Home » Author Archives: Pascal Alma

Author Archives: Pascal Alma

Pascal is a senior JEE Developer and Architect at 4Synergy in The Netherlands. Pascal has been designing and building J2EE applications since 2001. He is particularly interested in Open Source toolstack (Mule, Spring Framework, JBoss) and technologies like Web Services, SOA and Cloud technologies. Specialties: JEE, SOA, Mule ESB, Maven, Cloud Technology, Amazon AWS.

More advanced stuff with JMS and AWS SQS

java-interview-questions-answers

As you might know SQS in AWS SQS stands for ‘Simple Queue Service’. While playing around with it I recently found one of the reasons why it may be called ‘simple’. In two previous posts (here and here) I showed to use SQS as a JMS queue provider in combination with the Spring Framework. With this basic setup I decided ...

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Creating a Message Driven Bean with AWS SQS in Spring

spring-interview-questions-answers

In my previous post I showed a simple example how to use AWS SQS with Spring Framework to put messages on a queue and to read them from the queue. In this post I go one step further and use Spring to create a ‘Message Driven Bean’ so each message that is put on the queue is picked up and ...

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Using AWS SQS as JMS provider with Spring

spring-interview-questions-answers

Recently AWS published a new client library that implements the JMS 1.1 specification and uses their Simple Queue Service (SQS) as the JMS provider (see Jeff Barr’s post here). In my post I will show you how to set up your Maven project to use the Spring Framework to use this library. We will perform the following steps:     ...

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Message Content Filtering with WSO2 ESB

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Every integration architect or developer should be familiair with Enterprise Integration Patterns (EIP) as described by Gregor Hohpe and Bobby Woolf. One of the patterns is the ‘Content Message Filter’ (not to be confused with the Message Filter pattern). There are multiple ways to achieve this in WSO2 with different Mediator. One way is using the XSLT Mediator where you ...

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Running PageRank Hadoop job on AWS Elastic MapReduce

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In a previous post I described an example to perform a PageRank calculation which is part of the Mining Massive Dataset course with Apache Hadoop. In that post I took an existing Hadoop job in Java and modified it somewhat (added unit tests and made file paths set by a parameter). This post shows how to use this job on ...

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Calculate PageRanks with Apache Hadoop

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Currently I am following the Coursera training ‘Mining Massive Datasets‘. I have been interested in MapReduce and Apache Hadoop for some time and with this course I hope to get more insight in when and how MapReduce can help to fix some real world business problems (another way to do so I described here). This Coursera course is mainly focussing ...

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Making use of the open sources of WSO2 ESB

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When implementing services using the WSO2 stack (or any other open source Java framework) you will sooner or later run into a situation that the framework behaviour doesn’t do what you expect it should do. Or you just want to verify the way a product works. I lately had several of these experiences and I got around it to setup ...

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Developing with WSO2

java-interview-questions-answers

Since a few months I am back working with WSO2 products. In the upcoming posts I describe some of the (small) issues I ran into and how to solve them. The first thing I did when setting up my development environment was downloading the Developer Studio (64-bit version) on my Mac. After unzipping the downloaded zip file you see the ...

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right-pad values with XSLT

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In this post an XSLT function that can be used to right-pad the value of an element with a chosen character to a certain length. No rocket science but this might become handy again so by putting it down here I don’t have to reinvent it later. The function itself looks like:               <xsl:stylesheet ...

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Mule ESB, ActiveMQ and the DLQ

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In this post I will show a simple Mule ESB flow to see the DLQ feature of Active MQ in action. I assume you have a running Apache ActiveMQ instance available (if not you can download a version here). In this example I make use of Mule ESB 3.4.2 and ActiveMQ 5.9.0. We can create a simple Mule project based ...

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