Saving the creation/modification timestamp of database records plays vital role in production applications. That helps in diagnosing issues and events. If you're using Spring Data JPA, it's not a big deal. It's officially documented here. Below are the precise steps. 1) Add/edit orm.xml Create...

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In this series of posts, we'll dive into how exactly to configure Spring Security for reactive and stateless WebFlux REST APIs. Specifically, we'll look at how to: Have Spring Security pick users from our user table, rather than its default in-memory user-store. Support form-login to obtain a...

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In a previous series, we discussed a real-world pattern for exception handling and validation in Spring Boot & MVC REST Web Services. Please go through first if you have not. To summarize, we recommended coding an ErrorComposer to compose errors from exception objects, which could be used in...

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JWTs could be very useful in RESTful Web Services — not only for stateless authentication, but for all the purposes that require tokens — e.g. email verification and forgot-password. In this post, we'll discuss why and how to use the Nimbus JOSE + JWT library for creating and parsing JWT (JWE)...

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In this post, we'll discuss how to receive data in a REST end-point in multiple formats. Say you have an endpoint for adding customers, as below: POST /customers There could be two types of customers, INDIVIDUAL and ORGANIZATION. For individuals, the body would have the following format: { ...

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Postman is one of the most popular API development environments, which needs no introduction to API developers. But strangely, numerous API developers often ignore many of its key features and make their work unnecessarily difficult. In this post, we'll discuss such key features that every API...

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When developing an application, we sometimes need to access the currently logged in user programmatically. In this post, we’ll discuss how to do that when using Spring Security — both in non-reactive (Spring MVC) as well as reactive (Spring WebFlux) applications. The code snippets are derived...

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Spring Framework 5 is coming – with many shiny features – including a new reactive framework. You can find the list of new features at many places in the Internet. Here is a good post on it. So, I gave a closer look to figure out what’s in it for my students. Most of the grand features doesn’t...

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Java 8 lambda expressions make our code concise and readable. However, it’s the method references, along with the static and default methods in functional interfaces, which makes our code shine. Let’s take an example. Suppose we have an array of names that we want to sort. The array looks like...

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