# Repository Overview

Welcome to the Futurity X33 web application codebase! This repository contains a Java EE web application built for the Futurity product line, targeting the Japanese market. It follows a traditional multi-tier Java EE architecture with a servlet-based web layer, a JSF front controller for view rendering, and an MVC pattern where logic classes coordinate with backing beans and JSP views. The codebase appears to be a component of a larger enterprise suite, with dedicated modules for character encoding (Shift JIS) and application lifecycle management. If you're new here, this page will orient you to the structure, the key modules, and the recommended reading order.

## Overview

This project is a Java EE web application that powers the Futurity X33 platform. It uses JavaServer Faces (JSF) as its primary UI framework, with a Servlet Filter layer for request encoding, a context listener for application bootstrap, and a modular MVC pattern for individual view pages. The application appears to support Japanese-language output, as indicated by the presence of Shift JIS encoding logic and the `X33JV` naming prefix (where "JV" likely stands for "Japan").

At a high level, the flow of a web request looks like this:

1. An HTTP request enters the servlet container.
2. A servlet filter (if active) may set the request character encoding.
3. The `FacesServlet` dispatches the request through the JSF lifecycle.
4. A logic class (e.g., `ACA001SFLogic`) processes the request and populates a backing bean.
5. A JSP view renders the response using the bean's data.

## Technology Stack

| Category | Technology |
|---|---|
| Language | Java (Java EE) |
| Web Framework | JavaServer Faces (JSF) via `javax.faces.webapp` |
| Servlet API | `javax.servlet.*` |
| Configuration | XML deployment descriptors (`web-full.xml`, `WEBGAMEN_FULL_ACA001.xml`) |
| View Layer | JSP (JavaServer Pages) |
| Character Encoding | Shift JIS (SJIS), as indicated by the X33 filter package |

No external framework (such as Spring or Hibernate) was detected from the import analysis. The application relies on standard Java EE APIs.

## Architecture

The following diagram shows how the main modules of this codebase relate to each other:

```mermaid
flowchart TD
    Config["Deployment Config"]
    Encoding["Encoding Layer"]
    Lifecycle["Lifecycle Layer"]
    View["View Layer"]
    Framework["JSF Framework"]
    XML["web-full.xml"]
    FILTER["X33JVRequestEncodingSjisFilter"]
    LISTENER["X33AppContextListener"]
    BEAN["ACA001SFBean"]
    LOGIC["ACA001SFLogic"]
    SERVLET["FacesServlet"]
    XML -->|"registers"| FILTER
    XML -->|"registers"| LISTENER
    XML -->|"registers"| SERVLET
    XML -->|"wires"| LOGIC
    XML -->|"configures"| BEAN
    FILTER -->|"sets encoding"| SERVLET
    LISTENER -->|"initializes"| SERVLET
    LOGIC -->|"invokes"| BEAN
    BEAN -->|"renders via"| SERVLET
```

**How to read this diagram:**

- **Deployment Config** (`web-full.xml`) is the central wiring point. It registers filters, listeners, and servlets with the container and wires logic classes to backing beans.
- **Encoding Layer** contains the servlet filter that sits between incoming requests and the JSF servlet.
- **Lifecycle Layer** holds the application context listener responsible for bootstrap and teardown.
- **View Layer** follows the MVC pattern: logic classes process requests, backing beans carry data, and JSP pages render the result.
- **JSF Framework** (`FacesServlet`) is the front controller that orchestrates the request processing lifecycle.

## Module Guide

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

This package provides a servlet filter named `X33JVRequestEncodingSjisFilter`. Its name indicates an intent to set the HTTP request character encoding to Shift JIS (SJIS), which is the standard encoding for Japanese text on Windows systems. The filter is registered in `web-full.xml` and would intercept HTTP requests before they reach the target servlet.

**Key class:** `X33JVRequestEncodingSjisFilter` — currently a no-op stub. It implements `javax.servlet.Filter` but its `doFilter()` method simply delegates to the next filter in the chain without modifying the request. If encoding logic is needed, this is where it should go (e.g., `req.setCharacterEncoding("SJIS")`).

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

This package contains `X33AppContextListener`, a class designed to act as a servlet context initializer for the X33 application. Based on its naming, it appears to be a placeholder for application-scoped bootstrap logic — such as one-time initialization on startup or resource cleanup on shutdown.

**Key class:** `X33AppContextListener` — currently an empty class body with no fields, constructors, or methods. It does not yet implement `javax.servlet.ServletContextListener`. If this listener is meant to be active, it must be registered in `web.xml` via a `<listener>` element or annotated with `@WebListener`.

### eo.web.webview.ACA001SF

This is the most fully implemented module in the codebase. It implements a complete MVC view named `ACA001SF` (likely a screen or form identifier). The module follows a standard Java EE MVC pattern with a backing bean, a logic class, and a JSP view page, all wired through an XML configuration file (`WEBGAMEN_FULL_ACA001.xml`).

**Key classes:**

- **`ACA001SFBean`** — A minimal JavaBeans data carrier with a single `value` field (`String`) and a `getValue()` getter. Used by 3 JSP views.
- **`ACA001SFLogic`** — The view's action handler with an `execute()` method. Currently has an empty body but is documented with the javadoc "Futurity view logic." This is where business logic should be added to populate the bean and drive navigation.

**Request flow:** The XML config routes requests to `ACA001SFLogic.execute()`, which is expected to populate `ACA001SFBean.value`, after which the request is forwarded to `FULL_ACA001010PJP.jsp` for rendering.

### javax.faces.webapp

This is not an application-specific module but rather the JSF standard library package that provides the `FacesServlet`. The `FacesServlet` is the JSF front controller — the central entry point that processes every JSF-managed request through the six-phase JSF lifecycle (Restore View, Apply Request Values, Process Validation, Update Model Values, Invoke Application, Render Response).

The servlet is registered in the deployment descriptor and maps to URL patterns such as `*.jsf` or `*.faces`. As a standard servlet, it participates in the servlet filter chain, so pre-filters (like the encoding filter in the X33 package) can modify requests before JSF processing begins.

## Getting Started

If you're new to this codebase and want to understand how it works end to end, follow this reading order:

1. **`web-full.xml`** — Start here. This is the central deployment descriptor that registers all the components (filters, listeners, servlets) and tells the container what to do. It is the map of the entire application.

2. **`javax.faces.webapp` (FacesServlet)** — Next, understand how the JSF front controller works. Every web request that matches a JSF URL pattern flows through this servlet, so it's the heart of the application's request processing.

3. **`com.fujitsu.futurity.web.x33.filter` (X33JVRequestEncodingSjisFilter)** — See how incoming requests are pre-processed. This filter sits in front of the JSF servlet and is where character encoding is (or should be) set.

4. **`com.fujitsu.futurity.web.x33.listener` (X33AppContextListener)** — Learn about the application's bootstrap path. This listener would handle startup and shutdown events.

5. **`eo.web.webview.ACA001SF` (ACA001SFBean + ACA001SFLogic)** — Walk through the most complete example of a view in the application. Trace the flow from the XML configuration through the logic class, the bean, and finally to the JSP view. This pattern will be repeated across the application.

6. **`WEBGAMEN_FULL_ACA001.xml`** — Finally, study this application-specific wiring file to see how individual views are configured in the context of the larger system.

### Entry Points

| Entry Point | Path | What it does |
|---|---|---|
| FacesServlet | `javax/faces/webapp/FacesServlet.java` | Front controller for all JSF requests |
| X33JVRequestEncodingSjisFilter | `com/fujitsu/futurity/web/x33/filter/X33JVRequestEncodingSjisFilter.java` | Servlet filter for request encoding |
| X33AppContextListener | `com/fujitsu/futurity/web/x33/listener/X33AppContextListener.java` | Application bootstrap/shutdown |
| ACA001SFLogic | `eo/web/webview/ACA001SF/ACA001SFLogic.java` | Example view logic (entry point for ACA001SF) |
| ACA001SFBean | `eo/web/webview/ACA001SF/ACA001SFBean.java` | Data carrier for ACA001SF view |