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Tag Archives: Spring Boot

Call on me, or Asynchronous REST

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This article is a very simple example of a working asynchronous REST application, made with Spring Boot + Java 8. Spring Boot makes developing web applications almost ridiculously easy, but to simplify the task even more, I took an example from Spring repository called rest-service , forked it to my own repository and changed it for my purposes to create two applications: ...

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Spring Boot – spring.config.name – Case Study

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Externalizing Spring Boot application properties is useful when the same application code must be used with different configuration. If the configuration is to be kept away from the source code (which is considered a best practice anyways)spring.config.location environment property can be used to point the directory location with properties files for example. On the other hand, spring.config.name can be used ...

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Building Spring Boot RESTful Service + Spring Boot Actuator

Overview What is REST? REST(REpresentational State Transfer) is the architectural style the web is built on and has become a standard software design pattern used for web applications. The term Representational State Transfer was first used by Roy Fielding, the originator of REST and one of the principal authors of HTTP specification, in his doctoral dissertation. There are many good ...

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Using Gmail as SMTP server from Java, Spring Boot apps

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Gmail users can use Gmail’s SMTP server smtp.gmail.com to send emails from their Spring Boot apps. For this let us do some setup in the app: Provide SMTP connection properties in the application.properties file: spring.mail.host=smtp.gmail.com spring.mail.username=<your gmail/google app email> spring.mail.password=***** spring.mail.port=587 spring.mail.properties.mail.smtp.starttls.enable=true spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.starttls.required=true Use Spring Boot Email tools library – which is a wrapper over Spring Boot Email starter library. ...

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Integrating Swagger with Spring Boot REST API

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In the last post, I talked about my experience with creating RESTFul Services using Spring Boot. When creating a REST API, proper documentation is a mandatory part of it. What is Swagger? Swagger(Swagger 2) is a specification for describing and documenting a REST API. It specifies the format of the REST web services including URL, Resources, methods, etc. Swagger will generate ...

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Building a RESTFul Service using Spring Boot

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Everyone is talking about Microservices such as WSO2 Microservice Framework, Spring Boot, etc. Since I haven’t worked on any Spring related project since a very long time, I thought to implement a simple RESTFul service using Spring Boot. So I started with Spring documentation. It is straightforward.  You can create the structure of your project using “Spring Initializr“. This is an online ...

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Spring Webflux – Kotlin DSL – a walkthrough of the implementation

In a previous blog post I had described how Spring Webflux, the reactive programming support in Spring Web Framework, uses a Kotlin based DSL to enable users to describe routes in a very intuitive way. Here I wanted to explore a little of the underlying implementation. A sample DSL describing a set of endpoints looks like this: package sample.routes import org.springframework.context.annotation.Bean ...

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Spring Cloud Tutorials – Auto Refresh Config Changes using Spring Cloud Bus

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Problem In the previous article Introduction to Spring Cloud Config Server(http://sivalabs.in/2017/08/spring-cloud-tutorials-introduction-to-spring-cloud-config-server/) we have seen how to use Spring Cloud Config Server. But, the problem is to reload the config changes in Config Client applications we need to trigger /refresh endpoint manually. This is not practical and viable if you have large number of applications. Solution Spring Cloud Bus module can be used to link ...

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Spring Cloud Tutorials – Introduction to Spring Cloud Config Server

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Problem SpringBoot provides lot of flexibility in externalizing configuration properties via properties or YAML files. We can also configure properties for each environment (dev, qa, prod etc) separately using profile specific configuration files such as application.properties, application-dev.properties, application-prod.properties etc. But once the application is started we can not update the properties at runtime. If we change the properties we need to restart the application ...

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