# Repository Overview

Welcome to this repository! This codebase is a Java-based web application test fixture collection built on the Java EE stack. It exercises JavaServer Faces (JSF), the servlet filter lifecycle, and JSP compilation pipelines — serving both as a regression test harness and as a realistic sample application structure. You'll find servlet filters handling character encoding for Japanese Shift JIS content, JSF backing beans wired into the faces-config lifecycle, and numerous JSP/XML fixture variants used to stress-test build tooling and import resolution. Whether you're here to trace request flows or hunt down a JSP import quirk, this guide will help you find your way.

## Overview

This repository contains a **Java EE / Jakarta EE web application codebase** organized as a comprehensive test fixture suite. It is structured around several interrelated concerns:

- **JSF view-layer logic** — Backing beans and view logic classes for ACA001-related JSP views, wired through `faces-config.xml` and various XML screen definitions.
- **Servlet filter infrastructure** — A character encoding filter (currently a no-op) for Japanese Shift JIS content in the X33 subsystem, plus a stub `FacesServlet` that represents the JSF front controller.
- **JSP and XML fixtures** — Multiple directories of JSP pages, deployment descriptors, and XML configuration files designed to test build tooling, import resolution, and config parsing across diverse edge cases.
- **Regression test cases** — Dedicated directories like `bug-ca-002-attr-order` for verifying JSP compilation and attribute ordering.

The codebase contains 63 graph nodes and 40 edges across 7 indexed files, organized into 5 top-level package areas and 1 documentation module.

## Technology Stack

| Technology | Role | Evidence |
|---|---|---|
| **Java (JDK)** | Language | `.java` source files under `full-fixture-codebase/src/java` and `xml-unresolved-fqn/src/java` |
| **JavaServer Faces (JSF)** | Web framework | `FacesServlet`, `faces-config.xml`, managed beans |
| **Java Servlet API** | Web tier | `javax.servlet.Filter`, `javax.servlet.ServletContextListener`, `web.xml`, `web-full.xml` |
| **JSP** | View technology | JSP files such as `BugCa002Language Before Import.jsp`, `FULL_ACA001010PJP.jsp` |
| **XML** | Configuration | `faces-config.xml`, `web.xml`, `web-full.xml`, screen definitions, deployment descriptors |

No well-known third-party frameworks (Spring, Hibernate, etc.) were detected from import analysis. This project uses plain Java EE APIs.

## Architecture

The system is organized into a layered Java EE web application, supplemented by a broad set of fixture directories used for regression testing. Below is a high-level view of how the main modules and packages relate:

```mermaid
flowchart TD
    subgraph TestFrameworks["Test Fixture Frameworks"]
        JSP["JSP Fixtures<br/>jsp-multi-import, jsp-usebean,<br/>jsp-shift-jis, etc."]
        XML["XML Fixtures<br/>xml-faces-config, xml-unresolved-fqn,<br/>xml-web-xml-multi-pattern, etc."]
        BUG["Bug Regression<br/>bug-ca-002-attr-order"]
    end
    subgraph JavaCode["Java Source Code"]
        FC["full-fixture-codebase<br/>Main Java sources"]
        UF["xml-unresolved-fqn<br/>Mirror/alternative sources"]
    end
    subgraph JavaPackages["Java Packages"]
        BC["com.example.bugca002<br/>KnownClass"]
        XF["com.fujitsu.futurity.web.x33.filter<br/>X33JVRequestEncodingSjisFilter"]
        XL["com.fujitsu.futurity.web.x33.listener<br/>X33AppContextListener"]
        ACA["eo.web.webview.ACA001SF<br/>ACA001SFBean, ACA001SFLogic"]
        FS["javax.faces.webapp<br/>FacesServlet"]
    end
    subgraph Config["Deployment Config"]
        WXML["web.xml / web-full.xml"]
        FCM["faces-config.xml"]
    end
    JSP --> FC
    XML --> FC
    BUG --> FC
    FC --> BC
    FC --> XF
    FC --> XL
    FC --> ACA
    FC --> FS
    XF --> WXML
    XL --> WXML
    FS --> WXML
    FS --> FCM
    ACA --> WXML
    ACA --> FCM
```

At a high level:

1. **Java source code** lives under `full-fixture-codebase/src/java` and `xml-unresolved-fqn/src/java`. These define the core package tree.
2. **Java packages** implement specific concerns: a servlet filter for encoding (X33), a servlet context listener (X33), a JSF backing bean and view logic (ACA001SF), a stub FacesServlet, and a minimal test fixture class (KnownClass).
3. **JSP and XML fixtures** exercise build tooling and import resolution. Each subdirectory under `bug-ca-*`, `jsp-*`, and `xml-*` tests a specific edge case or scenario.
4. **Deployment configuration** (`web.xml`, `web-full.xml`, `faces-config.xml`) wires everything together for the servlet container at deploy time.

## Module Guide

### com.example.bugca002 — Test Fixture Stub

This package contains a single class, `KnownClass`, which exists solely as a resolvable import target for JSP pages. It has no fields, an empty `execute()` method, and is intentionally minimal. The `bug-ca-002-attr-order` directory suggests this is tied to a regression test for JSP import resolution or attribute ordering. Think of this module as the repository's "Hello World" test stub — it exists so that other files can import it without triggering compilation errors.

**Key class:** [`KnownClass`](com/example/bugca002.md) — public class with an empty `execute()` no-op method. Used as a stable symbol that JSP views import to verify resolution works.

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

This package defines `X33JVRequestEncodingSjisFilter`, a servlet filter intended to set Japanese Shift JIS encoding on incoming HTTP requests for the X33 application module. However, the filter currently delegates all requests through the chain without modification — it is a scaffolding stub awaiting implementation. The `doFilter()` method should eventually call `req.setCharacterEncoding("MS932")` (or a locale-appropriate variant) before delegating. The filter is registered in both `web.xml` and `web-full.xml`.

**Key class:** [`X33JVRequestEncodingSjisFilter`](com/fujitsu/futurity/web/x33/filter.md) — implements `javax.servlet.Filter` with pass-through `doFilter()`, empty `init()`, and empty `destroy()`.

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

This package contains `X33AppContextListener`, a servlet `ServletContextListener` stub for the X33 web application. It is registered in `web.xml` and is intended to implement `contextInitialized()` and `contextDestroyed()` for setting up or tearing down application-scoped resources. The class body is currently empty — no interface is declared and no methods are implemented. To make this functional, one would need to add `implements ServletContextListener` and fill in both lifecycle methods.

**Key class:** [`X33AppContextListener`](com/fujitsu/futurity/web/x33/listener.md) — empty class intended as a `ServletContextListener` for X33 startup/shutdown hooks.

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

This is the most fleshed-out module in the repository. It implements the view-layer backing logic for an ACA001-related JSF flow. It contains two classes:

- **`ACA001SFBean`** — A standard JSF managed bean with a single `String value` property (getter only, no setter). It is registered in `faces-config.xml` and referenced by multiple XML screen definitions and JSP views.
- **`ACA001SFLogic`** — A view logic controller class with a single `execute()` method (currently empty). It appears in two source trees (`full-fixture-codebase` and `xml-unresolved-fqn`), suggesting one is canonical and the other is a mirror artifact.

The flow works as follows: a request hits a JSP view (e.g., `FULL_ACA001010PJP.jsp`), JSF resolves `ACA001SFBean` from configuration, `ACA001SFLogic.execute()` is called as the view's logic entry point, and the JSP renders by reading properties from the bean.

**Key classes:** [`ACA001SFBean`](eo/web/webview/ACA001SF.md), [`ACA001SFLogic`](eo/web/webview/ACA001SF.md) — JSF managed bean with immutable string property and empty view logic controller.

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

This package contains a stub `FacesServlet` class in the `javax.faces.webapp` package. In a real JSF implementation (Mojarra, MyFaces, etc.), this class would intercept all matching requests and drive the six-phase JSF lifecycle: restore view, apply request values, process validations, update model values, invoke application, and render response. Here, the class is declared but empty — it has no `service()` override, no lifecycle initialization, and no methods at all. It is wired into `web.xml` and `web-full.xml` as part of the deployment configuration.

**Key class:** [`FacesServlet`](javax/faces/webapp.md) — empty stub class in the standard JSF front controller package.

## Getting Started

If you are a new developer exploring this codebase for the first time, we recommend the following reading order:

1. **Start here** (`overview.md`) — This page gives you the big-picture map of what the repository contains.
2. **Read the ACA001SF module** (`eo/web/webview/ACA001SF.md`) — It is the most complete module and shows a realistic JSF request flow from JSP view through managed bean to view logic. Understanding this flow gives you the context for the rest of the codebase.
3. **Read the filter module** (`com/fujitsu/futurity/web/x33/filter.md`) — Understand how servlet filters fit into the request pipeline and where character encoding logic would hook in.
4. **Read the listener module** (`com/fujitsu/futurity/web/x33/listener.md`) — See how the servlet container lifecycle works and what initialization hooks look like.
5. **Explore the FacesServlet** (`javax/faces/webapp.md`) — Learn where JSF enters the servlet container and how the deployment descriptors wire everything together.
6. **Browse the fixture directories** — Look at the `jsp-*`, `xml-*`, and `bug-ca-*` directories to see the diverse edge cases this repository was designed to exercise.

### Entry points

- **Request entry**: `FacesServlet` (if deployed) receives all JSF-mapped requests and drives the lifecycle.
- **Filter chain**: `X33JVRequestEncodingSjisFilter` sits in the filter chain for X33-mapped URLs.
- **Application startup**: `X33AppContextListener` (once implemented) would initialize X33-scoped resources.
- **View rendering**: `ACA001SFBean` and `ACA001SFLogic` power the ACA001 view layer.

### Recommended reading order for understanding a request flow

```
1. web.xml / web-full.xml          (deployment wiring)
2. javax.faces.webapp.FacesServlet (request entry)
3. com.fujitsu.futurity...filter   (filter chain processing)
4. eo.web.webview.ACA001SF         (view logic + backing bean)
5. JSP views                       (final HTML rendering)
```

This layered understanding — from deployment descriptors through filters to JSF beans and JSP views — will give you the mental model needed to navigate and extend this codebase with confidence.