Migrating PL/I Code to Java

This paper reports on a project to migrate PL/I programs running on an IBM mainframe under Z-OS to Java. The key point is that the transformation of the Code to Java was fully automated using the PLI2Java code transformation tool. The paper describes how the PL/I code was first reengineered to raise the quality and to put it into a form from which it could be converted over to an object - oriented architecture. It then goes on to define the process used to translate the code into Java. No less than 8 steps are required to make the transformation using static singleton objects with string data attributes and methods based on locality of reference. The Java components produced are object-oriented and data independent. In the end the results of the transformation are summarized and conclusions drawn for future work.