spring-boot3-updates: A Java repository from Lviv JavaClub

Agenda:

NOTE: All demo sue Spring Boot 3.2.0 and Java 21 and 17(CRaC)

New Clients: JdbcClient && RestClient (new-clients)
- Run postgres db:

docker run --name demo_postgres \
-d --rm -p 5433:5432 \
-e POSTGRES_PASSWORD=postgres \
--health-cmd "pg_isready -U postgres" \
--health-interval=10s \
--health-timeout=10s \
--health-retries=5 \
postgres:14-alpine

* Create database:

docker exec -it demo_postgres \
psql -U postgres -d postgres -c "create database spring_boot_updates_db"

Supports project Loom: Virtual threads for Spring Boot v3.2.0 (loom-support)

Support CRaC: Coordinated Restore at Checkpoint (crac-support)

Build an app

mvn clean package -DskipTests && \
docker build -t crac-demo .

run with privilege

  docker run -it --rm --privileged -p 8889:8888 --name crac-demo crac-demo

run java in container

  java -XX:CRaCCheckpointTo=/opt/crac-files -jar /opt/app/crac.jar

open new terminal, and execute docker image with crac ( check start time, ~ 2.2 sec)
```
 docker exec -it crac-demo bash
```
run java command for call checkpoint using PID of app

    # ( 9 in this example is PID)
    jcmd 9 JDK.checkpoint

for start killed checkpoint need to run next command ( check start time, ~ 280ms sec)

     java -XX:CRaCRestoreFrom=/opt/crac-files/

Improvements for Security with SSL (ssl-improvements)

Release in v3.1.1 spring bundle
Create self-signed certs for demo

    openssl req -x509 -subj "/CN=javaclub-demo" -keyout javaclub.key -out javaclub.crt -sha256 -days 365 -nodes -newkey ed25519

Resources:

lvivJavaClub/spring-boot3-updates

Agenda: