Spring Tips #2: Layered JARs with Spring Boot 2.3

Sample code referred in this article is available on GitHub. Using Docker containers for deployment of Java applications becomes more and more popular these days. To ship a new version of application you just build a Docker image with new version of JAR file and push it to the repository, so the deployment team can … Continue reading "Spring Tips #2: Layered JARs with Spring Boot 2.3"

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Scaling down microservices

Microservice architecture became very popular in the last years. This approach has a lot of benefits, which are widely praised at conferences. Unfortunately, it is very common to forget about the problems and difficulties we may encounter. Those who know me a little, know that I have always been skeptical of this approach. In this … Continue reading "Scaling down microservices"

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Some short thoughts on strategy pattern

Strategy is one of the most useful design patterns, which allows us to change algorithms or implementations of an operation during runtime. Typical use cases include validating or parsing data depending on some decisions made on the fly. And although the pattern is widely described in various sources and well known amongst programmers I think there is still a missing part in great number of examples we can find. Let me explain what I have in mind…

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Automated validation of DB schema migrations

Object Relational Mapping frameworks, such as Hibernate, very often provide a way to automatically generate the database schema based on persistent classes. While it is very convenient as a proof of concept or for very simple applications, it is not a production ready approach. In reality you have to write scripts to version your schema … Continue reading "Automated validation of DB schema migrations"

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Effective RESTful search API in Spring

Flexible RESTful search is very often a must-have for a web application. While the concept is easy and not new, it is very often implemented in a repetitive and tedious way. In this post I will demonstrate an effective way of implementing search API with Spring Data and Specification Argument Resolver. Naive approach With Spring … Continue reading "Effective RESTful search API in Spring"

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