From interface to database

Authentication, business rules, and persistence in one Spring Boot application.

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Click to trace a request
  1. Angular Client

    Initiates the request

  2. Spring Security

    Authentication & authorization

  3. Controller / Service

    Spring Boot business rules

  4. Spring Data JPA

    Repository persistence

  5. PostgreSQL

    Relational data storage

Request & response

Follow one illustrative request through the verified application layers, then back to the client. No live data or API call is used.

What each layer does

  1. Angular Client

    The Angular interface initiates an API request. Frontend permissions help navigation; the server independently decides access.

  2. Spring Security

    The JWT authentication filter establishes identity. Endpoint and method-level checks enforce permissions; data access remains scoped to the authenticated user.

  3. Controller / Service

    Controllers expose HTTP endpoints. Services apply business rules and define transaction boundaries where needed.

  4. Spring Data JPA

    Spring Data repositories and Hibernate translate persistence operations. Queries, transaction boundaries and explicit locking support the workflow.

  5. PostgreSQL

    PostgreSQL stores business records. The application receives results through the repository and service layers, then returns an HTTP response to the client.

A conceptual trace of the repository’s current layers. Specific endpoints can take different paths. Inspect the source