# Repository Overview

Welcome to the codebase! This repository is a collection of Java EE / Jakarta EE sample projects built around JavaServer Faces (JSF) for the web layer. It includes a "full-fixture" web application with a servlet filter, context listener, and JSF-backed views, along with several smaller test fixtures aimed at validating static analysis rules — in particular, JSP import attribute ordering (the **bug-ca-002** rule) and various XML configuration edge cases. You'll find both production-style code and minimal stubs intended for use as test data by linting and code-quality tooling.

## Overview

The codebase centers on a JSF-based web application (referred to internally as "Futurity") that demonstrates a standard Java EE web architecture: a front-controller servlet (`FacesServlet`), servlet filters for request processing, context listeners for application lifecycle management, and JSF managed beans that connect the view layer to view logic. In addition to the main application code, the repository contains a set of small, self-contained test fixtures targeting specific static-analysis rules — for example, JSP import ordering, XML unresolved fully-qualified names, and Shift JIS character encoding scenarios.

These fixtures live in top-level directories such as `bug-ca-002-attr-order`, `jsp-shift-jis`, `xml-unresolved-fqn`, and others. Each one contains a minimal, focused code sample designed to trigger or exercise a particular rule or analyzer.

## Technology Stack

| Technology | Role |
|---|---|
| **Java EE / Jakarta EE** (Servlet API, JSF) | Web framework for the application server |
| **JSF (JavaServer Faces)** | Component-based UI framework with request lifecycle |
| **JSP (JavaServer Pages)** | View templating engine |
| **Servlet Filter** | `X33JVRequestEncodingSjisFilter` (currently a no-op stub) |
| **ServletContextListener** | `X33AppContextListener` (currently a no-op stub) |
| **web.xml / web-full.xml** | Standard deployment descriptors for servlet configuration |
| **faces-config.xml** | JSF application configuration (managed beans, navigation) |
| **Sonar / static-analysis fixtures** | Test data for rules like bug-ca-002 (import ordering) |

No well-known third-party frameworks beyond the Java EE / Jakarta EE platform were detected from import analysis.

## Architecture

The main web application follows a classic JSF MVC pattern. Incoming HTTP requests are first intercepted by the servlet filter chain, then dispatched to the `FacesServlet`, which manages the JSF lifecycle and delegates to managed beans and their associated logic classes.

```mermaid
flowchart TD
    WebConfig["web.xml / web-full.xml"] --> Filter["X33JVRequestEncodingSjisFilter"]
    WebConfig --> FacesServlet["FacesServlet"]
    Filter --> FacesServlet
    FacesServlet --> ACA001SF["ACA001SF
(Bean + Logic)"]
    FacesServlet --> BugCa002["KnownClass
(test fixture)"]
```

At a high level:

- **Deployment configuration** (`web.xml`, `web-full.xml`) wires together the filter, the servlet, and the context listener.
- **The filter** (`X33JVRequestEncodingSjisFilter`) sits in the request pipeline. Its current implementation is a no-op stub — all requests pass through unchanged.
- **The FacesServlet** is the JSF front controller. It receives requests, executes the six-phase JSF lifecycle, and renders responses.
- **ACA001SF** is a JSF-backed view module consisting of a managed bean (`ACA001SFBean`) and a logic class (`ACA001SFLogic`).
- **KnownClass** lives in the `bug-ca-002-attr-order` fixture as a simple stub used by static-analysis test data (not part of the main application flow).

## Module Guide

### com.example.bugca002 (test fixture)

This package contains the `KnownClass` class, which is intentionally minimal — an empty public class with an empty `execute()` method. Its sole purpose is to serve as a well-known, importable type that static-analysis tools can resolve against during import-ordering checks. The `bug-ca-002` Sonar rule (import attribute ordering) relies on this class to validate that JSP `<%@ page import %>` and `<jsp:useBean>` declarations appear in the correct order. This is test data, not production code — do not remove it.

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

This package provides the `X33JVRequestEncodingSjisFilter`, a `javax.servlet.Filter` implementation registered in `web.xml` and `web-full.xml`. The filter's name suggests it was intended to enforce Shift JIS encoding on incoming requests from a Japanese client tier, but the current implementation is a no-op: all three `Filter` lifecycle methods delegate immediately without modifying the request. It is a placeholder that may need implementation if SJIS encoding is still required.

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

This package provides the `X33AppContextListener`, a `ServletContextListener` registered in `web.xml`. The class is currently a stub with no methods or fields implemented. When completed, it would typically handle application-wide initialization in `contextInitialized()` (e.g., loading configuration, starting background threads) and cleanup in `contextDestroyed()`.

### eo.web.webview.ACA001SF (JSF view module)

This is the most substantial application module in the codebase. It follows the standard JSF MVC pattern with two classes:

- **`ACA001SFBean`** — A JSF managed bean with a single `String value` field and a getter. It acts as the data carrier between the view logic and the JSP view layer.
- **`ACA001SFLogic`** — The view logic handler with an `execute()` method (currently empty). This class is the counterpart to the bean and would conventionally prepare data, invoke business services, and populate the bean before the view renders.

The module is wired into the JSF lifecycle through `faces-config.xml` and referenced by multiple XML configuration files (`WEBGAMEN_FULL_ACA001.xml`, `WEBGAMEN_ACA001010PJP.xml`, `x33S_ACA001.xml`) and JSP views. The data model is minimal — a single string field.

### javax.faces.webapp (JSF framework)

This package exposes the `FacesServlet`, the central front controller for any JSF application. It intercepts HTTP requests mapped to JSF URL patterns (e.g., `*.jsf`, `*.faces`, `/faces/*`), coordinates the six-phase JSF lifecycle (Restore View, Apply Request Values, Process Validations, Update Model Values, Invoke Application, Render Response), and manages `FacesContext` scoping. In this codebase the source file is a minimal stub; a production implementation would contain the full lifecycle delegation logic.

## Getting Started

If you are new to this codebase, we recommend reading the modules in the following order to build a mental model of how the pieces fit together:

1. **Start with `javax.faces.webapp`** — Understand the `FacesServlet` as the central request dispatcher. This gives you the foundational model of how HTTP requests flow through the application.
2. **Read `com.fujitsu.futurity.web.x33.filter`** and **`com.fujitsu.futurity.web.x33.listener`** — See where the filter and context listener sit in the request pipeline and application lifecycle.
3. **Explore `eo.web.webview.ACA001SF`** — This is the main application module with working JSF bean and logic classes. Follow the request flow from the JSP view through the bean and logic class back to the rendered page.
4. **Check `com.example.bugca002`** — Finally, look at the test fixture to understand how this codebase uses minimal stubs for static-analysis validation.

Key entry points to keep in mind:
- **`web.xml` / `web-full.xml`** — The single source of truth for how components are wired together at deploy time.
- **`faces-config.xml`** — The JSF-specific configuration that declares managed beans and navigation rules.
- **`X33JVRequestEncodingSjisFilter`** — The filter entry point for incoming requests (currently a no-op).
- **`ACA001SFBean`** / **`ACA001SFLogic`** — The primary JSF view module to trace for understanding the MVC flow.