Keynote

Original name

Keynote

Author(s)

Jiří Pinkas

Length

46:44

Date

12-11-2021

Language

Czech 🇨🇿

Rating

⭐⭐⭐☆☆

  • ✅ A nice and brief overview of the new and incoming technologies and upgrades as well as an overview of the usage statistics from various sources.

  • ⛔ Though it is nice to know which JRE/JDK distribution the speaker prefers, no technical reasoning was provided instead.

  • ⛔ So much hate towards MySQL but no explanation.

  • ⛔ It’s nice to know what offers a "killer feature", but what exactly it is? Next time less of hype, swag, and buzzwords, but more explanation.

"The Oracle Java is again available free of charge for production as of Java 17."

Usage statistics

  • Java version: Java 8 (37%), Java 11 (29%), Java 12 and newer (12%), Kotlin (8%), Groovy (6%), Java 7 and older (5%), Scala (3%)

  • JRE/JDK distribution: Oracle Java (36%), Generic OpenJDK (27%), AdoptOpenJdk (16%), Amazon COrretto (7%), Azul Zulu (6%), GraalVM (3%), Other (3%), OpenLogic JDK (2.3%)

    • The best distributions: Adoptium (Temurin) which is TCK certified and GraalVM for native applications.

    • The Generic OpenJDK has half-year validity only

    • Oracle Java is again available free of charge for production under the new "Oracle No-Fee Terms and Conditions" (NFTC) license that reverses a 2018 decision. This applies to the recently released version 17 of Oracle JDK and future versions.

  • Microservices: Currently transitioning to microservices (44%), We are talking about it (10%), Tried, didn’t work (2%)

  • Framework:

    • Spring Boot (74%), Other (18%), Quarkus (5%), Vert.x (2%), DropWizard (1%)

    • Spring-based: Spring Boot (90.6%), Spring MVC (51.8%), Java EE 29.4%, Quarkus (10.6%), Vaadin (9.4%), Jakarta EE (5.9%), JSF (5.9%), Struts (5.9%)

  • Virtual machine platform: Docker (41%), Kubernetes (26%), VMware (16%), N/A (10%), Other (4%), Vagrant (3%)

  • PaaS provider: ASW (31%), Undisclosed (24%), Azure (14%), Google Cloud Platform (11%), Other (8%), Oracle Cloud Platform (3%), IBS (3%), SAP (2%), Pivotal (2%), VMWare Tanzu (2%)

  • Application server: Tomcat (48%), JBoss (15%), Jetty (13%), Other (8%), WebLogic (7%), WebSphere (5%), GlassFish (4%)

  • Build tool: Maven (68%), Gradle (23%), Ant (6%), Other (3)

    • Though Gradle usage is raising, it needs to be used correctly and carefully, or it gets messy and complicated.

    • Spring Starter by default switched to Gradle from Maven

  • IDE: IntelliJ Idea (48%), Eclipse (24%), VSCode (18%), Netbeans (6%), Other (4%)

  • CI/CD: Jenkins (43%), GitHub Actions (16%), Other (13%), Bamboo (7%), TeamCity (4%), Circle CI (3%), Travis CI (10%), None (10%)

  • How many times do you commit code to CI/CD build per day: 1 time (22%), 2 times (16%), 3 times (18%), 4 times (9%), 5 and more times (35%)

  • Percent of GC algorithms:

    • Java 10 and older: SerialGC (22%), ParallelGC (19%), G1 (22%), CMC (21%)

    • Java 11 and newer: G1 (68%), SerialGC (33%), CMC (4%), ParallelGC (1%)

  • Database: PostgreSQL (34.4%), MySQL (26.9%), Elasticsearch (18.3%), Oracle (18.3%), MSSQL (14%), IBM DB2 (12.9%), MariaDB (12.9%), MongoDB (7.5%), None (6.5%), DynamoDB (4.3%), Other (4.3%), SQLLite (2.2%), Couchbase (1.1%), Firebase (1.1%)

Spring Boot 3

  • Spring Boot 3 runs on Java 17 (which is the minimum version required) and supports records.

  • New Micrometer for metrics and tracing, Spring Cloud Sleuth project becomes obsolete.

  • Java EE is no longer used in favor of Jakarta EE, which means no longer javax packages but the jakarta ones.

  • Spring Security 6 has a major change where SecurityChainFilter has to be used instead of WebSecurityConfigurerAdapter.

  • Spring Data JPA and Hibernate 6

  • AOT GraalVM support for native images making Spring Native obsolete as it was an experimental project, not it is supported out-of-the-box.

Java 18

  • Multiline String.

  • Switch Expressions.

  • Records.

  • Pattern Matching for instanceof.

  • Better NPE error messages.

  • Faster start-up and lower memory footprint.