# Repository Overview

Welcome! If you're reading this, you're about to explore a Java-based enterprise application that combines a web-facing JavaServer Faces (JSF) frontend with a batch-processing backend for financial operations. This codebase contains components from a few different vendors and domains: a Fujitsu Futurity X33 web tier handling servlet filtering and context management, and an OPTAGE/KOPT system managing batch jobs, contract processing, and Start-of-Day (SOD) workflows. Some packages are fully functional scaffolding, while others are still stubs waiting for implementation. Let's get you oriented.

## Overview

This repository houses a mixed-purpose Java application. The **web tier** (under `com.fujitsu.futurity.web.x33`) provides Jakarta Servlet infrastructure — a request-encoding filter and a servlet context listener — both of which are registered in the application's `web.xml`. The KOPT domain is the heart of the codebase: it organizes business logic into several packages handling batch processing, SOD dispatch, DTO data transfer, contract management, and service control.

Several modules are currently **auto-generated test fixtures** for a `SPEC-SCOPED-WIKI` test harness. Their method bodies are no-op placeholders, meaning the production logic is still to be implemented. A legacy test fixture (`com.example.bugca002`) exists solely to satisfy import resolution for a JSP page.

## Technology Stack

| Technology | Role |
|---|---|
| Java (SE) | Core language — the entire codebase is Java |
| Jakarta Servlet API (`javax.servlet.*`) | Web-tier filter and listener infrastructure |
| JavaServer Faces (`FacesServlet`) | JSF front-end framework |
| JUnit (`org.junit.Test`) | Unit testing framework |
| Standard Java libraries | `java.io`, `java.util`, `java.util.logging`, `java.sql` for I/O, collections, logging, and database access |

No well-known third-party frameworks (Spring, Hibernate, Guice, etc.) were detected from import analysis. The application relies primarily on standard Java EE / Jakarta EE APIs.

## Architecture

The system follows a layered architecture with a web tier, a batch-processing tier, and several business subpackages that delegate to one another:

```mermaid
flowchart TD
    subgraph Kopt["com.optage.kopt"]
        subgraph Batch["com.optage.kopt.batch"]
            BatchPkg["KKPRC14901, KKPRC24901, KKPRC34901"]
        end
        subgraph Bp["com.optage.kopt.bp"]
            BpPkg["JKKHakkoSODCC, JKKSodSendCC"]
        end
        subgraph Ekk["com.optage.kopt.ekk"]
            EkkPkg["EKK0301A010, EKK0301A020"]
        end
        subgraph Kkw["com.optage.kopt.kkw"]
            KkwPkg["KKW0100B001"]
        end
        subgraph Esc["com.optage.kopt.esc"]
            EscPkg["ESC0101B001"]
        end
        subgraph Dto["com.optage.kopt.dto"]
            DtoPkg["JKKSodRequestDTO, JKKSodResponseDTO"]
        end
    end
    subgraph Web["Web Tier"]
        subgraph Filter["com.fujitsu.futurity.web.x33.filter"]
            FilterPkg["X33JVRequestEncodingSjisFilter"]
        end
        subgraph Listener["com.fujitsu.futurity.web.x33.listener"]
            ListenerPkg["X33AppContextListener"]
        end
    end
    subgraph Legacy["Legacy / Test Fixtures"]
        subgraph BugCa002["com.example.bugca002"]
            BugPkg["KnownClass"]
        end
    end
    BpPkg --> EkkPkg
    EkkPkg --> KkwPkg
    BpPkg --> BatchPkg
```

**Layer description:**

- **Web Tier** — Servlet filters and context listeners that sit at the boundary between HTTP requests and the application.
- **Batch Tier** (`com.optage.kopt.batch`) — Entry points that trigger batch operations; they delegate to the EKK contract-processing package.
- **Business Processing** (`com.optage.kopt.bp`) — Orchestrates SOD (Start of Day) workflows. It calls into both the Batch tier for validation and the EKK tier for contract processing.
- **Contract Processing** (`com.optage.kopt.ekk`) — Handles primary and secondary contract processing. The primary class triggers downstream notifications to the KKW package.
- **DTO Layer** (`com.optage.kopt.dto`) — Simple request/response data carriers with no behavior.
- **Service Control** (`com.optage.kopt.esc`) — Placeholder service control class, currently unimplemented.
- **Batch Trigger** (`com.optage.kopt.kkw`) — Receives notifications from the EKK package; currently a stub.
- **Test Fixtures** — `com.example.bugca002` and `com.optage.kopt.unrelated` are scaffolding code for test harnesses.

## Module Guide

### `com.example.bugca002` — Import Resolution Target

This package contains a single class, `KnownClass`, with an empty `execute()` method. It exists solely so that a JSP page can import and reference the type without compile errors. It is a structural anchor rather than domain logic.

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

Contains `X33JVRequestEncodingSjisFilter`, a Servlet `Filter` registered in both `web.xml` and `web-full.xml`. Despite its name suggesting it sets Shift-JIS character encoding on incoming requests, the current implementation does nothing — it simply delegates to the next filter or servlet in the chain unchanged.

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

Contains `X33AppContextListener`, a `ServletContextListener` registered in `web.xml`. It is designed to receive startup and shutdown lifecycle callbacks. Currently it is an empty stub with no method implementations, ready for future application-wide initialization logic.

### `com.optage.kopt.batch` — Batch Processing Entry Points

Contains three batch runners (`KKPRC14901`, `KKPRC24901`, `KKPRC34901`). `KKPRC14901` is the most developed, with a `check()` pre-flight method and a `run()` method that delegates to `EKK0301A010().process()`. The other two runners are no-op placeholders. All three follow a facade pattern — they initiate batch work but delegate to the EKK package for actual processing.

### `com.optage.kopt.bp` — SOD Business Processing

The central orchestration package for Start of Day operations. Key classes:

- **`JKKHakkoSODCC`** — The coordination core. It dispatches SOD data via `dispatch()` (which calls `JKKSodSendCC.send()`) and validates via `validate()` (which calls `KKPRC14901.check()`).
- **`JKKSodSendCC`** — Handles the actual SOD send/dispatch logic.
- **`JKKBpServiceBase`** — Base service with shared initialization (`baseInit()`).
- **`JKKHakkoSODHelper`** — Stateless formatting utility that trims strings.

This package depends on both the `batch` and `ekk` packages, acting as a bridge between batch validation and contract processing.

### `com.optage.kopt.dto` — Data Transfer Objects

Contains two plain data carrier classes:

- **`JKKSodRequestDTO`** — Holds `tenantId` and `serviceId` for SOD request context.
- **`JKKSodResponseDTO`** — Holds `status` and `message` for SOD operation results.

These are simple POJOs with no methods beyond the defaults, designed for straightforward serialization and passing across processing boundaries.

### `com.optage.kopt.ekk` — Contract Processing

Two contract-processing classes:

- **`EKK0301A010`** — The primary contract processor. Its `process()` method handles contract processing, and its `notify()` method triggers downstream notifications by calling `KKW0100B001.trigger()` in the KKW package.
- **`EKK0301A020`** — A secondary contract processing path with no downstream dependencies.

### `com.optage.kopt.esc` — Service Control

Contains `ESC0101B001` with a `control()` method. This is an auto-generated fixture stub for a future ESC (Engine Service Controller) feature. The method body is empty and awaiting implementation.

### `com.optage.kopt.kkw` — Batch Trigger

Contains `KKW0100B001` with a `trigger()` method. It receives notifications from `EKK0301A010.notify()`. Currently a no-op fixture for the test harness.

### `com.optage.kopt.unrelated` — Test Fixture

Contains `XYZ99999Unrelated`, an intentionally isolated no-op class with zero dependencies. It exists solely to exercise the wiki-generation and code-analysis tooling. Not part of production logic.

## Getting Started

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

1. **Start with this overview** — you're already here.

2. **Read the DTO module** (`com.optage.kopt.dto`) — the two DTO classes are the simplest entry points and define the data shapes used throughout the system.

3. **Explore the batch entry points** (`com.optage.kopt.batch`) — understand how batch operations are initiated via `KKPRC14901`, `KKPRC24901`, and `KKPRC34901`.

4. **Read the business processing package** (`com.optage.kopt.bp`) — this is the orchestration layer that ties batch, DTO, and contract processing together. Focus on `JKKHakkoSODCC` as the central coordinator.

5. **Understand contract processing** (`com.optage.kopt.ekk`) — see how contracts are processed and how the primary class (`EKK0301A010`) triggers downstream notifications.

6. **Check the downstream modules** (`com.optage.kopt.kkw`, `com.optage.kopt.esc`) — these are currently stubs but are the targets of notifications from EKK.

7. **Look at the web tier** (`com.fujitsu.futurity.web.x33`) — review the filter and listener to understand the servlet infrastructure, and check `web.xml` for how the JSF `FacesServlet` is configured.

8. **Review the test fixtures** (`com.example.bugca002`, `com.optage.kopt.unrelated`) — understand what scaffolding code exists for the `SPEC-SCOPED-WIKI` test harness, so you don't mistake stubs for production logic.

### Key files to look at first

- `web.xml` — deployment descriptor showing filter, listener, and servlet configuration
- `src/main/java/com/optage/kopt/bp/JKKHakkoSODCC.java` — central SOD orchestrator
- `src/main/java/com/optage/kopt/dto/JKKSodRequestDTO.java` and `JKKSodResponseDTO.java` — data shapes
- `src/main/java/com/optage/kopt/ekk/EKK0301A010.java` — primary contract processor
- `src/test/java/com/optage/kopt/bp/JKKHakkoSODCCTest.java` — existing test scaffold

### Things to watch out for

- **No-op stubs are everywhere** — many classes contain auto-generated fixture code with empty method bodies. Don't assume a method is intentionally empty; it likely hasn't been implemented yet.
- **Naming conventions** — `KKPRC*` classes are batch runners, `JKKHakkoSOD*` classes are SOD business processing, `EKK*` are contract processors, `KKW*` are batch triggers. Use the prefix to guess the purpose of unfamiliar classes.
- **The X33 filter doesn't encode SJIS** — despite its name, `X33JVRequestEncodingSjisFilter` does not set any character encoding. If Japanese text support is needed, this filter needs to be implemented.