CA Gen Migration

Our Automated CA Gen Refactoring solution delivers modern Cloud-enabled applications and databases that are functionally equivalent to their legacy counterparts, eliminating the hassle and expense of CA Gen (formerly known as IEF, Composer, COOL:Gen, Advantage:Gen, and AllFusion Gen) and the mainframe. This reduces cost, allows for deeper integration, and enables customisation to meet business requirements.

Our solutionResourcesRegister an interest

Discussing the 2022 Mainframe Modernisation Report

60 minutes

Watch on demand


Why modernise?


Scarcity of domain expertise

Developers who understand CA Gen and mainframe technology are reaching retirement age and no one is being trained to replace them, resulting in a steadily diminishing talent pool. As this shortage grows, the costs and risk of relying on CA Gen will continue to rise.

Limited flexibility

Companies are rapidly moving to modern environments and practices such as DevOps and the Cloud. CA Gen, the applications it generates, and the underlying systems that support them were not designed for modern IT, resulting in difficult integrations and limited flexibility.


Exorbitant costs

Mainframes running applications generated with CA Gen cost as much as 4,500 per cent more to operate than equivalent Cloud counterparts. This figure is compounded by rising licensing and maintenance fees for ancillary mainframe applications and databases. 

Automated CA Gen Refactoring


Our Automated CA Gen Refactoring solution preserves the benefits of legacy systems while empowering organisations to leverage the advantages of newer platforms, especially the Cloud. This unlocks a whole new world of quality and scalability from automated testing to quality assurance, and the ability to leverage containerised deployments and orchestration with Docker and Kubernetes.

Many CA Gen transformation solutions convert the generated COBOL from CA Gen, producing illegible, impossible to maintain Java or C#. In contrast, our Automated CA Gen Refactoring solution, harnessing a powerful combination of proprietary software and an iterative transformation methodology, uses the application definitions in the CA Gen encyclopedia. This delivers a modern, easily maintainable Java or C# application based on fully maintainable open systems.

Our Automated CA Gen Refactoring solution converts mainframe and client applications, as well as External Action Blocks, delivering a single application stack as the target end state. Functional equivalence, optimimum performance, and simple maintainability is maximised through the following assurances:

  • Refactored applications must remain functionally equivalent to their original counterparts
  • Refactored applications must be easily maintainable, attain SonarQube A ratings, and follow object-oriented concepts and paradigms
  • Refactored applications should perform as well as, or better than, the original applications
  • Refactored applications should be Cloud-ready and delivered using a standard DevOps toolchain and best practices

The entire inventory of CA Gen components supplied and scoped during the initial assessment is refactored to functionally equivalent Java or C# code using our proprietary software. This toolset is configured to support the options selected during the planning stages of the project. At the end of the modernisation process, the refactored code along with the supporting framework is packaged and delivered. This package includes:

  • Java or C# source and binary code for converted CA Gen procedures and Action Blocks
  • XML files for converted CA Gen flows used by the Advanced framework
  • Source code and compiled DLL for generated COM proxy classes for converted CA Gen server procedures
  • Source code and binaries for generated proxy classes for converted CA Gen server procedures
  • Java or C# source and binary code for the Advanced framework supporting execution of the target code, along with the framework documentation
  • Default configuration files

Once the CA Gen and its associated databases are refactored, Java and C# developers can extend application functionality for Cloud optimisation using standard DevOps tools and CI/CD concepts that simply aren’t available for mainframe applications.

Learn more

Over 35 years of CA Gen and mainframe modernisation experience

More than 500 successful modernisation projects completed

Over 2.5 billion lines of code refactored through automation

Intelligent modernisation, unparalleled experience


Additional resources to help you modernise



Modernising legacy CA Gen

This handbook covers a recent successful modernisation, as well as the business case and technical considerations for ditching legacy CA Gen.

Read handbook





CA Gen isn't COOL anymore


Watch to find out how modernisation can deliver mainframe class capabilities.

Watch on demand





2022 Mainframe Modernisation Report

Exploring the impact of the new era of digitalisation and change on the current state of legacy systems and organisations' modernisation plans.

Read report



Read blog angle-right-solid.svg

7 Oct 2022 by Rob Anderson, Vice President of Marketing and Product, Advanced

The CASE for modernising CA Gen

This blog outlines the importance of modernising your CA Gen environment and the different ways we can help implement this change.

Read blog angle-right-solid.svg

19 Apr 2021 by Rob Anderson, Vice President of Marketing and Product, Advanced

Read blog angle-right-solid.svg

28 Aug 2017 by Rob Anderson, Vice President of Marketing and Product, Advanced

News & Opinions

BLOG // 13-02-2024

How DevOps is influencing mainframe modernisation strategies

by Tim Jones, Managing Director - Application Modernisation

How DevOps is influencing mainframe modernisation strategies