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Understanding Callable and Spring DeferredResult


1. Introduction Asynchronous support introduced in Servlet 3.0 offers the possibility to process an HTTP request in another thread. This is specially interesting when you have a long running task, since while another thread processes this request, the container thread is freed and can continue serving other requests. This topic has been explained many times, but there seems to be ...

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RESTful timers in Java EE


In this post…. Whirlwind tour of EJB timers Working with EJB timers on the fly via simple REST interface with a sample implementation Update (14 July 2015) The front end for the application is now available on OpenShift. Since I am a front end novice, I assembled this HTML5 + AngularJS app with help from other sources :) So it ...

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Sending JMS Messages From WildFly 8 To WebLogic 12 with Camel


System integration is a nice challenge. Especially, when you’re looking for communication standards and reliable solutions. In today’s microservices world, everybody talks about REST services and http-based protocols. As a matter of fact, this will never be enough for most enterprise projects which typically tend to have a much more complex set of requirements. A reasonable solution is a Java ...

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Using Camel Routes In Java EE Components


I’ve been working with Camel since a while now and I really like it’s simplicity. Using it on top of Java EE always was a little bit of a challenge and one of the recent talks I gave about how to do this and the different methods of bootstrapping Camel in Java EE actually proposes to use the WildFly-Camel Subsystem. ...

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Multi-container Applications using Docker Compose and Swarm


Docker Compose to Orchestrate Containers shows how to run two linked Docker containers using Docker Compose. Clustering Using Docker Swarm shows how to configure a Docker Swarm cluster. This blog will show how to run a multi-container application created using Docker Compose in a Docker Swarm cluster. Updated version of Docker Compose and Docker Swarm are released with Docker 1.7.0. ...

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Unleash the power of storing JSON in Postgres


An article by Sarah Mei titled “Why you should never use MongoDB” discusses the issues you’ll run into if you try to use a NoSQL database when a relational database would be far superior. An example of this is when data that was thought to be in a silo needs to cross boundaries (what relational DBs are great at). Another ...

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Using HAProxy as a reverse proxy for AWS microservices


Amazon’s EC2 micro instances offer a very affordable option for hosting a Docker-based micro-services architecture. Each micro instance can host several Docker containers.  For example, you may have a simple Node.js-based web application that you would like exposed as and another Java/Tomcat webapp surfaced at Each could be hosted through a separate (and perhaps clustered) Docker container, with ...

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