# Root

## Overview

The root-level area appears to represent the top of a web application structure built around three integration namespaces: `com.fujitsu`, `eo.web`, and `javax.faces`. Taken together, these sub-packages suggest a system whose main responsibility is web-facing request handling, screen wiring, and Faces/servlet container integration rather than a single business domain.

Because the root index contains no directly captured source files, classes, or dependencies, this overview is synthesized from the documented child modules. Even so, the shape is clear: each child namespace owns a different layer of the web stack, and the system appears to rely on configuration-driven wiring to connect those layers.

## Sub-module Guide

### `com.fujitsu`

The `com.fujitsu` branch appears to be the container-facing integration side of the application. Its documented child package, `com.fujitsu.futurity`, provides servlet extension points that sit close to the runtime.

Within that area, the integration split is important:

- request-time behavior is handled by a servlet filter
- application-time behavior is handled by a servlet context listener

This separation suggests that `com.fujitsu` is responsible for hooking the application into the servlet container at two different levels. The filter is part of the live HTTP path, while the listener is part of startup and shutdown lifecycle management.

### `eo.web`

`eo.web` appears to be a page-oriented web wiring area. Its documented child module, `eo.web.webview`, contains a small pair of screen classes for ACA001:

- `ACA001SFBean` carries view state through a minimal `value` property
- `ACA001SFLogic` provides an execution hook, though its `execute()` method is currently empty

This relationship suggests a thin Java layer that supports framework-managed screen flow. The classes do not appear to implement the entire interaction themselves; instead, they are bound into the page flow through XML and JSP artifacts.

### `javax.faces`

`javax.faces` functions as the Faces-side namespace boundary. Its child package, `javax.faces.webapp`, exposes the servlet-level entry point for Faces processing through `FacesServlet`.

This package appears to represent the bridge between web deployment configuration and JSF-style request routing. The servlet is the key integration point, and `web-full.xml` appears to be the configuration artifact that wires it into the application.

### How the sub-modules relate

The three branches are complementary rather than redundant:

- `com.fujitsu` integrates the application with the servlet container itself.
- `eo.web` defines a screen-level Java adapter for page rendering and lifecycle hooks.
- `javax.faces` provides the Faces request-entry namespace and servlet bridge.

In other words, the root area appears to span the full chain from container hooks, to page-level state/logic, to JSF request routing. The modules do not look like peers implementing the same job; they represent different layers that cooperate through configuration and container callbacks.

## Key Patterns and Architecture

### Configuration-driven web integration

A consistent theme across the child modules is that behavior is wired externally rather than by direct code-to-code calls:

- servlet filters and listeners are container-managed in `com.fujitsu`
- screen logic and state are bound through XML and JSP in `eo.web`
- Faces request handling is attached through `web-full.xml` in `javax.faces`

This appears to be a classic descriptor-driven web application architecture. The Java classes provide integration points, while the deployment descriptors determine how those points are activated.

### Layered responsibility

The children separate concerns by runtime scope:

- **Lifecycle scope** — `X33AppContextListener`-style behavior belongs to startup and shutdown
- **Request scope** — filter behavior belongs to per-request processing
- **Screen scope** — `ACA001SFBean` and `ACA001SFLogic` belong to one page flow
- **Framework scope** — `FacesServlet` belongs to JSF request routing

That layered structure reduces coupling and keeps each module focused on a different phase of the web application lifecycle.

### Thin Java, heavy wiring

The documented classes are intentionally small or empty in the current snapshot. That suggests the repository may rely on framework conventions and XML wiring more than on large custom Java services. The Java code seems to act as the contract surface that the container and page framework call into.

```mermaid
flowchart TD
Root["Root"] --> ComFujitsu["com.fujitsu"]
Root --> EoWeb["eo.web"]
Root --> JavaxFaces["javax.faces"]
ComFujitsu --> Futurity["com.fujitsu.futurity"]
EoWeb --> Webview["eo.web.webview"]
JavaxFaces --> Webapp["javax.faces.webapp"]
Futurity --> Filter["Servlet filter"]
Futurity --> Listener["Servlet context listener"]
Webview --> Bean["ACA001SFBean"]
Webview --> Logic["ACA001SFLogic"]
Webapp --> FacesServlet["FacesServlet"]
Filter --> RequestFlow["Request processing"]
Listener --> LifecycleFlow["Application lifecycle"]
Bean --> ViewState["View state"]
Logic --> ScreenFlow["Screen execution"]
FacesServlet --> FacesFlow["JSF request routing"]
```

This diagram shows the root namespace as a set of integration layers rather than a single functional pipeline. The container hooks, screen wiring, and Faces entry point all participate in the same system, but at different points in the request and lifecycle flow.

## Dependencies and Integration

### External dependencies

The visible external integration points are standard web platform APIs and descriptors:

- Servlet API types for filters and listeners in `com.fujitsu`
- JSP and XML-driven screen wiring in `eo.web`
- JSF servlet integration in `javax.faces`
- `web-full.xml` as a deployment descriptor used by multiple child areas

These signals indicate dependence on the Java web stack rather than on a custom runtime. The container is responsible for invoking the relevant hooks.

### System integration points

The root area appears to connect to the rest of the system through deployment-time configuration:

- `com.fujitsu` integrates at the servlet container boundary
- `eo.web` integrates through page descriptors and JSPs
- `javax.faces` integrates through servlet mapping and JSF runtime startup

Because the index did not resolve direct package dependencies at this level, the safest interpretation is that the module acts as a web-facing integration shell. It provides entry points for the rest of the application rather than implementing core domain services itself.

## Notes for Developers

- Treat the three child namespaces as different layers of one web integration story, not as isolated feature areas.
- When changing request behavior, check whether the change belongs in the servlet filter, the Faces servlet mapping, or the screen logic class.
- When extending a page flow, update the XML and JSP wiring alongside the Java classes; the repository appears to depend heavily on configuration-based binding.
- The child classes are currently small or empty in the documentation snapshot, so verify implementation details before assuming they perform significant business work.
- Changes here can have broad runtime impact because they sit close to startup, routing, and request interception.
- If you are tracing a user journey end-to-end, start at deployment configuration, then follow the flow through servlet integration and screen-level hooks.