Speaker: Spencer Gibb

Twitter: @spencerbgibb

Link to table of contents

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History

• Spring 1 came out in 2004. Spring 5 came out in 2017 – included Java 8/11/17
• Spring Boot 1 released 2014 with Java 6 baseline. Spring Boot 2 released 2018 with Java 8 (baseline)/11/17. Now has 6 month release cycle to match Java
• Spring Cloud – launched 2015. last release in 2020. Started with wors *Angle, Brixton, etc). Switched to # release versions (2020)
• Josh Long’s favorite place on the internet is prod. Secon favorite is start.spring.io.

Spring 6

• corresponding libraries have version as well. e: Spring security, data
• Spring Boot 3 and Spring Cloud 2022.0. go with Spring 6
• Go to Spring Initializr (start.spring.io) if not sure what goes together

Java 17

• Baseline Java 17. Must hava Java17+ to run
• Will have compatability wihth Java 18, 19, etc

Jakarta EE 9

• Package renaming (javax -> jakarta)
• Tomcat 10/Jetty 11/Undertow 2.2
• JPA3 3 (Hibernate 6)

Native

• GraalVM compiles to native
• Faster startup, less memory usage
• Spring Native was an exeperimental project. AOT metadata processing moves to Spring Framework. Built time pugins move to Spring Boot. Type and resoures hints move to relevant projects
• Native pros – serverless, cost via lower resource consumption, CLI
• Native cons – less mature, no JIT

Observablity

• Introuced with Sleuth. 2021.0 will be last Sleuth release
• Now Micrometer tracing
• new Observation API
• Instrumentation moving to relevant projects
• Micrometer staying as Java 8 baseline

Declarative Clients

• Feign was part of spring-cloud-netflix and open sourced Now spring-cloud-openfeign
• Declarative blocking web service client
• Now in Spring framework
• Will add for GraphQL and RSocket (reactive sockets)

General

• API testing tool: https://httpie.io
• thenounproject.com – good collection of free stock art
• Logger creates a lazy version so doesn’t interpolate strings unless needed. Also, a supplier verson
• AutoConfiguration annotation to replace Configuration annotation
• Problem details – standard json format for error messages. Content type application/problem+json
• Removing a bunch of stuff. One is Freemarker JSP whch I didn’t know existed
• OSS Spring 5 supported until 2024

My take

Excellent outline making the content easy to remember. Which is good because there was a lot of infomration! The live coding was good for seeing the code based changes and also breaking up the information. I liked seing the ”upgrade” with the jakarta package names and the micrometer example

Speaker: Hillmer Chona & Rodrigo Graciano

Twitter @HillmerCh and @RodgrigoGraciano

Link to table of contents

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Anotations vs XML

• @EnableBatchProcessing automatically provides beans for job repo, job launcher, etc
• If use XML, need to create all beans yourself
• Don’t mix and match XML vs annotations. Could wind up with two of a bean

Concepts

• Steps – one reader/writer
• Job repository – provided by framework
• async doesnt block – JobLauncher vs AsyncJobLauncher
• Can run at the comand line or in web container
• Processors – transform, filter, validate
• Chunk – collect data and sent data on when chunk complete
• Many types of readers, and writers built in. Can also write own
• Listeners run before/after job
• Step listeners are more detailed
• Fault tolerance – skip exceptions
• Retries

Flows

• Conditional – exit status, run different step on success/fail.
• Decider – can have custom logic, not just exit status ex: day of week)
• Split – run steps in paralelel

Live demo

• Heavy use of chaining
• Yay! Records
• JobExecutionListener has two methdods beforeJob() and afterJob(). Alternatively, an put logic in parent job

My take

The keynote ran late and I didn’t make it in tie for the beginning. Luckily, I saw Rodrigo do a practice run so was able to jump in. Lots of information and presentation well designed for explaining concepts