java | Spring boot | microServices | kafka | rmq | spring-batch | SpringAI 🤖 | leetcode

🔰2012-2024

✔️Java7 -java21

• java evolution - project and Notes
• Java 7 README.md
• Java 8 README.md
• Java 11 README.md
• Java 17 README.md
• Java 21 README.md
• Java 25 README.md

✔️SpringBoot project

• Spring_01_AOP
• Spring_02_Core
• Spring_03_Properties
• Spring_04_AutoConfiguration
• Advance javaSpringApp - Async etc
• Spring-Batch | Notes 📚 | Project
• Spring-Cloud (microservices-old-project) | Notes 📚 | project

✔️micro-services project/s

BasicWebApp | 📚Notes

jewelleryApp, README.md

• restApi(no DB, h/c), swagger doc, servlet, webServer, jackson, error handling, caching response, etc

courseApp, README.md

• h2, hibernate more, txn, tuple, pagination, etc

✔️RabbitMQ-projects

• environment Setup: Run Docker docker for RMQ + Management console:
• docker run -d --hostname my-rmq --name some-rabbit -p 5672:5672 -p 15672:15672 rabbitmq:3-management
• App1 - Producer/Consume | README.md

---

🔰2025

✔️Misc , check here

✔️Kafka-projects

• 📚 Notes
• Environment Setup: README_env_setup.md
• App1 - Producer/Consumer API + Avro schema | README.md
• App2 - KafkaStream API + JsonSerde | README.md

✔️micro-services project/s

• SecurityApp
  • OAuth2, okta, jwt, basic
  • README.md | 📚Security Notes
• modernWebApp 🔴
  • shoppingApp README.md - ASGI, Async, websocket, grpc
  • stockApp README.md - streaming, modulith, temporal
  • communication pattern: rest, grpc, websocket, messaging (kafka), rmq
  • k8s Helm | Deployment steps https://github.com/lekhrajdinkar/microservice-java/blob/main/helm/readme.md
• observabilityApp 🔴
  • README.md
  • otel, aws-x-rays

---

🔰2026

In-progress:

• Java 25 README.md 🔴
• SpringAI 02_01_SpringAI-start.md 🔴

---

▶ Side Notes

--spring.config.location=classpath:/custom-config.properties
--spring.config.additional-location=classpath:/custom-config.properties

--spring.profiles.active=dev

👉 Priority Rule:
Order of property resolution (highest wins):
  Command-line args (--key=value)
  spring.config.location file(s)
  spring.config.additional-location file(s)
  application-{profile}.properties
  application.properties

• Set/update java Runtime

#1 pom.xml
<properties>
   <java.version>21</java.version>
   <maven.java.version>21</maven.java.version>
</properties>

#2  InteliJ    
- File → Project Structure → SDKs
- Set this as Project SDK and Module SDK
- In Settings → Build, Execution, Deployment → Compiler → Java Compiler, ensure:
    Use compiler: javac
    Target bytecode: 25 (or lower if compatibility needed)
- Check java version on runtime config for each app and validate java
- use maven wrapper > update it for InteliJ

# maven warpper
- [toolchains.xml](.mvn/toolchains.xml) > update hardcoded java path

---cmd-----
mvn clean compile
mvn -v
java -version
javac -version

--- Status--- (as of Sep 2025) 
java 21 : working ✔️
java 23 : Lombok not supported ❌
java 25 : Maven not supported ❌

--- More
- <!-- 🔶 Security --> comment this part in pom.xml(root)