Bootiful Spring Boot 3

service

start.spring.io (postgres, testcontainers, data jdbc, web, actuator)
java 17
- 'technically superior' / 'morally superior'
configure java 21

java {
    sourceCompatibility = '21'
}

graalvmNative {

    binaries {
        main {
            buildArgs.add('--enable-preview')
        }
    }
}

java {
    toolchain { languageVersion = JavaLanguageVersion.of(21) }
}

repositories {
    mavenCentral()
    maven { url 'https://repo.spring.io/snapshot' }
    maven { url 'https://repo.spring.io/milestone' }
}

records
- 'look ma! no lombok!'
service
controller
this is pretty stock standard stuff. its been a while since weve talked. but things have definitely not stood still. lets pull in some AI.

implementation 'org.springframework.experimental.ai:spring-ai-openai-spring-boot-starter:0.2.0-SNAPSHOT'

we'll create a controller to tell a Dr. Seussian story about Spring Boot in the amazing city of $CITY_NAME
ok, are we done? can we go to production? i think not! we have to turn this into a production worthy app. there are some low hanging fruit we need to consider. first, that dr. seuss endpoint took forever. itll block progress because it's using a thread. lets take advantage of Project Loom. spring.threads.virtual...enabled=true
error handling
- show that the new code uses HttpServletRequest from jakarta.\*, not javax.\*
- this is because Oracle ghosted the community
- change is hard! now's a good time to clear the air on another major, breaking change in Sprng Boot 3: no more animated ASCII art! show the 2.7 feature turning this .gif into a banner
- now, granted, that feature isn't great for serverless...
controller advice
problem details
- show the RFC
observation
new unified Observation api
show tracing and metrics in actuator
buildpacks
aot + graalvm
- java is already amazing. did u know its ranked the 4th most energy effivient language after the likes of C and Go? Python's 70x less efficient!
- it owes its incredible speed to the garbage collector and JIT
- did you see this? the original Java garbage collector https://twitter.com/jtannady/status/981547257479778307?lang=en
- the JIT is amazing! it works by creating a closed world assumption of your apps. it needs to remove all fun. If it can do that, it can produce applications that fly
- but what happens when it has issues? somebody needs to provide that configuration! enter spring boot 3 aot engine
- kick off a build
aot native image builds takes a long time
- we asked them to play elevator music https://github.com/joshlong/bootiful-spring-boot-3/edit/main/README.md
- then look at the replies
client
reactive web, gateway, graphql
declarative http clients

joshlong/bootiful-spring-boot-3

Bootiful Spring Boot 3

service