jms

问题 I am trying to send messages to my default queue in wildfly and when i invoke "sendMessage()" the JMSContext is giving me a null pointer exception. what can i fix ? public class SendMsg { @Resource(lookup = "java:/ConnectionFactory") ConnectionFactory connectionFactory; JMSContext context=connectionFactory.createContext(); @Resource(mappedName="java:/jms/queue/test") Queue queue; public void sendMessage(String message) { System.out.println("fancy beans"); context.createProducer().send(queue,

问题 Please see this question first. How can I access that custom header property value from "queue2"?outside of that route builder method or class. I am using something like shown below. I dont find any methods in consumerTemplate API to get custom header properties. ConsumerTemplate consumerTemplate = camelContext.createConsumerTemplate(); textMessage = consumerTemplate.receiveBody("activemq:queue2",10000,String.class); that question is to set header using camel route. but this question about

问题 I have a application that uses JMS as messaging system. If publisher, subscriber and weblogic server is on Linux , publish rate is good enough(>30 messages/second). But if all the three are on SunOS , publish rate comes down to 2-3 messages/second . I tried to search internet but had no luck. Is there any know issue about that? What can be the reason of this strange behavior. 回答1: I found where the issue was in logs : Unable to load performance pack. Using Java I/O instead. Please ensure that

问题 here is a simplified / schematic topology we set up [Front server 1 (message producer)] [Front server n (message producer)] | | |________________ ________________| | | [Messaging Server (HornetQ)] | | ________________| |________________ | | [Task server 1 (Message Driven Bean)] [Task server n (MDB)] Each node (server) is a standalone (no cluster) jboss application server (Jboss-as7) including the messaging one. The messaging server deploys many JMS queues. Each Task server deploys a MDB per

问题 I am trying to understand concepts related to MDB, MQ, JMS. I did research on SO before asking this question. Is this possible scenario: MDB deployed on Application Server, say on JBOSS (on physical Server-A). MQ (say ApacheMQ) on a difference physical server-B. So can the MDB deployed in physical server-A get messages from physical server-B? If this is possible, then does MDB use JMS API's? I have heard Jboss has MQ, which i presume MQ withing Jboss application server; however i want MDB in

问题 Will message selectors work with receiveNowait() method too for synchronous process. it works with receive() method but wanted to know for receiveNoWait for IBM mq. Message selector is added while creating consumer. EDIT 1: I have tested with receiveNowait() method, and the selector is not working. I don't know the problem is with my selector or the receivenowait method. following is the selector I have used: String messageSelector = "JMSTimestamp <= " + System.currentTimeMillis() - 180000;

问题 I am using IBM MQ and Java to write a message as Bytes on to the queue. Problem here i am getting here is while reading this message from JMS client offcourse that is expected format,i am getting as "BytesMessage" instead of message in MQSTR format. What properties i have to set while writing the message on to the queue ,so JMS client consume that message as Text instead of Byte? Do i need to chnage any of the below properties or anything else? openOptions =MQC.MQOO_OUTPUT putOptions=MQC

问题 Is there a way to use a property read from a config file to fill propertyValue in JMS selector? As an example I have: @ActivationConfigProperty(propertyName = "messageSelector", propertyValue = JMSSelector.ITEM_SELECTOR) Where JMSSelector.ITEM_SELECTOR is a String defined as: public static final String ITEM_SELECTOR = "type = 'S_TYPE' OR type = 'M_TYPE'" Let's say that I have another new type other than "S_TYPE" and "M_TYPE", and I have it in a config file MYTYPES = S_TYPE,M_TYPE,G_TYPE Is

问题 I am using ActiveMQ Artemis and JMS 2.0 for reading topic messages with shared consumers. I have two questions: Is there any way to use configuration with xml format. When I set the message listener on the consumer is it mandatory to use a while loop? If I don't use while (true) loop the program will terminate when topic has no messages. SharedConsumer.java public class SharedConsumer { @Resource(lookup = "java:comp/DefaultJMSConnectionFactory") ConnectionFactory connectionFactory; public

问题 I want to count the messages in the queue. InitialContext ctx = initQueue(); connFactory = (QueueConnectionFactory) ctx.lookup(CF_NAME); queueConnection = connFactory.createQueueConnection(); queueConnection.start(); queueSession = queueConnection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE); queue = (Queue) ctx.lookup(queueName); QueueBrowser queueBrowser = queueSession.createBrowser(queue); But here it stops ------->QueueBrowser queueBrowser = queueSession.createBrowser(queue)