Spring on SivaLabs

Philip's Testing Spring Boot Applications Masterclass Course Review

Wed, 14 Oct 2020 23:29:17 +0000

If you ever worked on a large project which doesn’t have any tests then you know how painful it is to work on such codebase.

You know what is more painful? Working on a project which has plenty of USELESS tests written for the sake of passing minimum code coverage requirement.

LocalStack Spring Boot Starter Tutorial

Tue, 15 Sep 2020 23:29:17 +0000

I was working on a Spring Boot application which is planned to deploy on AWS and, we were using S3, SQS and RDS services.

LocalStack provides an easy-to-use test/mocking framework for developing AWS based Cloud applications.

All the resources you ever need as a Java & Spring application developer

Sun, 13 Sep 2020 23:29:17 +0000

Nowadays software development is a challenging task as the number of programming languages, frameworks, libraries are increasing rapidly day by day. Luckily, the number of resources to learn on the internet for free also increased a lot. There are a ton of free resources to learn almost everything on the internet. There are lots of official documentation, blog posts, Udemy courses, YouTube videos etc.

Testing Spring Boot Applications

Mon, 07 Oct 2019 02:29:17 +0000

Spring Boot is the most popular tech stack for building Java-based REST APIs. In this tutorial, we will learn how to write tests for Spring Boot applications.

Create Spring Boot Application
Unit Testing using JUnit 5 and Mockito
Integration Testing using TestContainers
Testing MicroService Integrations using MockServer

Kafka Tutorial - Producer and Consumer using Spring Boot

Mon, 24 Jun 2019 02:29:17 +0000

In the previous post Kafka Tutorial - Java Producer and Consumer, we learned how to implement a Producer and Consumer for a Kafka topic using the plain Java Client API.

In this post, we are going to look at how to use Spring for Kafka, which provides a high-level abstraction over the Kafka Java Client API to make it easier to work with Kafka.

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

Mon, 14 Aug 2017 12:30:43 +0000

In the previous article, Introduction to Spring Cloud Config Server, we have seen how to use Spring Cloud Config Server.

But the problem is that to reload the config changes in Config Client applications, we need to trigger the /refresh endpoint manually. This is not practical or viable if you have a large number of applications.

Spring Cloud Tutorials – Introduction to Spring Cloud Config Server

Mon, 14 Aug 2017 03:35:07 +0000

Spring Boot provides a 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 cannot update the properties at runtime. If we change the properties, we need to restart the application to use the updated configuration properties.

Retrying Method Execution using Spring AOP

Tue, 05 Jan 2016 15:40:36 +0000

One of my blog followers sent an email asking me to show an example of “Real-World Usage of Spring AOP”. He mentioned that in most examples, the usage of Spring AOP is demonstrated for logging method entry/exit, Transaction management, or Security checks. He wanted to know how Spring AOP is being used in “Real Projects for Real Problems”.

So I would like to show how I have used Spring AOP in one of my projects to handle a real problem.

A Developers Perspective on Spring vs JavaEE

Mon, 15 Jun 2015 13:04:00 +0000

In the Java community, Spring vs. JavaEE is a never-ending debate. In such debates, people form two groups consisting of evangelists, architects, and hardcore fans of one platform and debate endlessly. Those who participate in the debates may be architects who are responsible for platform selection. But what would developers think about this Spring vs. JavaEE debate?

I am a Java developer who uses both Spring and JavaEE, and I am not part of the Spring or JavaEE fan club. Here, I would like to share my own thoughts on this epic Spring vs. JavaEE debate.

A bunch of Maven Archetypes for Spring based Projects

Mon, 29 Oct 2012 12:18:00 +0000

Maven is a good project management tool that greatly reduces the amount of time we spend creating Java projects with a proper structure. With so many predefined Maven archetypes, it is even easier to create projects by simply selecting the archetype based on the technologies we need and the type (jar/war/ear) of project we want to create.

However, sometimes those predefined archetypes’ structures may not suit our needs well, or we may need some more additions to the pre-configured dependencies/frameworks, etc.

MyBatis Tutorial : Part4 – Spring Integration

Wed, 24 Oct 2012 00:40:00 +0000

MyBatis Tutorial: Part1 – CRUD Operations

MyBatis Tutorial: Part-2: CRUD operations Using Annotations

MyBatis Tutorial: Part 3 – Mapping Relationships

MyBatis Tutorial : Part4 – Spring Integration

MyBatis-Spring is a sub-project of MyBatis that provides Spring integration support, which drastically simplifies MyBatis usage. For those who are familiar with Spring’s Dependency Injection process, using MyBatis-Spring is very simple.

First, let us see the process of using MyBatis without Spring.

Create SqlSessionFactory using SqlSessionFactoryBuilder by passing mybatis-config.xml, which contains DataSource properties, a list of Mapper XMLs, TypeAliases, etc.
Create an SqlSession object from SqlSessionFactory.
Get a Mapper instance from SqlSession and execute queries.
Commit or roll back the transaction using the SqlSession object.

With MyBatis-Spring, most of the above steps can be configured in the Spring ApplicationContext, and SqlSession or Mapper instances can be injected into Spring Beans. Then we can use Spring’s TransactionManagement features without writing transaction commit/rollback code all over the place.