By 2020, GRAWE Group’s core application had grown to more than 6 million lines of code in the Natural programming language. The code was linked to other business applications via multiple interfaces, e.g., to the Adabas database management system, and used in parallel with a number of other technologies, from REXX procedures to assembler components.
Over time, it became increasingly difficult to maintain and update the application and its underlying data. GRAWE Group struggled with high mainframe maintenance costs and a dwindling supply of skilled talent with expertise in these legacy technologies.
Given these challenges, GRAWE engaged Deloitte Germany to decommission the mainframe and upgrade its systems by migrating the core application to a new target architecture. The goal was to convert the application to Java, migrate the data to Oracle and retire the old mainframe. In addition to the online application, Deloitte Germany migrated the batch environment, which comprised roughly 11,000 jobs and had already exhausted all VSE options prior to the project.