# Repository Overview

Welcome to the **Futurity** codebase! This repository contains the core modules of a Java EE web application built for Fujitsu. It follows a classic enterprise architecture, combining JSF (JavaServer Faces), Struts 1.x, and the Servlet API to deliver a component-based web frontend — primarily targeting Japanese-language deployments (evidenced by Shift-JIS encoding scaffolding and Japanese-named view pages). Below is a high-level guide to help you orient yourself and start contributing.

## Overview

This project is a Java EE web application called **Futurity**. It provides a set of web view modules, servlet filters, and application lifecycle listeners that together form the presentation and request-processing layer of the system. The application is deployed as a standard WAR file and relies on a `web-full.xml` deployment descriptor to configure its servlets, filters, and listeners.

The codebase is still in an early or scaffolded state: several classes are stubs or minimal placeholders, awaiting implementation of their business logic. This is typical of a working tree used during active development or as a shared base across a team.

## Technology Stack

| Layer | Technology | Notes |
|-------|-----------|-------|
| **Runtime** | Java EE / Jakarta EE | Servlets, JSP, and JSF APIs |
| **Web Framework** | JavaServer Faces (JSF) | Entry via `FacesServlet` in `javax.faces.webapp` |
| **MVC Framework** | Struts 1.x | Action-based request handling via XML mappings |
| **Filter Chain** | Servlet Filter API | Request encoding and preprocessing |
| **View Layer** | JSP / Facelets | Server-side rendered HTML pages |
| **Character Encoding** | Shift-JIS (scaffolded) | Encoding filter present but not yet active |

No well-known third-party frameworks (Spring, Hibernate, etc.) were detected from import analysis. The stack is primarily Java EE APIs and the Struts/JSF frameworks.

## Architecture

The application follows a layered web architecture. Here is a high-level diagram showing how the main modules relate:

```mermaid
flowchart TD
    XML["web-full.xml<br/>deployment config"] --> FILTER["X33 Filter<br/>encoding layer"]
    XML --> SERVLET["FacesServlet<br/>JSF entry point"]
    XML --> CONFIG["Struts XML config"]
    FILTER --> ENC["X33JVRequestEncodingSjisFilter"]
    SERVLET --> JSF["JSF Lifecycle"]
    CONFIG --> LOGIC["ACA001SFLogic"]
    CONFIG --> BEAN["ACA001SFBean"]
    ENC --> XML
    LOGIC --> BEAN
```

**How to read this diagram:**

- **`web-full.xml`** is the central deployment descriptor. It registers the X33 filter, the FacesServlet, and Struts action mappings.
- The **X33 Filter** module sits at the edge of the request pipeline, handling character encoding for incoming HTTP requests.
- **FacesServlet** is the JSF entry point — all requests matching the JSF URL pattern flow through it into the JSF lifecycle.
- **Struts XML config** drives the MVC flow for the ACA001SF view: the logic class (`ACA001SFLogic`) processes the request and populates the data bean (`ACA001SFBean`), which the JSP views then render.

## Module Guide

### com.fujitsu.futurity.web.x33.filter

This package sits at the web layer of the application, acting as a Servlet Filter entry point for incoming HTTP requests. It contains the class `X33JVRequestEncodingSjisFilter`, which implements `javax.servlet.Filter` and is mapped in `web-full.xml`. Despite its name suggesting Shift-JIS encoding handling for Japanese input, the implementation is currently a no-op — it delegates every request to the next filter without setting any character encoding.

**Key class:**

- **X33JVRequestEncodingSjisFilter** — The sole filter in the package. It implements the standard `Filter` interface (`doFilter`, `init`, `destroy`) but performs no actual work at this time. It is expected to set request encoding to Shift-JIS once implemented.

See also: [Filter module detail](com/fujitsu/futurity/web/x33/filter.md)

### com.fujitsu.futurity.web.x33.listener

This package serves as the listener namespace for the X33 module. It currently contains a single stub class, `X33AppContextListener`, which appears to be a placeholder for future servlet context listeners (e.g., startup/shutdown hooks) that may be added as the X33 module evolves.

**Key class:**

- **X33AppContextListener** — An empty class named following the conventional Java EE pattern for servlet context listeners. It does not implement any interface or declare any methods today. Engineers can extend this class to implement `ServletContextListener` and register startup/shutdown hooks.

See also: [Listener module detail](com/fujitsu/futurity/web/x33/listener.md)

### eo.web.webview.ACA001SF

This subpackage provides a simple MVC-style Struts component consisting of a **bean** (the data carrier) and a **logic class** (the action handler). It appears to be a scaffold for a view page in the Futurity web application, wired through Struts XML configuration (`WEBGAMEN_FULL_ACA001.xml`). The view is consumed by multiple JSP pages, including ones with Japanese naming conventions (e.g., `ShiftJis001.jsp`).

**Key classes:**

- **ACA001SFBean** — A simple JavaBean holding a single `String value` field. Serves as the model object exposed to JSP view pages.
- **ACA001SFLogic** — The Struts action handler that processes requests for this view. Its `execute()` method is currently an empty stub.

See also: [ACA001SF module detail](eo/web/webview/ACA001SF.md)

### javax.faces.webapp

This subpackage is part of JavaServer Faces (JSF), the Java EE framework for building component-based user interfaces. It provides the `FacesServlet` class, which is the entry point that allows a JSF application to be deployed as a standard Java EE web application. It is declared in `web-full.xml` and receives all incoming HTTP requests, dispatching them through the JSF request processing lifecycle (RestoreView, ApplyRequestValues, ProcessValidations, UpdateModelValues, InvokeApplication, RenderResponse).

**Key class:**

- **FacesServlet** — The core servlet for any JSF application. In this repository, it appears as a minimal stub; in a production JSF runtime (e.g., Mojarra, MyFaces), this class is provided by the JSF library and orchestrates the entire six-phase request lifecycle.

See also: [webapp module detail](javax/faces/webapp.md)

## Getting Started

If you are new to this codebase, here is a recommended reading order to build your mental model:

1. **`web-full.xml`** — Start with the deployment descriptor. It tells you how everything is wired together: which servlets are registered, which filters are in the chain, and what URL patterns they match.

2. **`javax.faces.webapp` (FacesServlet)** — Read the JSF entry point. Understanding how `FacesServlet` receives and dispatches requests will help you follow the flow of any JSF-driven page in the application.

3. **`com.fujitsu.futurity.web.x33.filter` (X33JVRequestEncodingSjisFilter)** — Review the filter that sits at the edge of the request pipeline. Even though it is a no-op today, it is a good example of how the application intends to handle character encoding for Japanese requests.

4. **`eo.web.webview.ACA001SF` (ACA001SFBean, ACA001SFLogic)** — Examine this Struts MVC module to understand the pattern used for view pages: how the XML configuration wires the logic class to the bean, and how JSP views consume the bean's data.

5. **`com.fujitsu.futurity.web.x33.listener` (X33AppContextListener)** — Finally, peek at the listener stub. When the X33 team adds initialization logic, it will go here.

**Where entry points live:**

- **Filter entry:** `com.fujitsu.futurity.web.x33.filter.X33JVRequestEncodingSjisFilter`
- **JSF entry:** `javax.faces.webapp.FacesServlet`
- **Struts action:** `eo.web.webview.ACA001SF.ACA001SFLogic`
- **App context:** `com.fujitsu.futurity.web.x33.listener.X33AppContextListener` (stub)

**Configuration files to know:**

- `web-full.xml` — Primary deployment descriptor (servlets, filters, listeners)
- `WEBGAMEN_FULL_ACA001.xml` — Struts action mapping for the ACA001SF view