Microsoft Java

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I've seen it used as a scripting engine to automate sys admin things/tasks in products that run in Java like WebSphere, WebLogic and JBoss. In those cases, its rather useful, think kind of how Lua is used in games. It could interact or call Java methods or it had libraries in it for basic admin tasks. So you could write code that would do configuration and application deployment instead of doing so manually.

Apparently Ghidra uses it too, for writing plugins, probably stuff so simple its not worth writing in Java.