In one of my last blog post, I showed you how to upload and download files with React and Spring Boot. Today I want to give you a quickstart example on how to achieve the same with Java EE and Web Components (standards ftw!). In this blog post, I’ll be using Java 8, Java EE…
As a Java/Jakarta EE developer, we can rely on the javax standards to work on every certified application server in the same way. When it comes to managing the application server, every vendor has a different and proprietary API for managing its resources. To use a different application server you first have to get comfortable…
The productivity of your developers is crucial for the success of your project. Without fast deployments and short feedback-cycles about a new feature, you lose a lot of time just “idling”. As a Java/Jakarta EE developer, you will most likely have a local installation for the target application server and deploy the application several times…
Generating documents for e.g. invoices or reports is a central use case for enterprise applications. As a Java developer, you have a wide range of possible libraries to manipulate and create Word, Excel or PDF documents. To help you choose the right library, I going to present you a running example for generating PDF documents with…
For securing your enterprise applications you have several choices which require different configuration setups. Lately, the stateless approach is the de-facto standard for securing your microservice based landscape. With the choice, your applications don’t store session data as the client mostly sends a JWT token with each request and thus the applications know about his metadata…
Bootstrapping a new JSF can be quite cumbersome if you are new to Java EE. Even after weeks of training, I had to look up the anatomy of the or the correct folder structure. As the JSF technology is still a valid and reasoned choice for frontend development in enterprises, I’ve created a simple Maven archetype…
Writing good unit tests for your central business logic is essential for the speed of your development and a confident deployment to production. But there are also parts of your application where plain unit tests with mocking frameworks like Mockito aren’t that useful or result in a “mocking-hell”. The interaction of your application with your…
Manually creating a new Java EE Maven project can be quite cumbersome. Creating all required folders and files for a simple JAX-RS endpoint with a database access was quite error-prone in the past for me. I constantly mixed up WEB-INF and META-INF with its files and was tired of manually creating the project structure. The bootstrapping of a…
Lately, I had the requirement to generate Word documents from specific templates and fill them dynamically with data. For this task, I compared the following Java libraries: Apache POI, iText PDF, Docx4j and XDocreports. I compared them while using the following characteristics: Possibility to replace variables, amount of additional dependencies, lines of code to generate…
Recently I had the requirement to limit the access to specific JAX-RS endpoints and to keep track of the user’s current amount of API calls. To solve this problem I asked Adam Bien (@AdamBien) in his monthly Airhacks Q&A about this requirement and he gave me a hint for a possible solution while using the ContainerRequestFilter interface…
For messaging, I have always thought of Apache Kafka as the central solution for messaging. While learning more about Java EE I came along the Java Message Service (JMS) specification and gave it a try. In addition, I wanted to learn more about the JMS capabilities of the Open Liberty application server. In this blog post, I’ll show you how to create a…
Securing your web application can be cumbersome. I recently tried to secure a JSF 2.3 application with the latest Java EE 8 Security API (JSR-375) and it was quite simple. In this blog post, I’ll show you the required configuration steps for securing your JSF application with a form-based authentication mechanism. In the example, I’ll use an…
As my last blog post about a short intro to JavaServer Faces 2.3 got a lot of attention (my tweet got even retweeted by the Java EE Guardian’s twitter page (@javaee_guardian) I want to continue to write about JSF. A developer previously working with JavaScript web frameworks writes about what he is seeing in JSF.…
Scrolling through my news feed on Twitter I get flooded with new releases of npm modules and more and more blog articles about server-side rendering technologies for the latest Single Page Application frameworks like Angular, React. The following tweet summarized my current feelings: As I personally really like React and used it in the past for several projects,…
While I was scrolling through my twitter feed I noticed a post about the new Open Liberty 18.0.0.2 release on June 29. In the official blog post about the new release, they pointed out that Open Liberty now fully supports JavaEE 8 (JAX-RS 2.1, JPA 2.2, JSF 2.3 and so on ..) and that they…
Welcome to my first article for my genre #WHAT IS?. Today I’ll show you how I started to appreciate the concept of Dependency Injection (abbreviation: DI) and my bumpy learning path. During several coding projects at the Unversity, I never enjoyed the power of DI. As we were greenhorn developers none of our project members…