# Repository Overview

Welcome! If you're reading this, you're probably about to dive into a Java EE / JSF (JavaServer Faces) web application codebase built around the Fujitsu Futurity product line. This repository contains a mix of production-style JSF pages and UI components alongside test fixtures used to validate JSP parsing and XML configuration behavior. The application is organized around a classic front-controller pattern (JSF `FacesServlet`), with servlet filters handling character encoding for Japanese-language requests, and context listeners managing application lifecycle setup. Whether you're here to fix a bug, add a feature, or just understand the codebase, this page will get you oriented quickly.

---

## Overview

This project is a Java EE web application that uses JavaServer Faces (JSF) as its primary UI framework. It appears to support Japanese-language interfaces, as evidenced by character encoding filters and naming conventions. The codebase includes:

- **A JSF web application** (`eo.web.webview.ACA001SF`) that renders a page labeled "Futurity" using the standard JSF model-view-controller pattern.
- **Servlet infrastructure** including a character-encoding filter for Shift JIS encoding and a servlet context listener for X33 application lifecycle management.
- **A JSF front controller** (`FacesServlet`) that orchestrates the standard JSF request lifecycle.
- **A test fixture** (`com.example.bugca002`) that exercises a JSP parser edge case around page directive attribute ordering (bug designation: BUG-CA-002).

The repository contains 63 code nodes across 7 files, structured across multiple independent source trees (e.g., `full-fixture-codebase`, `bug-ca-002-attr-order`, `xml-unresolved-fqn`, `xml-web-xml-multi-pattern`), suggesting it serves as a regression test harness or multi-variant codebase used for static analysis, parsing validation, and tooling verification.

---

## Technology Stack

| Technology | Role |
|---|---|
| **Java** | Primary programming language for all application code |
| **JavaServer Faces (JSF)** | Component-based UI framework driving the web layer |
| **Java Servlet API** (`javax.servlet.*`) | Web container interfaces for filters, listeners, and servlets |
| **JSP** (JavaServer Pages) | View technology used by the JSF layer |
| **XML Configuration** | `web.xml`, `web-full.xml`, `faces-config.xml`, and module-specific XML files for wiring beans, servlets, and navigation |
| **Shift JIS / cp932** | Japanese character encoding supported via custom filter |

No well-known third-party frameworks (Spring, Guice, etc.) were detected in the indexed code. The application appears to rely primarily on Java EE / Jakarta EE standard APIs.

---

## Architecture

The application follows a layered JSF architecture where the `FacesServlet` acts as the front controller, servlet filters process incoming requests, and JSF managed beans paired with logic classes handle business operations. The X33 infrastructure (filter and listener) sits at the servlet container level, while the ACA001SF webview module sits at the application level.

```mermaid
flowchart TD
    subgraph DEPLOY["Deployment Descriptors"]
        XML["web.xml"]
        XMLFULL["web-full.xml"]
    end
    subgraph CONTAINER["Servlet Container"]
        CLIENT["HTTP Client"]
        FILTER["X33JVRequestEncodingSjisFilter"]
        LISTENER["X33AppContextListener"]
        SERVLET["FacesServlet"]
        PHASE["JSF Lifecycle Phases"]
    end
    subgraph APP["Application Layer"]
        BEAN["ACA001SFBean"]
        LOGIC["ACA001SFLogic"]
        VIEW["FULL_ACA001010PJP.jsp"]
    end
    CLIENT --> FILTER
    FILTER --> SERVLET
    XML --> LISTENER
    XML --> SERVLET
    XMLFULL --> SERVLET
    XMLFULL --> FILTER
    SERVLET --> PHASE
    PHASE --> BEAN
    PHASE --> LOGIC
    BEAN --> VIEW
    LOGIC --> VIEW
    LISTENER -->|initializes| CONTAINER
```

At a high level:

1. **HTTP requests** arrive at the servlet container and pass through the `X33JVRequestEncodingSjisFilter` encoding filter before reaching `FacesServlet`.
2. **`FacesServlet`** orchestrates the JSF lifecycle (restore view, apply request values, process validations, update model, invoke application, render response).
3. **JSF managed beans** (`ACA001SFBean`) hold page data, and **logic classes** (`ACA001SFLogic`) handle form submission actions.
4. **JSP views** render the page using data from beans, wired together through XML configuration files.
5. **`X33AppContextListener`** provides a placeholder for application startup/shutdown logic.
6. **Test fixtures** (`com.example.bugca002`) operate independently as validation targets for parser behavior.

---

## Module Guide

### `com.example.bugca002` — JSP Parser Test Fixture

This package is a regression test fixture, not production code. It contains a single class (`KnownClass`) and a JSP page designed to exercise a JSP parser bug (BUG-CA-002): when the `language=` attribute appears before the `import=` attribute in a JSP `<%@ page %>` directive, the parser fails to recognize the import statement. The `KnownClass` serves as the resolution target for the import, and the JSP file (`BugCa002Language Before Import.jsp`) deliberately arranges directive attributes in the problematic order. This module exists to verify that the parser handles page directive attributes in any order, as required by the JSP specification.

### `com.fujitsu.futurity.web.x33.filter` — Shift JIS Encoding Filter

This package contains the `X33JVRequestEncodingSjisFilter`, a servlet filter intended to set the character encoding for HTTP requests from Japanese-language users to Shift JIS (`cp932`). Despite its descriptive name, the current implementation is a no-op: the `doFilter` method simply delegates to the next filter in the chain without modifying the request encoding. The filter is registered in both `web.xml` and `web-full.xml`, indicating it was designed for deployment in both Servlet and full Java EE application server environments. If Japanese character encoding issues arise, this is the likely place to investigate.

### `com.fujitsu.futurity.web.x33.listener` — Application Context Listener

This package contains the `X33AppContextListener`, a servlet context listener registered in `web.xml`. The class is currently an empty stub — it declares no interfaces, defines no methods, and performs no work. Its presence in the codebase appears to be scaffolding for future application lifecycle logic. In a typical JSF web application, this is where one would wire up Spring context initialization, database connection pooling setup, or application-scoped resource management. The listener sits as a sibling package to the encoding filter under the `com.fujitsu.futurity.web.x33` namespace.

### `eo.web.webview.ACA001SF` — Futurity Page Webview

This is the most feature-rich module in the repository. It implements a JSF-backed web page for the "Futurity" function (screen code `ACA001SF`) following a standard MVC pattern. The `ACA001SFBean` class holds a single `String` property called `value`, which serves as the data bridge between the JSP view and the business logic. The `ACA001SFLogic` class provides the `execute()` action handler, invoked when the page is submitted. Both classes are wired through multiple XML configuration files (`faces-config.xml`, `WEBGAMEN_FULL_ACA001.xml`, `WEBGAMEN_ACA001010PJP.xml`, `x33S_ACA001.xml`, `external-refs.xml`) and consumed by the `FULL_ACA001010PJP.jsp` view. Note that `ACA001SFLogic` exists in two source trees (`full-fixture-codebase` and `xml-unresolved-fqn`), diverging only on the presence of a Javadoc comment.

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

This module documents the `FacesServlet`, the central servlet for any JSF application. It acts as the front controller that receives all JSF-bound HTTP requests and dispatches each one through the six-phase JSF lifecycle (restore view, apply request values, process validations, update model values, invoke application, render response). In this codebase, the class is a declaration-only stub — the actual lifecycle implementation is provided by the JSF reference implementation (e.g., Mojarra) at runtime. The servlet is registered in `web.xml` and `web-full.xml` and serves as the core integration point between the HTTP layer and the JSF application layer.

---

## Getting Started

If you're new to this codebase, here's a recommended reading order to build a mental model of how everything fits together:

1. **`javax.faces.webapp` (FacesServlet)** — Start here to understand the front controller that drives the entire application. The FacesServlet is the entry point for every JSF request, so understanding its role in the lifecycle will help you understand where requests go next.

2. **`eo.web.webview.ACA001SF`** — This is the primary functional module. Read the `ACA001SFBean` and `ACA001SFLogic` classes, then follow the XML configuration files to see how they are wired together. Finally, look at `FULL_ACA001010PJP.jsp` to see the view layer. This will give you a concrete picture of the application's primary feature.

3. **`com.fujitsu.futurity.web.x33.filter` and `com.fujitsu.futurity.web.x33.listener`** — Read these together as a pair. They represent the X33 web application's servlet infrastructure layer. Understanding these will help you see how HTTP requests are encoded and how application context is initialized before requests reach the JSF layer.

4. **`com.example.bugca002`** — This is a test fixture, so treat it as supplementary. Read it if you're investigating JSP parser behavior or working on bug BUG-CA-002. The key file is the JSP page `BugCa002Language Before Import.jsp`, which deliberately triggers the parser edge case.

**Key entry points to look for:**
- `web.xml` and `web-full.xml` — deployment descriptors that wire everything together
- `faces-config.xml` — JSF bean registration and navigation configuration
- `WEBGAMEN_FULL_ACA001.xml` and related XML configs — module-specific wiring for the ACA001SF page
- `FULL_ACA001010PJP.jsp` — the primary JSF view page for the Futurity screen

The repository's modular structure (with separate source trees for different variants) suggests that you may be using static analysis or code understanding tools against this codebase. In that case, focusing on the `full-fixture-codebase` directory first will give you the most complete picture, as it contains the most fully realized variant of the application code.