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Tag Archives: Apache ActiveMQ

Apache ActiveMQ 5.9 released

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The Apache ActiveMQ team has just released the new ActiveMQ 5.9 release. This release is 8 months of hard work since the previous 5.8 release. In this release we have as usual more hardening of the broker, and the recent new protocols such as AMQP and MQTT. Also very interesting is the hardening of the leveldb persistent store, which now ...

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Apache Camel Broker Component for ActiveMQ 5.9

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Embedding Apache Camel inside the ActiveMQ broker provides great flexibility for extending the message broker with the integration power of Camel. Apache Camel routes also benefit in that you can avoid  the serialization and network costs of connecting to ActiveMQ remotely – if you use the activemq component. One of the really great things about Apache ActiveMQ is that it ...

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ActiveMQ Message Priorities: How it works

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There’s usually a steady drip of questions on the mailing list surrounding ActiveMQ’s message-priority support as well as good questions about observed behaviors and “what’s really supported”? I hope to help you understand what happens under the covers and what levels of priority can be supported. The details could get gory for some. If you’re not interested in the details, ...

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ActiveMQ: Understanding Memory Usage

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As indicated by some recent mailing list emails and a lot of info returned from Google, ActiveMQ’s SystemUsage and particularly the MemoryUsage functionality has left some people confused. I’ll try to explain some details around MemoryUsage that might be helpful in understanding how it works. I won’t cover StoreUsage and TempUsage as my colleauges have covered those in some depth. ...

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Guaranteed messaging for topics, the JMS spec, and ActiveMQ

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Recently a customer asked me to look closer at ActiveMQ’s implementation of “persistent” messages, how it applies to topics, and what happens in failover scenarios when there are non-durable subscribers. I had understood that the JMS semantics specify that only durable subscribers to a topic are guaranteed message delivery for a persistent delivery mode, even in the face of message-broker ...

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JMS with ActiveMQ

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JMS with ActiveMQ  JMS short for Java Message Service provides a mechanism for integrating applications in a loosely coupled, flexible manner. JMS delivers data asynchronously across applications on a store and forward basis. Applications communicate through MOM(Message Oriented Middleware) which acts as an intermediary without communicating directly. JMS Architecture Main components of JMS are: JMS Provider: A messaging system that ...

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Managing large deployments of MQ and ESB with Fuse Fabric, Part I

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FuseSource just recently released enterprise versions of their distributions of ActiveMQ and ServiceMix. Some of the top features include incremental patching, custom platform installers, and third party verification. One of the coolest features that comes part of the new enterprise editions is Fuse Fabric and some new tooling that allows you to leverage Fabric to manage your environment. Fabric allows ...

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ActiveMQ Network Connectors

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This post is more for me and any ActiveMQ contributors that may be interested in how the Network Connectors work for ActiveMQ. I recently spent some time looking at the code and thought that it would be good to draw up some quick diagrams to help me remember what I learned and help to identify where to debug in the ...

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Connect Glassfish 3 to external ActiveMQ 5 broker

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Introduction Here at ONVZ we’re using Glassfish 3 as our development and production application server, and we’re quite happy with its performance and stability, as well as the large community surrounding it. I rarely run into a problem that does not have a matching solution on stackoverflow or java.net. As part of our open source strategy we also run a ...

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