Developing Applications for the Java EE 7 Platform Ed 1 — Lesson 3: Servlets, JSP, JSF, and WebSocket Interfaces

Technical Scope

• servlet lifecycle, filters, listeners, sessions, multipart requests, and async processing
• JSP expression language, tag libraries, MVC boundaries, and view safety
• JSF component tree, navigation, converters, validators, Ajax, and state management
• WebSocket endpoints, concurrency, broadcasting, authentication, and browser diagnostics

Instructor Demonstration

The instructor models servlet lifecycle, filters, listeners, sessions, multipart requests, and async processing, then connects it to JSP expression language, tag libraries, MVC boundaries, and view safety. The demonstration captures the exact configuration, transaction, command, query, log, or screen evidence needed to prove intended behavior and the applicable control boundary.

Applied Workshop

Learners work through a role-based scenario involving JSP expression language, tag libraries, MVC boundaries, and view safety and JSF component tree, navigation, converters, validators, Ajax, and state management. The exercise introduces a realistic exception related to WebSocket endpoints, concurrency, broadcasting, authentication, and browser diagnostics and requires a reversible correction supported by before-and-after evidence.

1. Confirm scope, identities, data, dependencies, controls, and expected result.
2. Perform the product-specific configuration or analysis and record exact steps.
3. Validate functional behavior, security, data integrity, and operational observability.
4. Introduce the defined failure condition, diagnose the cause, and apply a safe correction.
5. Document rollback, acceptance evidence, unresolved risk, and ownership.

Validation Standard

Acceptance requires accurate handling of JSF component tree, navigation, converters, validators, Ajax, and state management, traceable proof for servlet lifecycle, filters, listeners, sessions, multipart requests, and async processing, and a repeatable recovery path for WebSocket endpoints, concurrency, broadcasting, authentication, and browser diagnostics. Results must be understandable to both implementers and operational support teams.

Failure Analysis

Learners compare symptoms, logs, state, dependencies, and recent changes when WebSocket endpoints, concurrency, broadcasting, authentication, and browser diagnostics occurs. The final diagnosis must separate the immediate fix from the preventive control.

Practical Outcome

The completed output is a tested servlets, jsp, jsf, and websocket interfaces implementation or analysis, with validation evidence, troubleshooting notes, rollback guidance, and a concise operational handover.