My 2018 predictions:
- Thin WARs become mainstream. Packaging the infrastructure together with the business logic although only <1% changes is not reasonable in containerized environments and slow. Fast turnaround cycles are crucial for productivity. Developers infected with "Thin WAR" mindset thrive for Micro WARs with fast deployments. It is common in green field Java EE 7 projects to have WARs smaller than 1 MB.
- Microservices become just another solution for a problem and not a general architecture. It is perfectly fine to deploy a single, small, WAR containing everything: a macroservice / microlith.
- Serverless overuse: serverless architectures claim to safe costs and to simplify operations. This is not true for all use cases -- I expect first reports of failing serverless projects due additional implementation complexity and plumbing. However: combining "traditional" Thin WARs with serverless endpoints brings the best of both worlds together. Servers for the main load and functions for (infrequent) events.
- OpenLiberty could become the killer Java EE 8 / Java 9 application server. Small, lightweight and with interesting production features.
- SQL revival: Modern relational databases like e.g PostgreSQL will regain traction.
- JMS revival: there is a lack of popular common messaging API in microservice context. JMS 2.0 is just an API and could be implemented by many messaging services. JMS API with a "funky" implementation could (should) gain traction.
- I got the first requests about Java 9 modules within microservices. There should be a buzz around additional module complexity introduced with "premature modularization" in second half of 2018 (or earlier).
- Fat Clients are back: Service Workers, Cache API, Progressive Web (Offline) Apps, IndexedDB, "offline first" encourage developers to put more and more logic on the client. This is exactly how Fat Client is defined.
- Server Side Rendering (SSR): server side rendering is a viable architecture for SPAs / PWAs. Java Server Pages have a bad name, but are a fast and capable serverside templating technology with great tool support.
- Frameworks known from Java ecosystem like Vaadin Elements and Prime Elements become a popular WebComponent-compatible UI widget provider.
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