小贝子编程

使用with Play框架的JMS/ActiveMQ异常



我正在开发一个消息系统，使用ActiveMQ和Play Framework v2.4.2（Java版本）向最终用户发送电子邮件。我是JMS/ActiveMQ技术的新手。我刚刚在ActiveMQ站点上使用了这个HelloWorld示例作为起点。

我创建了一个测试类，如下所示，以测试使用Play Framework运行ActiveMQ，一切正常：

public class ActiveMQMailApp {
    public static void main(String[] args) throws Exception {
        setup();
        MailConsumer.initService();
        for (int i =0;i<11;i++) MailProducer.sendMail(fakeMail());
    }
    public static void setup(){
        FakeApplication fakeApplication = Helpers.fakeApplication();
        Helpers.start(fakeApplication);
    }
    private static Mail fakeMail() throws InterruptedException {
        Thread.sleep(1000);
        SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd  hh:mm:ss");
        return new Mail( "noreply@abc.com", "receiver@gmail.com", "A Test Email", "<html><body><p>Date: <b> "+sdf.format(new Date())+" </b></p></body></html>");
    }
}

但当我在主应用程序中使用这个确切的代码时，抛出了这个异常：

javax.jms.JMSException: Could not create Transport. Reason: java.lang.RuntimeException: Fatally failed to create SystemUsageorg/apache/activemq/protobuf/BufferInputStream
        at org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:36)
        at org.apache.activemq.ActiveMQConnectionFactory.createTransport(ActiveMQConnectionFactory.java:332)
        at org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:345)
        at org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:303)
        at org.apache.activemq.ActiveMQConnectionFactory.createConnection(ActiveMQConnectionFactory.java:243)
        at ir.iais.salary.services.MailProducer.run(MailProducer.java:35)
Caused by: java.lang.RuntimeException: Fatally failed to create SystemUsageorg/apache/activemq/protobuf/BufferInputStream
        at org.apache.activemq.broker.BrokerService.getSystemUsage(BrokerService.java:1159)
        ... 5 more
Caused by: java.io.IOException: org/apache/activemq/protobuf/BufferInputStream
        at org.apache.activemq.util.IOExceptionSupport.create(IOExceptionSupport.java:39)
        ... 11 more
Caused by: java.lang.NoClassDefFoundError: org/apache/activemq/protobuf/BufferInputStream
        at org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter.<init>(KahaDBPersistenceAdapter.java:65)
        ... 13 more
Caused by: java.lang.ClassNotFoundException: org.apache.activemq.protobuf.BufferInputStream
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

我的MailProducer和MailConsumer类如下：

public class MailProducer implements Runnable{
    public static final String AMQ_MAIL_QUEUE = "MAIL";
    public static final String BROKER_URL = "vm://localhost?broker.useJmx=false&persistent=false";
    private Mail mail;
    public MailProducer(Mail mail) {
        this.mail = mail;
    }
    public static void sendMail(Mail mail){
        Thread brokerThread = new Thread(new MailProducer(mail));
        brokerThread.setDaemon(false);
        brokerThread.start();
    }
    @Override
    public void run() {
        try {
            // Create a ConnectionFactory
            ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(BROKER_URL);
            // Create a Connection
            Connection connection = connectionFactory.createConnection();
            connection.start();
            // Create a Session
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            // Create the destination (Topic or Queue)
            Destination destination = session.createQueue(AMQ_MAIL_QUEUE);
            // Create a MessageProducer from the Session to the Topic or Queue
            MessageProducer producer = session.createProducer(destination);
            producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
            // Create a messages
            TextMessage textMessage = session.createTextMessage(new Gson().toJson(mail));
            // Tell the producer to send the message
            System.out.println("Sent message: "+ new Gson().toJson(mail) + " : " + Thread.currentThread().getName());
            producer.send(textMessage);
            // Clean up
            session.close();
            connection.close();
        }
        catch (Exception e) {
            System.out.println("Caught: " + e);
            e.printStackTrace();
        }
    }
}


public class MailConsumer implements Runnable, ExceptionListener {
    private static final Logger logger = getLogger(MailConsumer.class);
    private static Thread mailConsumerService;
    public static synchronized void initService() {
        MailConsumer mailConsumer = Play.application().injector().instanceOf(MailConsumer.class);
        if (mailConsumerService != null) {
            logger.info("STOPPING MailConsumer thread.");
            mailConsumerService.interrupt();
        }
        logger.info("Starting MailConsumer thread.");
        mailConsumerService = new Thread(mailConsumer);
        mailConsumerService.setDaemon(true);
        mailConsumerService.setName("MailConsumer Service");
        mailConsumerService.start();
        logger.info("MailConsumer thread started.");
    }
    @Inject
    private MailerClient mailerClient;
    @Override
    public void run() {
        try {
            // Create a ConnectionFactory
            ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(MailProducer.BROKER_URL);
            // Create a Connection
            Connection connection = connectionFactory.createConnection();
            connection.start();
            connection.setExceptionListener(this);
            // Create a Session
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            // Create the destination (Topic or Queue)
            Destination destination = session.createQueue(MailProducer.AMQ_MAIL_QUEUE);
            // Create a MessageConsumer from the Session to the Topic or Queue
            MessageConsumer consumer = session.createConsumer(destination);
            while (!Thread.currentThread().isInterrupted()) {
                // Wait for a message
                Message message = consumer.receive();
                if (message instanceof TextMessage) {
                    TextMessage textMessage = (TextMessage) message;
                    String text = textMessage.getText();
                    System.out.println("Received: " + text);
                    Mail mail = new Gson().fromJson(text, Mail.class);
                    Email email = new Email();
                    email.setFrom(mail.getFrom());
                    email.setTo(mail.getTo());
                    email.setSubject(mail.getSubject());
                    email.setBodyHtml(mail.getBodyHtml());
                    System.out.println("sending email...");
                    mailerClient.send(email);
                    System.out.println("email sent!");
                } else {
                    System.out.println("Received: " + message);
                    logger.info("message type: "+message.getClass().getSimpleName());
                }
            }
            logger.info("MailConsumer interrupted.");
            consumer.close();
            session.close();
            connection.close();
        } catch (Exception e) {
            if (e instanceof InterruptedException) {
                logger.info("MailConsumer thread interrupted.");
            } else {
                logger.error(e.getLocalizedMessage(), e);
            }
        }
    }
    public synchronized void onException(JMSException ex) {
        System.out.println("JMS Exception occured.  Shutting down client.");
        logger.error("ErrorCode=" + ex.getErrorCode() + " , " + ex.getMessage(), ex);
    }
}

我在主应用程序中调用MailProducer，如下所示：

public Result sendTestMail(){
    if(!DevStatus.gI().isInDebugMode()) return badRequest("You'r not in Development Env.");
    SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd  hh:mm:ss");
    Mail mail = new Mail("noreply@abc.com", "receiver@gmail.com", "A Test Email", "<html><body><p>Date: <b> " + sdf.format(new Date()) + " </b></p></body></html>");
    MailProducer.sendMail(mail);
    return ok("email sent! "+ sdf.format(new Date()));

问题似乎是org.apache.activemq.protobuf.BufferInputStream不在类路径中。我在build.sbt中添加了"org.apache.activemq.protobuf" % "activemq-protobuf" % "1.1"，但没有任何更改。我还通过向代理URI添加persistent=false禁用了ActiveMQ持久性，但它不起作用。

我能做什么？将带有Play Framework的ActiveMQ用作JMS是否有意义？或者有一些更好的JMS可以与Play Framework一起使用？阿卡呢？！！

编辑：我的ActiveMQ相关deps是：

  "org.apache.activemq" % "activemq-broker" % "5.13.4",
  "org.apache.activemq" % "activemq-client" % "5.13.4",
  "org.apache.activemq" % "activemq-kahadb-store" % "5.13.4",
  "org.apache.activemq.protobuf" % "activemq-protobuf" % "1.1",

编辑2：我用"org.apache.activemq" % "activemq-all" % "5.14.0"替换了上面的依赖项，主应用程序开始工作了！我最初以为这个问题已经解决，并且与ActiveMQ包有关，但我意识到ActiveMQMailApp测试类现在抛出了与上面相同的异常！我在一个新的简单maven项目（不是play框架）中运行了这个测试类，一切都很好！恐怕这个错误稍后还会出现。到底发生了什么？！

将此依赖项添加到pom中。

    <dependency>
        <groupId>org.apache.activemq</groupId>
        <artifactId>activemq-kahadb-store</artifactId>
        <scope>runtime</scope>
    </dependency>

请参阅此问题报告。

如果出现以下错误：

java.io.IOException: org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter
    at org.apache.activemq.util.IOExceptionSupport.create(IOExceptionSupport.java:40) ~[activemq-client-5.15.10.jar:5.15.10]
    at org.apache.activemq.broker.BrokerService.createPersistenceAdapter(BrokerService.java:2507) [activemq-broker-5.15.10.jar:5.15.10]
    at org.apache.activemq.broker.BrokerService.getPersistenceAdapter(BrokerService.java:1267) [activemq-broker-5.15.10.jar:5.15.10]
    at org.apache.activemq.broker.BrokerService.getSystemUsage(BrokerService.java:1179) [activemq-broker-5.15.10.jar:5.15.10]
.... 
java.lang.RuntimeException: Fatally failed to create SystemUsageorg.apache.activemq.store.kahadb.KahaDBPersistenceAdapter
    at org.apache.activemq.broker.BrokerService.getSystemUsage(BrokerService.java:1190) ~[activemq-broker-5.15.10.jar:5.15.10]
    at org.apache.activemq.broker.BrokerService.checkMemorySystemUsageLimits(BrokerService.java:2178) ~[activemq-broker-5.15.10.jar:5.15.10]

您应该将@jumpnett发布的依赖项添加到您的pom 中

<dependency>
   <groupId>org.apache.activemq</groupId>
   <artifactId>activemq-kahadb-store</artifactId>
   <scope>runtime</scope>
</dependency>

这个问题是由于sbt使用ivy作为解析系统而引入的，并且由于某种原因activemq-protobuf决定使用封装类型maven-plugins。

当maven将此类工件解析为jar进行编译时，ivy（或者是因为我不太确定sbt）会将其解析为类型maven-plugins而不是类型jar，因此sbt会忽略此依赖关系，因为此依赖关系中没有jar。

修复它的方法是显式地引入一个jar类型的工件：

libraryDependencies += "org.apache.activemq.protobuf" % "activemq-protobuf" % "1.1" jar()

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