Flink Stateful Functions https://nightlies.apache.org/flink/flink-statefun-docs-stable/ hasn't had an update in several years and is still compiled against an old version of Apache Flink.
I spent some time during the holidays uplifting it to Flink 2.2.0 https://github.com/fransking/flink-statefun/commit/25b2dfcc3feafd701eb2fec32d413fab56e1cfe6
Notionally it appears to be working as expected.
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