Reactive Spring: Webflux Multipart File Upload

A clear, simple example of multipart file upload using Reactive Spring Spring Boot v2.0.3.RELEASE Coding using reactive functional style (as opposed to annotation-based) Spring Initializr Dependencies: "Reactive Web" Language: Kotlin Notes follow after the code: https://gist.github.com/dvas0004/fdb63086cd77869066e83a1ca25757d9 Notes: Spring Webflux makes it extremely easy to build reactive web services - but it takes a while to … Continue reading Reactive Spring: Webflux Multipart File Upload

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Drill Down into Spring Boot Actuator metrics

We've only seen this very useful feature documented in the official Spring Actuator API Documentation, so maybe not many are aware that you actually have some control over what the Spring Actuator metrics return to your requesting client. The Spring Actuator API allows you to expose several useful metrics that you can use to monitor … Continue reading Drill Down into Spring Boot Actuator metrics

Google Yolo and Spring Boot 2.0 Authentication

Back in 2016, Google announced the "Open Yolo" project: You Only Login Once. It originally seemed to be an Android library but during Google's last Dev Summit in October 2017, Google released "One-tap Sign-ups On Websites and API Integrations" which brings Google Yolo to your website via JavaScript goodness. There's a very easy guide that … Continue reading Google Yolo and Spring Boot 2.0 Authentication

Nugget Post: Reactive Functions to parse nested objects

Note this article assumes familiarity with the Observer Pattern / Reactive Programming as described here: http://reactivex.io/ Some APIs return complex nested JSON objects. For example, take this cleaned up sample response from ElasticSearch (which incidentally is used to build the "Data Table" visualization): https://gist.github.com/dvas0004/8f3427955a5bb21213c864d30094d072 Note the structure of the object. Within the top level "aggregations" object … Continue reading Nugget Post: Reactive Functions to parse nested objects

Elasticsearch REST API: JEST upsert

I've already written about tips and tricks when using the Elasticsearch Java API. The Elasticsearch REST API has been going from strength to strength, and it seems that going forward the Elasticsearch team will focus more on the REST API than the native JAVA client. At the time of writing however, the official java REST library … Continue reading Elasticsearch REST API: JEST upsert

React JS : Tables in the browser

A good exersize while learning React JS was building a re-usable component that produces HTML tables given an arbitrary JSON array of objects in the form: [{'col1_name':'col1_value','col2_name':'col2_value'} , {'col1_name':'col1_value','col2_name':'col2_value'}] So a practical example of the above would be: [{'name':'dave','age':'12'},{'name':'foo','age':'19'}] With the resulting table being: Here's the reusable code (feel free to improve/include in your projects): … Continue reading React JS : Tables in the browser

Lessons Learned: CrossWalk and Enhanced Webviews

I recently had a problem (seems to be a very common one [1][2][3]) when building a hybrid HTML5 mobile app. As can be seen in this online demo (https://mobilehtml5.org/ts/?id=23), one can use the input html tag with type="file" accept="image/*" to quickly and easily bring up the user's camera if they visit the site from a mobile … Continue reading Lessons Learned: CrossWalk and Enhanced Webviews