Category: Spring Boot
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How to connect to database using ConnectionDetails interface in Spring Boot?
Let’s say you want to connect to a database in your Spring Boot application. You first add Spring Data dependency. Then to configure the database details , you had two options: Starting Spring Boot 3.1.1 you have one more option. Using ConnectionDetails interface. Let’s see how to do that with an example. STEP 1: Add…
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How to implement Circuit Breaker Design Pattern in Spring Boot?
Table of Contents: Problem: Fault tolerance is a major requirement for enterprise applications. If your application gets huge load , how does it behave? If something wrong happens within your application and you still want to handle it gracefully , what do you do? Fault tolerance is especially important for microservices since many microservices communicate…
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How to implement SAGA design pattern in Spring Boot?
Contents: Problem: Microservices come with their own advantages and disadvantages. One such disadvantage is managing distributed transactions. Let’s say your transaction spans 4 different microservices. How do you ensure that your transaction either commits successfully with all the 4 tasks succeeding or fails successfully if any of the tasks is not completed ( the completed…
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How to implement CQRS design pattern in Spring Boot?
Contents Problem: Let’s say you run a large scale ecommerce store. You have a large user base who query your system for products much more than they buy them. In other words , your system has more read requests than write requests. And so you would like to handle the high load of read requests…
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How to share data across multiple components for a single request in a Spring Boot application?
Let’s say that you make a REST API request to a spring boot web application. There is a security requirement that you need to log the user id across all the method calls in the application for this particular request. Something like this: So , if your application flow starts from a controller class and…
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Different ways to do versioning of REST APIs in Spring Boot
Most of our web apps communicate through HTTP / REST APIs. These APIs can evolve over time. And hence maintaining different versions of them can be helpful. For example , lets say you have been hitting a REST API which returns the different products available on an ecommerce store. The owners decide to launch a…
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Different ways to call REST APIs in Spring Boot without additional libraries
In today’s world most modern web apps talk to each other through HTTP APIs. REST API is a popular standard for these HTTP APIs. So calling a REST API from your backend app is a critical functionality. Spring Boot provides multiple abstractions to do this in a simple way. Here are four different ways: Using…
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How to query data in Spring Data through Example?
One of the frequent operations you perform on a database is retrieving data based on certain criteria. Let’s say you have a table containing developer details , their name , experience and their primary technology skill. And you want your app to be able to query this data. There are many ways to do this.…
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How to send emails in Spring Boot?
To send emails using the Spring Boot Email Starter in a Spring Boot application, you can do the following: STEP 1: Add the Spring Boot Email Starter dependency to your project: STEP 2: Configure the connection to the email server in your application.properties file: STEP 3 Inject the JavaMailSender bean into your service and use…
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How to implement Event Sourcing in Spring Boot?
All our web applications deal with data. We store this data mostly in a database. The data which is stored thus represents the current state of the data. For example , if you have a Customer table the table will have entries which represent the current state of the customer (what their name is and…
