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Creating a REST API with Spring Boot and MongoDB

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This year I greeted Christmas in a different fashion: I was a part of the Java Advent Calendar. Let’s boot up for Christmas: Spring Boot is an opinionated framework that simplifies the development of Spring applications. It frees us from the slavery of complex configuration files and helps us to create standalone Spring applications that don’t need an external servlet ...

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Avoid unwanted component scanning of Spring Configuration

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I came through interesting problem on Stack Overflow. Brett Ryan had problem that Spring Security configuration was initialized twice. When I was looking into his code I spot the problem. Let me show show the code. He has pretty standard Spring application (not using Spring Boot). Uses more modern Java servlet Configuration based on Spring’s AbstractAnnotationConfigDispatcherServletInitializer.         ...

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Black Box Testing of Spring Boot Microservice is so easy

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When I needed to do prototyping, proof of concept or play with some new technology in free time, starting new project was always a little annoying barrier with Maven. Have to say that setting up Maven project is not hard and you can use Maven Archetypes. But Archetypes are often out of date. Who wants to play with old technologies? ...

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Externalizing session state for a Spring-boot application using spring-session

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Spring-session is a very cool new project that aims to provide a simpler way of managing sessions in Java based web applications. One of the features that I explored with spring-session recently was the way it supports externalizing session state without needing to fiddle with the internals of specific web containers like Tomcat or Jetty. To test spring-session I have ...

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Spring boot war packaging

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Spring boot recommends creating an executable jar with an embedded container (tomcat or jetty) during build time and using this executable jar as a standalone process at runtime. It is common however to deploy applications to an external container instead and Spring boot provides packaging the applications as a war specifically for this kind of a need. My focus here ...

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Spring Boot Actuator: custom endpoint with MVC layer on top of it

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Spring Boot Actuator endpoints allow you to monitor and interact with your application. Spring Boot includes a number of built-in endpoints and you can also add your own.   Adding custom endpoints is as easy as creating a class that extends from org.springframework.boot.actuate.endpoint.AbstractEndpoint. But Spring Boot Actuator offers also possibility to decorate endpoints with MVC layer.   Endpoints endpoint There ...

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Spring Boot / Java 8 / Tomcat 8 on Openshift with DIY

DIY cartridge is an experimental cartridge that provides a way to test unsupported languages on OpenShift. It provides a minimal, free-form scaffolding which leaves all details of the cartridge to the application developer. This blog post illustrates the use of Spring Boot / Java 8 / Tomcat 8 application with PostgreSQL service bound to it. Creating new application Prerequisite Before ...

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Spring Boot and Spring Data REST – exposing repositories over REST

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Exposing Spring Data repositories over REST is pretty easy with Spring Boot and Spring Data REST. With minimal code one can create REST representations of JPA entities that follow the HATEOAS principle. I decided to re-use Spring PetClinic’s JPA entities (business layer) as the foundation for this article.       Application foundation The PetClinic’s model is relatively simple, but ...

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