# Root

## Overview

The root of this codebase represents a **Java EE web application** — the **Futurity application** — built for the Japanese market. At the top level, there are no source files, classes, or methods directly indexed; instead, the entire implementation is organized under three top-level sub-packages that each govern a different layer of the web application stack:

- **`com.fujitsu.futurity`** — The application's own namespace, containing the X33 Japanese-market integration layer (character encoding filters, lifecycle listeners, deployment descriptor wiring).
- **`eo.web`** — The application's hand-written presentation layer, using JSP pages, JavaBeans, and controller classes in a Struts-style MVC pattern for page rendering.
- **`javax.faces`** — The JavaServer Faces (JSF) framework runtime, providing a component-based MVC alternative with a six-phase lifecycle, server-side component trees, and Front Controller servlet dispatch.

Together, these three packages span the full request-to-response pipeline: incoming HTTP traffic is intercepted and encoded by the `com.fujitsu` filter layer, then routed either to the Struts-style JSP views under `eo.web` or through the JSF lifecycle managed by `javax.faces.webapp`. The codebase appears to be in an early or scaffold stage — much of the implemented behavior consists of class scaffolding, stub methods, and registration declarations rather than production-ready logic.

## Sub-module Guide

The root module has no direct source files or classes. All functionality is delegated to three child packages, each of which owns a distinct concern in the web stack.

### `com.fujitsu.futurity` — Application Namespace and X33 Web Integration

This is the application's top-level package, hosting the **X33 integration subsystem** — a Japanese-market web component requiring Shift-JIS (MS932) character encoding. It contains a `web` sub-package with a `x33` slice that provides:

- A **request encoding filter** (`X33JVRequestEncodingSjisFilter`) designed to intercept incoming HTTP requests and enforce Shift-JIS encoding. Currently a pass-through no-op.
- A **servlet context listener stub** (`X33AppContextListener`) intended for application startup/shutdown lifecycle management. Currently unimplemented.
- A **deployment descriptor** (`web-full.xml`) that declaratively registers these components with the servlet container.

This package represents the **outermost web-facing boundary** — the first point of contact for external HTTP traffic to the X33 subsystem. It delegates inward to downstream business logic once processing is complete.

### `eo.web.webview` — Struts-Style JSP Presentation Layer

This sub-package implements the hand-written view layer using a **Bean-Logic MVC pattern**:

- **Bean** classes (e.g., `ACA001SFBean`) carry page-ready data via scoped JavaBeans accessed through `<jsp:useBean>`.
- **Logic** classes (e.g., `ACA001SFLogic`) act as controllers, receiving requests and orchestrating processing.
- **JSP view pages** read bean properties and render HTML responses.

The `ACA001SF` sub-module within `webview` is the most widely consumed component, referenced by five distinct JSP pages and one XML configuration file. Its Bean-Logic pairing is the template that new screen modules should follow.

This layer operates as a **self-contained presentation tier** with no Java package-level imports beyond `java.lang.String` and the JSP/Servlet API. Any downstream business logic would flow through `Logic.execute()` methods once they are implemented.

### `javax.faces.webapp` — JSF Front Controller and Lifecycle

This sub-package provides the **JavaServer Faces framework integration**, centered on `FacesServlet` — a Front Controller servlet that routes all JSF-managed requests through a fixed six-phase lifecycle (Restore View, Apply Request Values, Process Validations, Update Model Values, Invoke Application, Render Response).

This is the **structural bridge** between the servlet container and the JSF component model. It depends on core JSF runtime classes in sibling subpackages (`javax.faces.context`, `javax.faces.lifecycle`, `javax.faces.component`, etc.) and is configured via initialization parameters in `web-full.xml`.

### How the Sub-modules Relate

These three sub-packages govern three **parallel approaches** to web presentation within the same application:

| Dimension | `com.fujitsu.futurity.web` | `eo.web.webview` | `javax.faces.webapp` |
|---|---|---|---|
| Role | Encoding + lifecycle scaffolding | Hand-written JSP views | JSF framework runtime |
| Pattern | Filter + Listener | Bean-Logic MVC (Struts-style) | Front Controller + 6-phase lifecycle |
| State management | None (stateless filter) | Scoped beans (`<jsp:useBean>`) | Server-side component tree |
| Current maturity | Stub/scaffold | Scaffold with multi-page consumers | Framework integration |

The three packages do not directly import each other's classes. Instead, they occupy different **conceptual layers** that together form the application's web stack:

```mermaid
flowchart LR
    Client["Client Browser"] --> webTier["Web Entry Point"]
    webTier --> com["com.fujitsu.x33 Filter
(Shift-JIS Encoding)"]
    webTier --> eo["eo.web JSP Views
(Bean-Logic MVC)"]
    webTier --> jsf["javax.faces FacesServlet
(JSF Lifecycle)"]
    com -->|"routes to"| internal["Backend Subsystems"]
    eo -->|"delegates to"| internal
    jsf -->|"invokes"| internal
```

The `com.fujitsu` encoding filter sits at the outermost edge, processing every request before it reaches either the `eo.web` JSP views or the `javax.faces` JSF lifecycle. The two presentation layers (`eo.web` and `javax.faces`) appear to represent **complementary or transitional approaches** to rendering — the Struts-style JSP/bean pattern and the component-based JSF model — with neither having fully displaced the other.

## Key Patterns and Architecture

### Scaffolding as a Recurring Theme

A dominant theme across all three sub-packages is the **placeholder/scaffold pattern**. Class names, package structures, and XML registrations are in place across the codebase, but the actual behavioral implementation is often empty:

- The X33 encoding filter (`X33JVRequestEncodingSjisFilter`) delegates directly to the filter chain without applying any encoding.
- The X33 lifecycle listener (`X33AppContextListener`) is an unimplemented stub with no interface or registration.
- The `ACA001SFLogic.execute()` method is an empty no-op.
- The `ACA001SFBean` exposes a getter but lacks a setter.

This suggests the application is either in an early greenfield phase, or the behavioral logic has been deferred to a later implementation sprint.

### XML-Declarative Wiring

The codebase consistently favors **declarative configuration over annotation-based wiring**:

- The `com.fujitsu` filter is registered in `web-full.xml` rather than via `@WebFilter`.
- The `eo.web` beans and logic classes are declared in XML configuration files (`WEBGAMEN_FULL_ACA001.xml`) and referenced by JSP pages through `<jsp:useBean>`.
- The `javax.faces` FacesServlet and its initialization parameters are configured in `web-full.xml`.

This reflects the application's use of a traditional Java EE deployment model where the deployment descriptor is the authoritative source for servlet and bean wiring.

### Three Web Paradigms in One Application

The root package encapsulates **three distinct web paradigms** coexisting within the same application:

1. **Servlet Filter Chain** (`com.fujitsu`) — Imperative, request-scoped, chain-based processing for cross-cutting concerns like encoding.
2. **JSP + JavaBeans MVC** (`eo.web`) — Scripting-based views with explicit controller classes, reminiscent of early Struts applications.
3. **Component-Based JSF** (`javax.faces`) — Server-side component trees with a declarative, lifecycle-driven request model.

This mixture suggests the application may be in a **migration phase** (transitioning from JSP/Struts toward JSF), or that different teams or eras of development left their mark on the architecture. In any case, developers working in any one of these areas should be aware of the others — changes to `web-full.xml`, for example, may affect all three paradigms simultaneously.

### Request Flow Overview

When fully implemented, the request flow through the root application would proceed as follows:

```mermaid
flowchart TD
    subgraph External["External"]
        client["Browser / Client"]
    end
    subgraph Servlet["javax.faces.webapp"]
        servlet["FacesServlet"]
        lifecycle["JSF 6-Phase Lifecycle"]
        stateMgmt["View State Mgmt"]
    end
    subgraph Internal["Internal Packages"]
        com["com.fujitsu.futurity.web
(X33 Encoding)"]
        eo["eo.web.webview
(JSP + Bean-Logic)"]
    end
    subgraph Data["Data Layer"]
        beans["JavaBeans /
Managed Beans"]
        logic["Logic Classes"]
    end
    client -->|"HTTP Request"| servlet
    servlet -->|"dispatches to"| lifecycle
    lifecycle -->|"Restore View"| stateMgmt
    stateMgmt -->|"Restored"| lifecycle
    lifecycle -->|"Render Response"| com
    lifecycle -->|"Render Response"| eo
    com -->|"delegates to"| beans
    eo -->|"uses"| beans
    eo -->|"invokes"| logic
    beans -->|"return data"| com
    beans -->|"return data"| eo
```

The FacesServlet in `javax.faces.webapp` receives the initial HTTP request and dispatches it through the JSF lifecycle. At the appropriate phase, the request may delegate to the `com.fujitsu` encoding filter (if the X33 subsystem is involved) or to the `eo.web` JSP views for rendering. The Bean-Logic pattern in `eo.web` then provides scoped data through JavaBeans and orchestrates processing through Logic classes.

### Thread Safety and State

- The `com.fujitsu` filter is **inherently thread-safe**: it holds no instance fields and is entirely stateless.
- The `javax.faces` FacesServlet is **thread-safe by design**: the container creates a single instance handling all requests concurrently, with per-request `FacesContext` instances.
- The `eo.web` beans are **scoped** (request, session, or page scope), meaning their thread safety depends on the scope chosen — request-scoped beans are naturally safe, while session-scoped beans require careful synchronization if accessed concurrently.

## Dependencies and Integration

### External Dependencies

| System | Used By | Role |
|--------|---------|------|
| `javax.servlet` API | `com.fujitsu`, `javax.faces` | Servlet container integration |
| JSP/Servlet API | `eo.web` | View rendering and scoped bean access |
| JSF framework runtime | `javax.faces` | Component model, lifecycle, validation, conversion |
| Servlet Container (Tomcat, Jetty, etc.) | All three | Runtime hosting and lifecycle management |
| Facelets (`.xhtml`) | `javax.faces` | Modern JSF 2.x+ view technology |

### Internal Relationships

No direct Java package-level imports were detected between the three sub-packages. Each operates as an **independent subsystem** at the package level:

- `com.fujitsu` is a **leaf module** — it receives external traffic and delegates inward but does not import other application packages.
- `eo.web` is **self-contained** — it depends only on `java.lang.String` and the JSP/Servlet API at the package level.
- `javax.faces` depends on sibling subpackages within the `javax` namespace (`javax.faces.context`, `javax.faces.lifecycle`, `javax.faces.component`, etc.) for its runtime classes.

The absence of inter-package imports suggests the web layer is designed as a **thin presentation facade** that sits above business-logic and data-access layers not yet captured in the index.

### Cross-Module Integration Points

- **`web-full.xml`** — The shared deployment descriptor that wires components across all three sub-packages (filter registration, FacesServlet mapping, init parameters).
- **`javax.servlet`** — The common API surface that all three packages use for request/response handling.
- **Character encoding** — A shared concern: the X33 filter (`com.fujitsu`) targets Shift-JIS (MS932), the JSP pages in `eo.web` include files named `ShiftJis001.jsp`, and JSF can also be configured for character encoding via init parameters.

## Notes for Developers

### Encoding Needs Immediate Attention

The `X33JVRequestEncodingSjisFilter` in `com.fujitsu` does not apply any character encoding. Given that the X33 subsystem serves Japanese users with multi-byte (Shift-JIS / MS932) input, requests may arrive with corrupted characters. Before this filter is used in production, it should either:

1. Implement `req.setCharacterEncoding("MS932")` before `chain.doFilter(...)`, or
2. Delegate encoding to a site-wide `CharacterEncodingFilter`, or
3. Be removed entirely if encoding is handled elsewhere.

### Scaffolding Is Ubiquitous

Nearly every class and method across all three sub-packages is a stub or placeholder. Before implementing behavior in any of these areas:

1. Verify with the team whether the feature is still planned.
2. Confirm whether application-wide mechanisms (e.g., Spring-based encoding, global lifecycle beans) have superseded the scaffolding.
3. Follow the existing patterns when filling in implementations — XML-declarative wiring, Bean-Logic separation, and the JSF lifecycle phases.

### Wide JSP Surface Area

The `ACA001SFBean` component in `eo.web` is consumed by five distinct JSP pages. Any changes to its API should be validated against all consumers. Similarly, `ACA001SFLogic` is referenced by `FULL_ACA001010PJP.jsp` — a change to its method signature would require updating the calling page.

### JavaScript File Server Reference

The codebase contains a reference to a file server (`full-fixture-codebase/koptWebA/WebContent`) that appears to serve static assets or additional web resources. Developers working on the web layer should be aware of this external resource location.

### Three Paradigms to Navigate

When making changes, be aware that this codebase uses three overlapping web paradigms:

- **Servlet Filters** (`com.fujitsu`) — For cross-cutting, request-scoped concerns.
- **JSP + JavaBeans** (`eo.web`) — For hand-crafted page rendering.
- **JSF** (`javax.faces`) — For component-based, lifecycle-driven rendering.

Changes to shared infrastructure (like `web-full.xml` or character encoding) may affect all three simultaneously. Coordinate across teams or contexts before modifying wiring or encoding configuration.