaderLine(StompWireFormat.java:174)
    at org.apache.activemq.transport.stomp.StompWireFormat.readLine(StompWireFormat.java:167)
    at org.apache.activemq.transport.stomp.StompWireFormat.parseAction(StompWireFormat.java:200)
    at org.apache.activemq.transport.stomp.StompWireFormat.unmarshal(StompWireFormat.java:112)
    at org.apache.activemq.transport.stomp.StompConnection.receive(StompConnection.java:77)
    at tr.com.estherial.stomplistener.StompListener.main(StompListener.java:25)

监听类

import org.apache.activemq.transport.stomp.Stomp;
import org.apache.activemq.transport.stomp.StompConnection;
import org.apache.activemq.transport.stomp.StompFrame;
 
public class StompListener {

    public static void main(String[] args) { 

        StompConnection connection = new StompConnection();
        try {
            connection.open("host", 61613);
            connection.connect("admin", "admin", "test");
            connection.subscribe("TEST_TOPIC", Stomp.Headers.Subscribe.AckModeValues.CLIENT);
            connection.begin("test"); 

            while (true) {
                try {
                    StompFrame message = connection.receive(10000); 
                    System.out.println(String.format("%s - Receiver: received '%s'", new Date(), message.getBody()));
                } catch (SocketTimeoutException e) {
                    // ignore
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

这是activemq.xml中的连接器:

<transportConnectors>
    <transportConnector name="stomp" uri="stomp://localhost:61613"/>
</transportConnectors>

您之前是否遇到过类似的异常?

Did you get similar exception before?

推荐答案

java.net.SocketTimeoutException 当 STOMP 订阅者在指定的超时时间内没有收到任何消息时.一旦客户创建了他的订阅，您需要发送一条消息到该主题.此时客户端应该收到消息并通过您的 System.out.println 打印它.

The java.net.SocketTimeoutException is expected when the STOMP subscriber receives no message within the specified timeout. Once the client creates his subscription you need to send a message to the topic. At that point the client should receive the message and print it via your System.out.println.

此外，在 ActiveMQ 5.x 中，当从 STOMP 客户端订阅目的地时，您需要在目的地名称前加上 /queue/ 或 /topic/ 前缀.您没有在应用程序中执行此操作.尝试使用这个:

Also, in ActiveMQ 5.x when subscribing to a destination from a STOMP client you need to prefix the destination name with either /queue/ or /topic/. You aren't doing this in your application. Try using this:

connection.subscribe("/topic/TEST_TOPIC", Stomp.Headers.Subscribe.AckModeValues.CLIENT);

最后，值得注意的是，您正在使用来自 ActiveMQ 代码库的 test STOMP 客户端.ActiveMQ 的内部测试套件使用此客户端来验证代理实现是否按预期工作.它不适合一般用途.此外，如果您使用的是 Java，则最好使用性能更好、功能更全面的客户端，例如 OpenWire JMS 客户端甚至 Qpid JMS 客户端.

Lastly, it's worth noting that you're using the test STOMP client from the ActiveMQ code-base. This client is used by ActiveMQ's internal test-suite to verify the broker implementation is working as expected. It's not meant for general use. Furthermore, if you're using Java you would be better off using a better performing and more full-featured client like the OpenWire JMS client or even the Qpid JMS client.

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