# Repository Overview

Welcome! This repository is a Java web application codebase built on the Java EE platform with JavaServer Faces (JSF) for the web tier. If you're picking up work here, you'll find a modular project organized around servlet-based web components — filters, listeners, and JSF managed beans — configured through standard `web.xml` and `faces-config.xml` descriptors. Many of the modules are scaffolding or stub implementations, suggesting this repository serves as a code template, fixture set, or early-stage application under active development. Let's walk through the layout so you can hit the ground running.

## Overview

This project is a Java EE web application that uses JSF as its primary web framework. The codebase is organized into several top-level packages, each responsible for a distinct layer of the web application stack:

- **Servlet filters** that intercept incoming HTTP requests
- **Context listeners** that handle application lifecycle events
- **JSF view modules** containing managed beans and action logic
- **JSF runtime integration** via the standard `FacesServlet` front controller
- **Utility and resolution classes** used by other modules for import resolution

The application follows the standard Java EE web application conventions: deployment descriptors in `web.xml`, JSF configuration in `faces-config.xml`, and JSP-based view pages. Many components appear to be minimal stubs awaiting further implementation.

## Technology Stack

This codebase is built on a traditional Java EE stack:

| Layer | Technology | Purpose |
|-------|-----------|---------|
| **Web Framework** | JavaServer Faces (JSF) | UI component framework for building web interfaces |
| **Servlet API** | `javax.servlet.*` | Core servlet filter and listener infrastructure |
| **View Layer** | JSP (JavaServer Pages) | Server-side view rendering |
| **Configuration** | `web.xml`, `faces-config.xml` | Standard Java EE deployment descriptors |
| **Character Encoding** | Shift JIS (SJIS) | Japanese language character encoding support |
| **Server Profile** | Java EE Full Profile | Targeted at `web-full.xml` deployment |

No external framework dependencies (e.g., Spring, Hibernate) were detected from import analysis. The application relies on the standard Java EE API, which would be provided by the target servlet container at runtime.

## Architecture

The application follows a layered web architecture typical of Java EE applications. Here is a high-level view of the module relationships:

```mermaid
flowchart TD
    SUB["Web Tier"]
    SUB2["JSF Runtime"]
    SUB --> FILTER["X33JVRequestEncodingSjisFilter<br/>(Servlet Filter)"]
    SUB --> LISTENER["X33AppContextListener<br/>(ServletContextListener)"]
    SUB --> VIEW["ACA001SF<br/>(JSF View Module)"]
    SUB2 --> FACES["FacesServlet<br/>(JSF Front Controller)"]
    FILTER --> FACES
    LISTENER --> FACES
    VIEW --> FACES
    IMPORT["com.example.bugca002<br/>(Import Resolution)"] --> VIEW
```

**How the pieces fit together:**

1. **Deployment** — The servlet container reads `web.xml` and `web-full.xml` during startup, registering the filter, listener, and `FacesServlet`.
2. **Startup** — `X33AppContextListener` fires `contextInitialized()` when the application deploys (currently a no-op).
3. **Request handling** — Incoming requests flow through the filter chain, then reach `FacesServlet`, which bootstraps the JSF lifecycle.
4. **View rendering** — JSF manages the component tree for view pages (e.g., `FULL_ACA001010PJP.jsp`) and delegates to managed beans like `ACA001SFBean` for data binding.
5. **Action processing** — User-triggered actions invoke logic classes like `ACA001SFLogic.execute()` (currently a no-op).
6. **Response** — JSF renders the response and sends it back through the filter chain to the client.

## Module Guide

### com.example.bugca002 — Import Resolution Utility

This package exists solely to provide a class (`KnownClass`) that other modules can import. It has no runtime logic — no fields, no meaningful behavior, no external dependencies. The class and its empty `execute()` method are a scaffold, likely created to satisfy a compile-time import requirement from a JSP view. The naming convention (`bug-ca-002`) suggests it was introduced to resolve a specific code-quality issue, possibly related to attribute or import ordering. Treat this as scaffolding rather than functional code.

### com.fujitsu.futurity.web.x33.filter — Request Encoding Filter

The `X33JVRequestEncodingSjisFilter` is a Servlet Filter registered in `web.xml`. Its name indicates it was intended to enforce Shift JIS (SJIS) character encoding on incoming HTTP requests — a common requirement for Japanese-language enterprise applications. However, the current implementation is a no-op: it delegates every request to the next filter without modifying the encoding. This is likely either a stub waiting for implementation or a retired filter. If SJIS encoding support is still needed, the `doFilter()` method will need to be populated with logic such as `req.setCharacterEncoding("SJIS")`.

### com.fujitsu.futurity.web.x33.listener — Application Lifecycle Listener

`X33AppContextListener` is a `ServletContextListener` declared in `web.xml` to receive startup and shutdown notifications for the web application. The class is currently empty — no methods, no interfaces implemented, no fields. Its purpose is to serve as a wiring target: when `ServletContextListener` methods (`contextInitialized`, `contextDestroyed`) are added, this will become the entry point for application-wide initialization tasks such as bootstrapping configuration, initializing thread pools, or cleaning up resources.

### eo.web.webview.ACA001SF — JSF View Module

This is the most complete module in the codebase, following the standard JSF Model-View-Controller pattern. It provides:

- **ACA001SFBean** — A JSF managed bean exposing a single read-only `value` property (`String`). It is referenced by 4 XML configuration files and 2 JSP views, indicating it plays a central role in the view's data binding.
- **ACA001SFLogic** — The action-behavior class with a single `execute()` method that serves as the entry point for view actions (e.g., form submissions). Currently empty.

Two copies of `ACA001SFLogic` exist in the codebase (one in `full-fixture-codebase`, one in `xml-unresolved-fqn`), both functionally identical. This module is wired into the application through multiple XML configuration files (`faces-config.xml`, `WEBGAMEN_FULL_ACA001.xml`, `WEBGAMEN_ACA001010PJP.xml`, `x33S_ACA001.xml`) and consumed by JSP view pages.

### javax.faces.webapp — JSF Front Controller

This is the JSF runtime package that provides the `FacesServlet`, which acts as the front controller for all JSF requests. It implements the standard JSF lifecycle: Restore View → Apply Request Values → Process Validations → Update Model Values → Invoke Application → Render Response. The `FacesServlet` is registered in both `web.xml` and `web-full.xml` and is typically mapped to a URL pattern like `/faces/*` or `*.jsf`. In this codebase, the class definition is a minimal stub — the actual JSF lifecycle implementation would be provided by the JSF runtime library (e.g., Mojarra, MyFaces) at deployment time.

## Getting Started

If you're new to this codebase, here's a recommended reading order to build your mental model:

1. **Start with `javax.faces.webapp.FacesServlet`** — This is the single entry point for all JSF requests. Understanding the JSF lifecycle here gives you the backbone for how the entire application processes user interactions.
2. **Read `eo.web.webview.ACA001SF`** — This is the most substantive module and follows the familiar MVC pattern. Start with the managed bean (`ACA001SFBean`), then the logic class (`ACA001SFLogic`), and finally trace through the JSP view to see how data flows.
3. **Explore the X33 modules** (`com.fujitsu.futurity.web.x33`) — The filter and listener packages show the servlet-level infrastructure. Even though they're currently no-ops, they demonstrate how the application hooks into the request lifecycle.
4. **Check `com.example.bugca002`** — This is a short read (one class, one method) and will clarify the import-resolution pattern used elsewhere in the codebase.
5. **Review `web.xml` and `faces-config.xml`** — These deployment descriptors tie everything together. They declare the servlet mappings, filter chains, listener registrations, and managed-bean configurations.

### Key entry points to search for

- **Entry point**: `javax.faces.webapp.FacesServlet` — handles all JSF requests
- **Filter chain**: `X33JVRequestEncodingSjisFilter` — intercepts requests before they reach JSF
- **Startup**: `X33AppContextListener` — application lifecycle events
- **View data**: `ACA001SFBean` — JSF managed bean backing the ACA001SF view
- **Actions**: `ACA001SFLogic` — action handler for the ACA001SF view

### Where to look for configuration

| File | Purpose |
|------|---------|
| `web.xml` | Servlet, filter, and listener declarations |
| `web-full.xml` | Full web profile descriptor (Java EE full profile) |
| `faces-config.xml` | JSF managed beans, navigation rules, converters |
| `WEBGAMEN_FULL_ACA001.xml` | Module-specific JSF configuration |
| `WEBGAMEN_ACA001010PJP.xml` | View-specific JSF configuration |
| `x33S_ACA001.xml` | Additional ACA001 module configuration |

---

This codebase is a Java EE web application in a state of early development or scaffolding. Many components are stubs with no operational logic, which means there's plenty of room to add functionality. The structure follows well-established Java EE conventions, so if you're familiar with Servlets and JSF, you'll find the patterns recognizable. Happy coding!