In Spring MVC a server-side validation was implemented using annotations. We could just put @Valid before the body payload in the controller method and Spring did all dirty work for us. On the other side, Spring Webflux implements a functional-style web layer, which is based on router functions and handlers. This is non-blocking API and […]
Eclipse Vertx is a robust technology to build reactive microservices or serverless functions. When you develop such applications, the role of server side validation rises. In traditional web applications we combine both client-side and server-side validation techniques. However, in API world we can be in situations without clients (when you have a public API). We […]
When you are working on any somehow complex application, you need to enable validation. For example, if user submits a form or a request, your app should check, that data is in an appropriate format and required fields are not missed. When user signs up, we need to validate that an email address is proper […]
Recently I started to learn Clojure, and usually, my first phase is to complete small programming exercises. To practice Clojure I decided to solve some CodingBat problems. A common task here is to check, if an array does contain some value. The expected result should be a boolean value. When I moved to practical implementations, […]
An authentication with tokens became a must-have feature for modern web apps. It suits natively to single page applications and mobile applications. While Spring is de facto standard in Java ecosystem, there are developers, who prefer to use alternative solutions. This is true, because Spring is quite heavy platform and there is a number of […]
In the previous post we have already talked about authentication in Spring Webflux. We implemented a component, that contains a required business logic to process login and signup, and to issue JWT. However, to fullfil this security flow, we also need a component, that we assert a token: extract Authorization header from HTTP request and […]
Almost any more or less complex application has to deliver notifications. As usual, it is done via traditional emails, especially in cases of password reset messages or transactional notifications etc. There is a number of cloud solutions that abstract mail flow via consumable REST API. For example, Postmark. I used Postmark for some time, but […]
One of issues when you work with relational databases in Java is that they are unable to translate object relationships (such as composition) due to the tabular nature of data sources. That means that as developers we usually tend to have an intermediate layer, which is responsible to abstract the data source’s data organization. This […]
Unit tests serve to verify individual components, mostly on business logic level, and to ensure that components perform as expected. In Spring Webflux apps this level is a level of services. Here we want to check that the defined flow is executed properly. To do this we usually use a testing framework, like JUnit and […]
The topic of error handling in web applications is very important. From a client perspective it is essential to know on how was the request proceeded and in case of any error is crucial to provide to the client a valid reason, especially if the error was due to the client’s actions. There are different […]