Yes, turns out the groovy-yaml module is an optional module in Groovy 3, however groovy-yaml-3.0.17.jar is actually included in nifi-scripting-nar-1.23.2 but the ExecuteScript processor when started throws the exception I mentioned. Possibly this indicates there are other dependencies that would need to be explicitly included in the classpath (e.g. jackson-databind, jackson-dataformat-yaml, groovy-json) I was hoping to use YamlSlurper followed by JsonBuilder to do YAML to JSON conversions. In the end I used the Jackson YamlFactory and ObjectMapper to achieve the desired result.
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