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Tag Archives: JMS

Working with large messages using Apache Camel and ActiveMQ Artemis improved in upcoming Camel 2.21 release

Historically the Apache ActiveMQ message broker was originally created in a time where large messages was measured in MB and not in GB as you may do today. This is not the case with the next generation broker Apache ActiveMQ Artemis (or just Artemis) which has much better support for large messages. So its about time that the Camel team finally had ...

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Java Message System Introduction

java-interview-questions-answers

Java Message System In this article, I will talk about Message Orientated Middleware (MOM) and how it is implemented in Enterprise Java by JMS. Also, I will discuss the typical use cases which suit the use of JMS and different terminology used to talk about messaging solutions such as Publisher/Sender, Destination/Topic/Queue and Subscriber/Receiver. I will introduce the two types of ...

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Beware of slow transaction callbacks in Spring

spring-interview-questions-answers

TL;DR If your application is failing to obtain new database connection, restarting ActiveMQ broker may help. Interested? The problem with performance Few months ago we experienced a production outage. Many requests were failing with all too familiar: java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30003ms. at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:555) ~[HikariCP-2.4.7.jar:na] at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:188) ~[HikariCP-2.4.7.jar:na] at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:147) ~[HikariCP-2.4.7.jar:na] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:99) ...

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Building a horizontal JMS Bridge between two WildFly Servers using ActiveMQ Artemis

Sometimes it’s necessary to connect different Message Brokers together. In Enterprise Messaging this scenario is known as Bridging. It can be done with JMS and different protocols like AMQP,  ActiveMQ Artemis core protocol. This blogpost focusses on Bridging with JMS and two Apache ActiveMQ Artemis Brokers running which are running in WildFly. What’s a JMS Bridge? JMS Bridges typically are ...

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RabbitMQ retries using Spring Integration

I recently read about an approach to retry with RabbitMQ here and wanted to try a similar approach with Spring Integration, which provides an awesome set of integration abstractions. TL;DR the problem being solved is to retry a message(in case of failures in processing) a few times with a large delay between retries(say 10 mins +). The approach makes use of ...

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Remote JMS with WildFly Swarm

I’m blogging about WildFly swarm again? Short version is: I needed a test for remote JMS access and refused to setup something complex like a complete application server. The idea was to have a simple WildFly Swarm application which has a queue and a topic configured. Both should be accessible remotely from a standalone Java application. While the topic receives ...

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Message Durability in ActiveMQ 5.x

I get asked quite a bit to explain the basics of how ActiveMQ works with respect to how it stores messages (or doesn’t in some cases). Here’s the high level explanation of it. Note, the context is within JMS. If you use ActiveMQ’s non JMS clients (ie, STOMP, AMQP, MQTT, etc) then the behavior may be different in some cases. ...

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AWS SQS and Spring JMS integration

spring-interview-questions-answers

Amazon WEB Services provide us with the SQS messaging service. The java sdk for sqs is compatible with JMS. Therefore instead of using SQS as a simple spring bean we can integrate it with the JMS integration framework that spring provides. I will use spring-boot and gradle. The gradle file: group 'com.gkatzioura.sqstesting' version '1.0-SNAPSHOT' buildscript { repositories { mavenCentral() } ...

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