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Explain about JMS queue?
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What are the different elements present in JMS?
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What is JMS ?
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What is JMS session ?
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What is JMS provider ?
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What is JMS administered object ?
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Can two different JMS services talk to each other? For instance, if A and B are two different JMS providers, can Provider A send messages directly to Provider B? If not, then can a subscriber to Provider A act as a publisher to Provider B?
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According to Section 3.4 of the JMS Specification, a client can effectively set only three of the message header fields. All the others are set either by the JMS provider or by the send or publish method. Why do all the fields have a setter method, when any client setting will be overridden when the message is sent or when the JMS provider delivers it? Wouldn't it make sense to allow only getter methods for most of the fields?
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A: The JMS specification does not specify exactly what exceptions are delivered to an ExceptionListener or when they are delivered, so providers vary in how they handle connection problems. Check with your JMS provider if you have questions.
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According to the specification, "Getting a property value for a name which has not been set is handled as if the the property exists with a null value." In the case of getStringProperty, does this mean a null value or a null string?
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Why can't I run the JMS API sample programs using the J2EE 1.2.x SDK?
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What is the recoverability of messages for closed consumers?
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How does CLIENT_ACKNOWLEDGE mode work when there are two or more TopicSubscribers to the same topic within a session?
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What message distribution policy does the JMS API specify when there are two or more QueueReceivers for the same queue at the same time?
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Can a message be acknowledged after its message consumer is closed?
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Why doesn't the JMS API provide subscription notification? If it were possible for a publisher to detect when subscribers for a topic existed, it could inhibit publication on unsubscribed topics.
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Why doesn't the JMS API provide a send-to-list mechanism?
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Why doesn't the JMS API provide end-to-end synchronous message delivery and notification of delivery?
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How is the JMS API aligned with the CORBA Notification Service?
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Why doesn't the JMS API specify a set of JavaBeans components?
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