Java Math(s) Parsing API [closed]

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Following on from my previous question, I was wondering if anyone knew of any free (as in beer, as in freedom would be nice but not essential) math(s) parsing libraries for Java. I found one called Jep which used to be open-source (ie: written by the community), but now costs $300 upwards (is this even legal?).

Any help appreciated!

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You can try the math expression parser from my Symja project.

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You may find my math expression evaluator useful; it's completely free and it's tiny.

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i released an expression evaluator based on Dijkstra's Shunting Yard algorithm, under the terms of the Apache License 2.0:

http://projects.congrace.de/exp4j/index.html

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I may just be daft but isn’t the old, GPL’ed Jep still available as open source?