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Jython. It's an unfinished research project/toy/proof of concept that never should have been used in a production environment under any sort of load. Unfortunately my predecessors made the wrong choice and I inherited that technical debt.

[seunosewa]

Can't you easily rewrite the critical parts in Java? (That should be much easier than writing C extensions for CPython.)

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The problems are in the core implementation of Jython, not in using Jython to solve problems. For example: http://bugs.jython.org/issue1634167