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Is there any way to migrate custom Java application to Appian?
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If you mean a backend utility that does things behind the scenes:
You could convert your custom Java code into a plugin that can extend Appian. You can do this so that your Appian application uses much of the more complex logic that you already wrote in Java. Appian plugins are built in Java, so a lot of your stuff may function with little or no modification.
If you mean a front-end with screens and workflows and forms for users to fill out and actions that you can take:
Nope, sorry. For user interaction type applications, "migrate" means rebuild everything from scratch in Appian until it looks and functions mostly the same. You might be surprised how quickly that happens, though. Depending how complex, it might only be about as painful as a migration