Consume Protocol Buffer messages with Ionic
Published: 14. January 2017 • Updated: 1. December 2018 • ionic, spring, java, javascript
Published: 14. January 2017 • Updated: 1. December 2018 • ionic, spring, java, javascript
Published: 26. January 2017 • Updated: 4. December 2018 • angular, ionic, spring, java, javascript
Example of form validation in an Ionic application. How to create custom synchronous and asynchronous validators and how to validate data on the server with the Java Bean Validation framework.
Published: 24. January 2017 • Updated: 16. February 2018 • spring, java
How to create RSS and Atom feeds with the Spring Framework and the ROME library
Published: 8. January 2017 • Updated: 23. December 2017 • java, spring
Published: 5. February 2017 • Updated: 7. December 2018 • ionic, spring, java, javascript
How to implement a JWT authentication system with Ionic/Angular and Spring Boot.
Published: 26. February 2017 • Updated: 31. March 2020 • ionic, spring, javascript, java
This post describes how a Spring Boot can send messages over FCM to an Ionic / Cordova app
Published: 15. February 2017 • Updated: 16. February 2018 • java, s3
In this article, we take a closer look at Minio, a self-hosted S3 compatible server, and how to connect a Java application to it.
Published: 16. February 2017 • Updated: 6. December 2018 • ionic, cordova, spring, s3, javascript, java
How to upload files from an Ionic / Cordova app directly to a Minio server or Amazon S3 with pre-signed URLs.
Published: 12. February 2017 • Updated: 6. December 2018 • ionic, cordova, spring, javascript, java
In this article, we create an Ionic application where the user can take a picture, and the app uploads it to a Spring Boot application.
Published: 5. March 2017 • Updated: 16. February 2018 • java, spring
What are Server-Sent Events and how can you send them from a Spring Boot application
Published: 16. September 2017 • Updated: 25. October 2017 • java
How to create a simple MultiValue Map with Java 8
Published: 17. September 2017 • Updated: 16. February 2018 • java
How to use pluggable file systems in Java and a look at implementations outside the standard library
Published: 21. September 2017 • Updated: 4. December 2018 • spring, java, javascript, ionic
In this blog, we create REST services in Spring Boot and consume them in an Ionic app. We use the OpenAPI specification for generating API documentation and the client TypeScript code.
Published: 26. September 2017 • Updated: 4. December 2018 • java, ionic, javascript, spring
A closer look at the Flow.js JavaScript library that helps upload files from a browser to the server. Flow.js is a JavaScript library providing multiple simultaneous, stable, fault-tolerant, and resumable/restartable file uploads via the HTML5 File API.
Published: 7. November 2017 • Updated: 5. December 2018 • ionic, java, spring, javascript
In this blog post, I create a self-hosted location tracker that consists of three parts. An Ionic/Cordova application that continuously sends the current location to a Spring Boot application from where the locations are broadcasted to a website and visualized on Google Maps. Note that Google Maps usage may require a paid license depending on your use case.
Published: 5. November 2017 • Updated: 3. December 2018 • ionic, java, spring, javascript
In this blog post we create an Ionic app that dynamically requests location data points from a Spring Boot server and displays them on an OpenStreetMap map. The data points are stored in a MongoDB database, and we take advantage of the geospatial query support to read the data points only for a certain area.
Published: 18. December 2017 • Updated: 16. July 2019 • ionic, javascript, java, spring
In this blog post I present three different ways to integrate speech recognition functionality into an Ionic app. With a Cordova plugin, the Web Speech API and with RecordRTC and the Google Cloud Speech API.
Published: 13. January 2018 • Updated: 31. October 2021 • java, javascript
An example project that integrates a front end JavaScript application with the Parcel bundler and a Spring Boot application built with Maven into one project and ultimately create one executable JAR.
Published: 9. January 2018 • Updated: 7. December 2018 • java, javascript, pwa, spring
In this blog post, I show you how you can send push messages from a Spring Boot application over Firebase Cloud Messaging (FCM) to connected clients with the Web Push API. The Push API is part of the Service Worker specification and does not depend on any native plugins.
Published: 26. February 2018 • java
How to consume Server-sent events in a Java application.
Published: 27. February 2018 • java, javascript
Writing human-readable regular expressions with the VerbalExpression library
Published: 28. February 2018 • Updated: 31. October 2021 • java, javascript
In this blog post, we create a simple polling application with Java and JavaScript and send real-time updates with server-sent events.
Published: 4. February 2018 • Updated: 5. February 2018 • mongodb, java, database
A brief overview of capped collections in MongoDB and how to access them from Java
Published: 5. February 2018 • database, mongodb, java
A brief introduction to time to live indexes in MongoDB and how to access them from Java
Published: 1. March 2018 • Updated: 11. March 2023 • java
In this blog post, we're going to create Java applications that download and search the "Have I Been Pwned?" password list with over 840 million passwords.
Published: 3. May 2018 • java, javascript
In this blog post, I present four examples of how you can implement password checks for commonly used or compromised passwords.
Published: 1. May 2018 • java
How a Java server application can complete the server-to-server OAuth 2.0 flow and access a Google service
Published: 26. June 2018 • pwa, javascript, java, spring, ionic
This blog post takes a closer look at the Background Sync API, part of the service worker implementation, and presents an example that uses Background Sync to synchronize data between an Ionic web application and a Spring Boot server application.
Published: 4. October 2018 • java, javascript
Converting text from a web application into speech with Google Cloud Text-to-Speech
Published: 11. December 2018 • java, spring, ionic, javascript
This blog post shows you a way to upload pictures from a web application to Google Cloud Storage and run them through Google Cloud Vision. The application uses Ionic for the front end and Spring Boot for the back end. It utilizes signed URLs for permitting the client to upload pictures directly from the web application to Google Cloud Storage
Published: 23. December 2018 • java, javascript
Creating a simple feedforward neural network in Java and JavaScript, based on the algorithms of Tariq Rashid's book "Make Your Own Neural Network"
Published: 28. January 2019 • java, javascript, spring
Getting started with Cettia, a real-time web framework, and Spring Boot
Published: 23. January 2019 • java
In this blog post, we will take a closer look at the new HTTP Client introduced in Java 11.
Published: 31. January 2019 • java, spring
In this blog post we are going to set up a Spring Boot application with jOOQ and Flyway
Published: 4. January 2019 • javascript, java
How to JSON deserialize and serialize the new JavaScript primitive number type BigInt in a full-stack application with Spring Boot
Published: 9. January 2019 • java
In this blog post, we are going to set up a private root CA with mkcert on our local development machine, create a TLS certificate, and enable Spring Boot to use TLS and HTTP/2. We learn how to configure Charles, an HTTP proxy, to trust this private root CA, and we also take a brief look at HTTP/2 push.
Published: 1. February 2019 • java
In this blog post, we take a look at the capability of Java to monitor directories for changes. A feature that has been introduced a long time ago (2011) in Java 7
Published: 15. May 2019 • java, spring, ionic
In this blog post, we are going to implement a stateless authentication system with Spring Security, Spring Boot, and an Angular/Ionic client
Published: 13. June 2019 • java, javascript, spring, ionic
How to create a frictionless password auto-login experience with the Credential Management API.
Published: 12. June 2019 • java, spring, javascript
How to expose build information, like version number, build timestamp, git commit information, of Spring Boot and Angular applications
Published: 21. June 2019 • Updated: 5. April 2020 • java, spring
In this blog post, you learn how to write an authentication system with Spring Security that uses username/password and TOTP (Time-based One-Time Password) as second-factor
Published: 11. June 2019 • Updated: 18. November 2024 • java, javascript, spring, ionic
How to integrate tus.io implementations into JavaScript and Java applications to create reliable and resumable file uploads over HTTP.
Published: 11. June 2019 • Updated: 18. November 2024 • java, spring, javascript, ionic, capacitor
How to take pictures with the Capacitor camera plugin and upload them to a Spring Boot application with Angular's HttpClient and tus.io.
Published: 18. June 2019 • java
How to encode fixed 4 bytes Java integers into a variable-length format that uses less space.
Published: 9. August 2019 • java
How to use a catch-all SMTP server for development and testing email delivery. In this blog post, we are going to look at 6 different catch-all SMTP servers and a JUnit 5 example with an embedded catch-all SMTP server.
Published: 5. August 2019 • java
In this blog post, we take a look at Hibernate Envers, a library that provides an easy auditing/versioning solution for entity classes.
Published: 4. August 2019 • java
In this blog post, we take a look at JGit, a pure Java implementation of Git.
Published: 29. August 2019 • java
In this blog post, we are going to take a look at the JSON-P (JSR 374) standard for processing JSON in Java.
Published: 7. August 2019 • Updated: 18. November 2024 • java, spring
How to rate limit Spring MVC HTTP endpoints with bucket4j
Published: 25. August 2019 • javascript, java, spring, ionic
In this blog post, we will build a password-less authentication system with the FIDO2 WebAuthn standard. I will show you a full-stack demo application with an Ionic / Angular front end and a Spring Boot back end with Spring Security.
Published: 13. August 2019 • java, javascript
Sending Web Push notifications from a Java back end to a web browser
Published: 24. April 2020 • Updated: 20. May 2021 • javascript, spring, java
In this blog post, I show you how to build a chat application with Cettia and Google Cloud Translation that automatically translates chat messages.
Published: 3. April 2020 • Updated: 20. June 2021 • ionic, spring, javascript, capacitor, java
In this blog post, we take a closer look at how to receive push notifications with Capacitor and how to send them from a Spring Boot application.
Published: 23. April 2020 • Updated: 20. May 2021 • javascript, spring, java
In this blog post, I show you how to build a simple chat application with a JavaScript front-end and a Java backend.
Published: 4. April 2020 • Updated: 20. May 2021 • javascript, java
In this blog post, we are going to take a look at how to send Protocol Buffers messages from an Angular app to a Spring Boot back end.
Published: 1. April 2020 • Updated: 21. May 2021 • java
Oracle removed the Nashorn JavaScript engine in Java 15 (September 2020). In this blog post, I show you how to migrate to its successor - the GraalVM JavaScript engine.
Published: 3. May 2020 • Updated: 20. May 2021 • javascript, spring, java, ionic
In this blog post, I show you how to create an encrypted Java/JavaScript chat application with the Web Cryptography API.
Published: 5. May 2020 • java, angular, spring
In this blog post, I show you how to deploy an Angular application to Firebase Hosting and a Spring Boot application to Google Cloud Run
Published: 2. May 2020 • Updated: 31. October 2021 • javascript, java
In this tutorial, I show you how to develop a web application that presents your holiday photos on Google Maps
Published: 7. May 2020 • java, selfhost
Taking a closer look at the software that runs my blog
Published: 1. May 2020 • Updated: 20. May 2021 • javascript, java, ionic, angular
This blog post shows you how to integrate hCaptcha CAPTCHAs into a plain JavaScript project and Angular projects, with a Spring Boot back end.
Published: 12. May 2020 • Updated: 20. September 2023 • java
A summary of interesting small changes in the Java standard library and the language in Java 9 to 21.
Published: 4. May 2020 • Updated: 21. May 2021 • java, spring
A closer look at Spring Security's support for upgrading password hashes
Published: 6. May 2020 • java
How to install any Java application as a Windows service with WinSW
Published: 20. November 2021 • java
An overview of the new switch introduced in Java 14
Published: 22. January 2022 • go, java, aws
In this blog post, I take a look at S3 Select, a service that enables an application to access Amazon S3 objects with SQL SELECT. Code examples in Java and Go
Published: 15. January 2022 • go, java, aws
In this blog post, I show you how to send and receive Protocol Buffers messages over Amazon Simple Queue Service (SQS). The examples of producers (send) and consumers (receive) are written in Java and Go.
Published: 6. August 2023 • angular, java
In this blog post, I show you how to implement a web application with Angular that receives push notifications and a back end with Java that sends push messages. It uses the standard Push API supported by all major browsers.
Published: 29. January 2025 • java, spring, llm
A look at Spring AI's support for Tool/Function calling. How to write your own tools and integrate them into your Spring Boot application.