# nrrajes/employee-app architecture

> Architecture diagram of the GitHub repository nrrajes/employee-app, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-13). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/nrrajes/employee-app
- Repository: https://github.com/nrrajes/employee-app

## Overview

#### Purpose and Entry Point
This is a Java/Spring Boot employee-management service, organized as a layered REST application with persistence. The executable bootstrap is `src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java`; Maven builds and runs it via `pom.xml`.

#### API Boundary
HTTP requests enter the controller layer at `src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java`. This is the application’s external boundary: it maps employee-oriented REST operations to service calls and returns API responses.

#### Business-Service Layer
`src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java` owns employee use-case orchestration between the HTTP API and persistence. This layer should contain validation, lookup/error handling, and CRUD workflow decisions rather than exposing repository behavior directly.

#### Domain Model
`src/main/java/com/nr/devops/employeeapp/model/Employee.java` represents the employee domain/persistence record. It is the primary data shape passed through controller, service, and repository layers.

#### Persistence Boundary
`src/main/java/com/nr/devops/employeeapp/repository/EmployeeRepository.java` is the data-access abstraction used by the service. It isolates the application from the underlying database and likely relies on Spring Data/JPA conventions configured through the application runtime.

#### Primary Flow
The main control path is:
`EmployeeController` → `EmployeeService` → `EmployeeRepository` → database.
Retrieved or saved `Employee` instances flow back through the same layers to the client. The controller/service boundary separates transport concerns from business logic; the service/repository boundary separates use cases from database operations.

#### Runtime and Deployment
The application runs on the Spring Boot JVM runtime. Base configuration is in `src/main/resources/application.yaml`; container-oriented overrides are in `src/main/resources/application-docker.yaml`. Container delivery is defined by `Dockerfile` and local multi-container execution by `docker-compose.yml`, implying an external database/service dependency supplied in Docker environments. CI/CD orchestration is represented by `Jenkinsfile`.

Main entry points: [`src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java`](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java) (Application bootstrap), [`docker-compose.yml`](https://github.com/nrrajes/employee-app/blob/main/docker-compose.yml) (Local stack), [`src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java`](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java) (Employee controller), [`src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java`](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java) (Employee service)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_app["Spring Boot application"]
  node_maven["Maven build<br/>[pom.xml]"]
  node_bootstrap{{"Application bootstrap<br/>Spring Boot entry point"}}
  node_controller["Employee controller<br/>REST API"]
  node_service["Employee service<br/>business service"]
  node_repository["Employee repository<br/>data access"]
  node_employee["Employee<br/>domain entity<br/>[Employee.java]"]
  node_base_config["Base configuration<br/>Spring configuration<br/>[application.yaml]"]
end

subgraph group_delivery["Container delivery"]
  node_docker_config["Docker configuration<br/>environment override"]
  node_dockerfile["Container image<br/>Docker build"]
  node_compose["Local stack<br/>Docker Compose<br/>[docker-compose.yml]"]
  node_jenkins["CI/CD pipeline<br/>Jenkins pipeline"]
end

node_database[("External database")]

node_maven -->|"builds and runs"| node_bootstrap
node_bootstrap -->|"initializes"| node_controller
node_base_config -.->|"configures"| node_bootstrap
node_docker_config -.->|"overrides config"| node_bootstrap
node_controller -->|"employee requests"| node_service
node_service -->|"persistence operations"| node_repository
node_repository -->|"reads and writes"| node_database
node_controller -->|"receives and returns"| node_employee
node_service -->|"applies workflows to"| node_employee
node_repository -->|"persists"| node_employee
node_dockerfile -->|"packages"| node_bootstrap
node_compose -->|"runs image"| node_dockerfile
node_compose -->|"provides dependency"| node_database
node_compose -.->|"uses"| node_docker_config
node_jenkins -->|"orchestrates build"| node_maven
node_jenkins -->|"orchestrates delivery"| node_dockerfile

click node_maven "https://github.com/nrrajes/employee-app/blob/main/pom.xml"
click node_bootstrap "https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java"
click node_controller "https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java"
click node_service "https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java"
click node_repository "https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/repository/EmployeeRepository.java"
click node_employee "https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/model/Employee.java"
click node_base_config "https://github.com/nrrajes/employee-app/blob/main/src/main/resources/application.yaml"
click node_docker_config "https://github.com/nrrajes/employee-app/blob/main/src/main/resources/application-docker.yaml"
click node_dockerfile "https://github.com/nrrajes/employee-app/blob/main/Dockerfile"
click node_compose "https://github.com/nrrajes/employee-app/blob/main/docker-compose.yml"
click node_jenkins "https://github.com/nrrajes/employee-app/blob/main/Jenkinsfile"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_maven,node_bootstrap,node_controller,node_service,node_repository,node_employee,node_base_config toneBlue
class node_docker_config,node_dockerfile,node_compose,node_jenkins toneAmber
class node_database toneNeutral
```

## Components

### Spring Boot application

- [Maven build](https://github.com/nrrajes/employee-app/blob/main/pom.xml): build · Builds and runs the application. · `pom.xml`
- [Application bootstrap](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java): Spring Boot entry point · `src/main/java/com/nr/devops/employeeapp/EmployeeAppApplication.java`
- [Employee controller](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java): REST API · Maps employee HTTP operations to service calls. · `src/main/java/com/nr/devops/employeeapp/controller/EmployeeController.java`
- [Employee service](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java): business service · Owns employee CRUD workflows and validation. · `src/main/java/com/nr/devops/employeeapp/service/EmployeeService.java`
- [Employee repository](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/repository/EmployeeRepository.java): data access · Spring Data/JPA persistence abstraction. · `src/main/java/com/nr/devops/employeeapp/repository/EmployeeRepository.java`
- [Employee](https://github.com/nrrajes/employee-app/blob/main/src/main/java/com/nr/devops/employeeapp/model/Employee.java): domain entity · Primary employee data shape. · `src/main/java/com/nr/devops/employeeapp/model/Employee.java`
- [Base configuration](https://github.com/nrrajes/employee-app/blob/main/src/main/resources/application.yaml): Spring configuration · `src/main/resources/application.yaml`

### Container delivery

- [Docker configuration](https://github.com/nrrajes/employee-app/blob/main/src/main/resources/application-docker.yaml): environment override · `src/main/resources/application-docker.yaml`
- [Container image](https://github.com/nrrajes/employee-app/blob/main/Dockerfile): Docker build · `Dockerfile`
- [Local stack](https://github.com/nrrajes/employee-app/blob/main/docker-compose.yml): Docker Compose · Runs the application with external services locally. · `docker-compose.yml`
- [CI/CD pipeline](https://github.com/nrrajes/employee-app/blob/main/Jenkinsfile): Jenkins pipeline · `Jenkinsfile`

### Other components

- **External database**: database · Provided as an external dependency in Docker environments.

## Connections

- Maven build → Application bootstrap: builds and runs
- Application bootstrap → Employee controller: initializes
- Base configuration → Application bootstrap: configures
- Docker configuration → Application bootstrap: overrides config
- Employee controller → Employee service: employee requests
- Employee service → Employee repository: persistence operations
- Employee repository → External database: reads and writes
- Employee controller → Employee: receives and returns
- Employee service → Employee: applies workflows to
- Employee repository → Employee: persists
- Container image → Application bootstrap: packages
- Local stack → Container image: runs image
- Local stack → External database: provides dependency
- Local stack → Docker configuration: uses
- CI/CD pipeline → Maven build: orchestrates build
- CI/CD pipeline → Container image: orchestrates delivery