Spring boot learning project

Learn Spring boot through examples

Java Style guide setup

• ./gradlew spotlessCheck - Check for Google Java Style
• ./gradlew spotlessApply - Apply Google Java Style changes

Java static analysis setup

Run SonarQube community server

docker run -d --name sonarqube -e SONAR_ES_BOOTSTRAP_CHECKS_DISABLE=true -p 9000:9000 sonarqube:community

Steps:

• Goto http://localhost:9000/
• Login using admin/admin
• Create project
• Create API Token and configure in build.gradle
• Run the following command

./gradlew sonar - Run sonar scanning

Protobuf Setup

Protocol Buffers (.proto files) are located in src/main/protobuf/ directory.

Generating Java Classes from .proto files

Prerequisites: Install Protocol Buffer compiler:

• macOS: brew install protobuf
• Ubuntu/Debian: sudo apt-get install protobuf-compiler
• Windows: Download from Protocol Buffers releases

Generate Java classes:

protoc --java_out=src/main/java --proto_path=src/main/protobuf src/main/protobuf/*.proto

Current proto files:

• user_message.proto - Defines UserMessage structure for Kafka messaging

Kafka Protobuf Integration:

• Producer endpoint: POST /send-protobuf
• Consumer automatically processes protobuf messages from user-protobuf-topic