What a technical team asks before migrating.

JFB 3.0 mixes interface, logic, and data in a single runtime. The target architecture separates those responsibilities into layers with clear contracts.

• Angular delivers a modern web interface, with reusable components and one uniform visual standard.
• Spring Boot concentrates business rules, transactions, and data access, exposed as a REST API.
• Typed contracts between layers: each part is tested, scaled, and evolved on its own.

Business behavior is preserved. What changes is where it lives — and how easy it is to maintain.

Packages that have worked for years are not rewritten for the sake of rewriting.

• Proven procedures are kept: Spring Boot calls them behind a business-oriented API.
• Oracle details stay isolated: typed data travels outward, never database internals.
• Only what adds value moves: a rule moves to Spring when it can be tested without Oracle and its equivalence verified.

Less risk today, and the freedom to decouple the database tomorrow.

Every trigger is classified by what it actually does, and that intent is implemented in the right layer.

• Navigation and interface → the Angular lifecycle.
• Validation → in the form to guide the user, and on the back end as the final authority.
• Transactions → Spring Boot services: committing is a business operation, not a button.

The result behaves like the original — and ends up documented and tested.

• Double validation: on the front end as a usability aid, on the back end as the rule that actually decides.
• Controlled exceptions: a global handler translates every failure into a clear, safe message.
• Structured logging: correlation identifiers to audit every operation end to end.

Disabling a button is never a security decision: security lives on the back end.

• No home-grown passwords: identity is managed by a specialized, certified provider.
• Short-lived tokens instead of fragile sessions: every request arrives signed and verifiable.
• Authorization per operation: the back end decides what each user can do, always.

More secure than the original scheme — and ready for corporate single sign-on (SSO).

• Angular: Jasmine, Karma, and TestBed for components and validators.
• Spring Boot: JUnit 5, Mockito, and MockMvc for business rules and the API.
• Integration: Oracle packages are tested against the real database, not against mocks.
• End-to-end: Playwright verifies complete flows exactly as the user experiences them.

The acceptance criterion is covering the original system’s behavior, not reaching a percentage.

• One artifact per layer: front end and back end are built and deployed independently.
• Promotion across environments: what reaches production is exactly what was already validated.
• Immediate rollback: every release keeps its predecessor ready to switch back.

Application and database deployments stay separate, each at its own pace and with its own control.

• Application development: Angular and Spring Boot on top of the architecture already defined.
• DevOps engineering: delivery pipeline, environments, and observability.
• Database specialist: steps in when Oracle behavior gets complex.

The hard part is not building screens: it is preserving the original system’s behavior and proving equivalence with tests. That is exactly what our methodology and our team are for.