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Grails Spring Security Core Plugin – Registering Callback Closures

I was searching for a way to hook business logic after successful user login while using Spring Security Core plugin. The simplest way to do this is to register callback closures. It ...
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Spring RestTemplate with a linked resource

Spring Data REST is an awesome project that provides mechanisms to expose the resources underlying a Spring Data based repository as REST resources. Exposing a service with a linked ...
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Spark: Write to CSV file

A couple of weeks ago I wrote how I’d been using Spark to explore a City of Chicago Crime data set and having worked out how many of each crime had been committed I wanted to write ...
spring-interview-questions-answers

Spring request-level memoization

Introduction Memoization is a method-level caching technique for speeding-up consecutive invocations. This post will demonstrate how you can achieve request-level repeatable reads for ...
spring-interview-questions-answers

Spring Data JPA Tutorial: Introduction

Creating repositories that use the Java Persistence API is a cumbersome process that takes a lot of time and requires a lot of boilerplate code. We can eliminate some boilerplate code ...
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Can MicroServices Architecture Solve All Your Problems?

IT is one field where you can find new things coming everyday. Theses days the whole developer community websites are flooded with MicroServices and Docker related stuff. Among them ...
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What I look for in frameworks

In every project the discussion comes up over and over again: should we use framework X? or Y? or no framework at all? Even when you limit yourself to the frameworks for web development ...
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Spark: Write to CSV file with header using saveAsFile

In my last blog post I showed how to write to a single CSV file using Spark and Hadoop and the next thing I wanted to do was add a header row to the resulting row. Hadoop’s FileUtil#copyMerge ...
java-interview-questions-answers

Developing with WSO2

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 ...
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The New Agile–The beginning

Frequent readers of this blog know I’m a big proponent of agile, with a small ”a”. I tend to scoff at new big ideas that seem to jump out of a marketing committee. Truth is, sometimes ...
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