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OptaPlanner – Vehicle routing with real road distances

In the real world, vehicles in a Vehicle Routing Problem (VRP) have to follow the roads: they can’t travel in a straight line from customer to customer. Most VRP research papers and ...
java-interview-questions-answers

Really Dynamic Declarative Components

In this short post I am going to focus on ADF dynamic declarative components. I mean a well known ADF tag af:declarativeComponent. It can be used as a pretty convenient way to design ...
java-interview-questions-answers

Instant Big Data Stream Processing = Instant Storm

Every 6 months at Canonical, the company behind Ubuntu, I work on something technical to test our tools first hand and to show others new ideas. This time around I created an Instant ...
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Pluggable Knowledge with Custom Assemblers, Weavers and Runtimes

As part of the Bayesian work I’ve refactored much of Kie to have clean extension points. I wanted to make sure that all the working parts for a Bayesian system could be done, ...
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Bootstrapping Apache Camel in Java EE7 with WildFly 8

Since Camel version 2.10 there is support for CDI (JSR-299) and DI (JSR-330). This offers new opportunities to develop and deploy Apache Camel projects in Java EE  containers but also ...
java-interview-questions-answers

Everything Developers Need To Know About xPaaS

I’ve been reading a lot about Red Hat products lately and being interested in cloud and such since some years now, it’s pretty obvious for me to look into the cloud offerings ...
spring-interview-questions-answers

Secure REST services using Spring Security

Overview Recently, I was working on a project which uses a REST services layer to communicate with the client application (GWT application). So I have spent a lot of to time to figure ...
java-interview-questions-answers

Analysing the performance degradation/improvements of a Java EE application with interceptors

When you are developing a Java EE application with certain performance requirements, you have to verify that these requirements are fulfilled before each release. An Hudson job that ...
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Monitoring and Filtering Application Log to Mail with log4j

In today’s post I’m going to show you how to filter log statements into a warning email. This came out of a necessity to monitor a few critical points of one application I was working ...
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The anatomy of Hibernate dirty checking

Introduction The persistence context enqueues entity state transitions that get translated to database statements upon flushing. For managed entities, Hibernate can auto-detect incoming ...
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