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A journey with Scala

To those who are regular visitors of this blog, it is well known that when it comes to developing code I am a Spring/Java guy. Also I use different technologies like node or python but this depends largely on the project’s needs. Due to some recent projects and courses involving Spark, stumbling on Scala was inevitable. After some investigation I decided ...

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From Macro to Microservices: Jumpstarting Your Transition

In my last article, we went through the reasons why changing from macro to microservices might be a good idea. In this one, we get to the real stuff: How a facade proxy should function to start replacing your old services and/or introducing new ones the easy way, and then how to deploy it to AWS inside a Docker container. ...

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Understanding the first level JPA cache

java-interview-questions-answers

I can bet that every Java developer at least heard about L1 (aka EntityManager or Session) cache. But is your level of understanding it good enough? If you’re not sure, consider going through this post. At first, we need to know what the persistence context is. Following EntityManager JavaDoc we know, that: “A persistence context is a set of entity instances in which for ...

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Spring Batch Restartability

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First of all, I’d like to give a big thank you to the wonderful folks from Spring who have given countless hours of their time to ensure the viability of Spring Batch jobs, and the seemingly magical ability to issue restart on a job! Thank you for this elegant toolset that permit us to tear through massive datasets, while enabling ...

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Grails Anti-Pattern: Everything is a Service

The context Grails makes it very easy to put any logic of your application in a service. Just grails create-service and you’re good to go. There’s a single instance by default, injectable anywhere. Powerful stuff and makes it easy to get up ‘n running very fast! Creating a new application, following so-called “best practices” from blogs like these and the ...

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Use Spring Cloud Config as externalized configuration

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One of the most important practices when it comes to continuous delivery is building your binaries only once and use that one in the different environments (dev, test, acceptance, etc). This means that most likely you will need to externalize your configuration of your application. With Spring Boot applications it comes down to keep the values of your properties in ...

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