Project Background

It was a project under public sector department, to rewrite AS/400 RPG printing programs by using Java.

There were about 15-20 reports that generated by RPG program, and printed by AS/400 integrated laserjet and inkjet printers. The goal was to transform the AS/400 report spool file to pdf format. The pdf reports would be made open and accessible through RESTful API.

This was definitely a challenging project due to the complexity of legacy RPG million lines of code logic. A lot of effort has been put into RPG code analysis, line by line code review was crucial to ensure the PDF report layout exactly the same as RPG one.

Functional Requirements

Rewriting RPG printing programs using Java, to generate PDF reports with the exact same layout.

Application Architecture

System Architecture

Technology Stack

Category	Details
Java JDK	Java 1.8 javaee-api 8.0
Java printing	iText 7.1.11
Java persistence	jt400-jdk8 10.3 spring-data-jpa 2.2.0.RELEASE Hibernate 5.4.6.Final
Spring	Spring Framework 5.2.0.RELEASE
Java logging	tinylog 1.3.5
Java util	Apache commons-lang3 3.0 Apache commons-dbcp2 2.7.0 Apache commons-io 2.6 Apache commons-collections 2.1.1 Google guava.guava 29.0-jre Google guava-collections r03 lombok 1.18.12
CI/CD build & test	JUnit 4.12 Maven 3.5.0 Jenkins 2.263.4 Github
Database	iSeries AS/400 v6
IDE	Eclipse Java EE Oxygen 1 Release 4.7.1 AS400 Program Development Manager (PDM)
Deployment platform	Kubernetes 1.7 on RHEL 7

Roles & Responsibilities

I worked as the software engineer and IT project manager, responsible for the below end-to-end implementation tasks:

IT Project Manager:  progress tracking, dev team co-ordinate, status update, cost control.
System Architect:  application and system architecture design.
Technical Business Analyst:  RPG code analysis, report layout analysis.
Developer:  Java application development, testing, Kubernetes env setup & deploy.