# Root

## Overview

The root package area appears to act as a container for two separate web-integration concerns rather than a single cohesive domain model. The available child documentation shows one branch under `com.fujitsu.futurity` and another under `eo.web.webview`, and both are centered on framework wiring, request handling, and configuration-driven page flow.

Taken together, this root area seems to represent the application’s integration boundary with the web stack. One side handles servlet-filter request interception for the Futurity/X33 path, while the other side provides named page fixtures and bean/logic classes that XML and JSP artifacts can resolve by exact class name. Neither branch is described as containing much business logic; instead, both appear to exist so the surrounding container and framework can locate the right components at runtime.

## Sub-module Guide

### `com.fujitsu.futurity`

This branch appears to be the HTTP entry-point side of the system. The child documentation describes `com.fujitsu.futurity.web` as a web integration boundary, with `com.fujitsu.futurity.web.x33` scoping the X33-specific request path and `com.fujitsu.futurity.web.x33.filter` providing the concrete `X33JVRequestEncodingSjisFilter`.

The relationship is layered and container-driven:

- `com.fujitsu.futurity.web` defines the web integration area
- `com.fujitsu.futurity.web.x33` narrows that area to X33-related handling
- `com.fujitsu.futurity.web.x33.filter` contains the runtime filter implementation
- `X33JVRequestEncodingSjisFilter` joins the servlet filter chain
- `web.xml` and `web-full.xml` register the filter with the container

This means the branch is primarily about request interception and edge-of-system behavior. It appears to normalize, prepare, or otherwise gate incoming HTTP traffic before downstream processing occurs.

### `eo.web`

This branch appears to be the view/wiring side of the system. The child documentation describes `eo.web.webview` as a small integration area whose main role is to provide named classes that XML descriptors and JSP pages can reference.

Within that child, `ACA001SF` is the concrete fixture, and it contains two important pieces:

- `ACA001SFBean` - a minimal data carrier with a visible `value` property
- `ACA001SFLogic` - an execution hook with an empty `execute()` method

The relationship is configuration-first rather than object-oriented in the usual sense. XML config appears to name the logic class, the framework invokes `execute()`, and the view layer reads bean state. The child documentation also mentions an alternate `ACA001SFLogic` source variant under `xml-unresolved-fqn`, which appears to exist to exercise class-resolution edge cases.

This means `eo.web` is less about computing business outcomes and more about making framework-driven page flow resolvable and testable.

## Key Patterns and Architecture

The two branches follow different parts of the same overall integration story:

- `com.fujitsu.futurity` handles inbound request processing at the servlet boundary.
- `eo.web` handles page and view binding through configuration and named classes.

That division suggests a layered web architecture:

1. Requests enter through the servlet container.
2. `com.fujitsu.futurity.web.x33.filter` can intercept or prepare the request.
3. Framework routing or page flow then resolves named logic and bean classes under `eo.web.webview`.
4. XML descriptors and JSPs drive the actual view selection and data consumption.

The common pattern across both branches is externalized wiring. Behavior appears to be activated by container configuration and framework conventions rather than by direct Java-to-Java calls. This makes the codebase sensitive to package names, class names, and deployment descriptors.

A second shared pattern is intentional thinness:

- the filter side appears to be a narrow servlet hook rather than a full subsystem
- the page-flow side uses minimal logic and minimal data objects

That combination suggests the root area is intended to support integration and compatibility, not to host complex domain algorithms.

```mermaid
flowchart LR
ComFujitsu["com.fujitsu"] --> Futurity["com.fujitsu.futurity"]
Futurity --> WebPkg["com.fujitsu.futurity.web"]
WebPkg --> X33Pkg["com.fujitsu.futurity.web.x33"]
X33Pkg --> FilterPkg["com.fujitsu.futurity.web.x33.filter"]
FilterPkg --> FilterClass["X33JVRequestEncodingSjisFilter"]
FilterClass --> ServletChain["Servlet filter chain"]
WebXml["web.xml"] --> FilterClass
WebFullXml["web-full.xml"] --> FilterClass
EoWeb["eo.web"] --> Webview["eo.web.webview"]
Webview --> ACA001SF["ACA001SF"]
ACA001SF --> Bean["ACA001SFBean"]
ACA001SF --> LogicMain["ACA001SFLogic full-fixture-codebase"]
ACA001SF --> LogicAlt["ACA001SFLogic xml-unresolved-fqn"]
LogicMain --> XMLAndJSP["XML configs and JSP views"]
LogicAlt --> XMLAndJSP
Bean --> XMLAndJSP
```

## Dependencies and Integration

The evidence for the root module does not show direct source dependencies between the two branches, and no package dependencies were resolved at the root level. So the integration story here is best understood as architectural rather than code-level coupling.

### External dependencies and platform integration

For `com.fujitsu.futurity`, the relevant external contracts are:

- the Servlet API filter lifecycle
- the servlet container’s filter ordering and request dispatch behavior
- deployment descriptors such as `web.xml` and `web-full.xml`

For `eo.web`, the relevant external contracts are:

- XML configuration that names logic and bean classes
- JSP or other presentation artifacts that consume bean state
- framework conventions that locate and invoke `execute()` on the configured logic class

### How the branches connect to the wider system

These branches appear to sit at different ends of the same web application flow. One branch manages inbound request handling; the other manages named page/view components. The available documentation does not show a direct code path from the filter side into the page-flow side, but it is reasonable to infer that both are part of the same container-managed application lifecycle.

This means changes here may need coordination across configuration files as much as across Java source. A filter registration change can alter request entry behavior, while a class rename in `eo.web.webview` can break XML or JSP resolution even if the code still compiles.

## Notes for Developers

- Treat the root area as an integration boundary, not as a business-logic module.
- `com.fujitsu.futurity` appears to be the request-edge side of the application; check filter registration and deployment descriptors when debugging incoming request behavior.
- `eo.web` appears to be the configuration-bound page-flow side; check XML and JSP references when debugging class resolution or view wiring.
- Both branches rely heavily on exact package and class names. Renaming or moving classes may break runtime wiring even if compilation succeeds.
- The child documentation suggests that several classes are intentionally minimal. That usually means the surrounding framework or configuration carries much of the real behavior.
- The evidence base for the root is small, so some of this synthesis is necessarily tentative and should be revisited if more source-level documentation becomes available.