AWS Mainframe Modernization Service (Managed Runtime Environment experience) will no longer be open to new customers starting on November 7, 2025. If you would like to use the service, please sign up prior to November 7, 2025. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see AWS Mainframe Modernization availability change.
Modify the source code with Blu Age Developer IDE
If you are using the AWS-managed AWS Blu Age runtime engine, you can use Blu Age Developer to modify the generated source code. You might want to do this if you need to update the modernized code for some reason, or if a portion of the legacy source code couldn't be modernized. You access Blu Age Developer through Amazon AppStream 2.0. This section describes how to set up Blu Age Developer on AppStream 2.0. It also explains how to use Blu Age Developer to update source code, using the sample application PlanetsDemo.
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