https://github.com/fresult/gout-together
This project is for learning Java, Spring Boot from Java Backend Developer Boot Camp [2024] BY TP Coder
https://github.com/fresult/gout-together
java junit5 mockito mockmvc spring-boot spring-security spring-security-oauth2
Last synced: 3 months ago
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This project is for learning Java, Spring Boot from Java Backend Developer Boot Camp [2024] BY TP Coder
- Host: GitHub
- URL: https://github.com/fresult/gout-together
- Owner: fResult
- Created: 2024-11-12T20:18:40.000Z (7 months ago)
- Default Branch: main
- Last Pushed: 2025-01-25T20:36:34.000Z (4 months ago)
- Last Synced: 2025-01-25T21:24:34.368Z (4 months ago)
- Topics: java, junit5, mockito, mockmvc, spring-boot, spring-security, spring-security-oauth2
- Language: Java
- Homepage:
- Size: 716 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Gout Together Backend
This project is for learning Java, Spring Boot
from [Java Backend Developer Boot Camp \[2024\]](https://www.youtube.com/playlist?list=PLm3A9eDaMzukMQtdDoeOR-HbFN35vieQY)
BY [TP Coder](https://www.youtube.com/@tpcoder)
Course Code Example:
## API Usage
Download Postman Collection from the [Gout-Together.postman_collection.json](https://raw.githubusercontent.com/fResult/Gout-Together/refs/heads/main/Gout-Together.postman_collection.json) file, then import to your [Postman](https://www.postman.com/downloads).
```bash
# Download the Postman Collection to current (working) directory
curl -O https://raw.githubusercontent.com/fResult/Gout-Together/refs/heads/main/Gout-Together.postman_collection.json
# Download the Postman Collection to your specific directory
curl -o /path/to/your/target/directory/Gout-Together.postman_collection.json https://raw.githubusercontent.com/fResult/Gout-Together/refs/heads/main/Gout-Together.postman_collection.json
```
## Related commands
### Build Jar and Get the OpenTelemetry Agent
```bash
./gradlew clean build
```
### Environment Variables
#### Add Environment File
```bash
cp .envTemplate .env
```
#### Generate RSA Keypair
```shell
openssl genrsa -out src/main/resources/private_key.pem 4096
openssl rsa -pubout -in src/main/resources/private_key.pem -out src/main/resources/public_key.pem
openssl pkcs8 -topk8 -in src/main/resources/private_key.pem -inform pem -out src/main/resources/private_key_pkcs8.pem -outform pem -nocrypt
```
#### Assign Public/Private Key for Spring Security Config
```shell
base64 -i src/main/resources/private_key_pkcs8.pem # Then put the Base64 text to the `OAUTH_PRIVATE_KEY_BASE64` env var
base64 -i src/main/resources/public_key.pem # Then put the Base64 text to the `OAUTH_PUBLIC_KEY_BASE64` env var
```
### Start the application
#### In development mode with OpenTelemetry Java Agent
As we already declared the required environment variables in the `.env` file, we can start application with the
following
command.
```bash
./gradlew bootRun
```
Since this is for learning purpose, the environment variables in the `.env` file are:
```env
JAVA_TOOL_OPTIONS="-javaagent:build/agent/opentelemetry-javaagent.jar"
OTEL_SERVICE_NAME=gout
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317
OTEL_EXPORTER_OTLP_PROTOCOL=grpc
OTEL_RESOURCE_ATTRIBUTES="service.name=gout,service.instance.id=gout,env=dev"
# Logs are disabled by default
OTEL_LOGS_EXPORTER=otlp
OTEL_METRIC_EXPORT_INTERVAL=500
OTEL_BSP_SCHEDULE_DELAY=500
```
#### In Build mode with OpenTelemetry Java Agent
```bash
java -javaagent:build/agent/opentelemetry-javaagent.jar -jar build/libs/app.jar
```
### Visit to Grafana on local machine
-
## My Summary
### Things I learned from attending the course
- OpenTelemetry Java Agent
- Spring Security implementation
- Unit Testing with JUnit 5 and Mockito
- Configuring authorization with OAuth2ResourceServer
- Integration Testing
- Pessimistic Locking for data consistency
- Implementing idempotency keys to prevent duplicate transaction processing
### Things I did different and learned further
- Used the Gradle Kotlin instead of the Gradle Groovy
- PasswordEncoder: using Argon2PasswordEncoder instead of BCryptPasswordEncoder
- Added more assertion, including asserting error message in Unit Tests
- Resolved circular dependency using `@Lazy` annotation
- Implemented [Virtual Thread](https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html) and `CompletableFuture` for concurrent database operations
- See: [WalletServiceImpl.getConsumerAndTourCompanyWallets()](https://github.com/fResult/Gout-Together/blob/f4ef3ffebc4bee2ad9919b78996cfa1c659e484f/src/main/java/dev/fResult/goutTogether/wallets/services/WalletServiceImpl.java#L202-L224)
- Handled complex exception propagation in multi-threaded scenarios
- Implemented in [ErrorHelper.throwMatchedException()](https://github.com/fResult/Gout-Together/blob/f4ef3ffebc4bee2ad9919b78996cfa1c659e484f/src/main/java/dev/fResult/goutTogether/common/helpers/ErrorHelper.java#L24-L38)
- Applied in [service layer](https://github.com/fResult/Gout-Together/blob/f4ef3ffebc4bee2ad9919b78996cfa1c659e484f/src/main/java/dev/fResult/goutTogether/wallets/services/WalletServiceImpl.java#L225-L227)
- Created custom application properties
- Implemented in: [MyApplicationProperties.java](https://github.com/fResult/Gout-Together/blob/f4ef3ffebc4bee2ad9919b78996cfa1c659e484f/src/main/java/dev/fResult/goutTogether/common/configs/MyApplicationProperties.java)
- Applied in [SecurityConfig.java](https://github.com/fResult/Gout-Together/blob/34161612b0706213de18d278ebc5c15681c4b324/src/main/java/dev/fResult/goutTogether/common/configs/SecurityConfig.java#L52-L56)
### Test Coverage
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