@mburgess Matt, thank you so much for your quick response and help. It took me some time to figure out what you meant... but it works like a charm! If anyone can use the solution, here it is: //======================================================================================================
// TEST java LocalDate.parse with groovy max-function
// FF-Attribute RESPONSE contains [{"id":"(1208)", "datbis":"20180219" }, { "id":"(1210)", "datbis":"20191231" }, { "id":"(1212)", "datbis":"20200128" }]
// FF-Atribute MAX_datbis returns 20200128
//======================================================================================================
import java.time.LocalDate
def flowFile = session.get()
if(!flowFile) return
try {
def objList = new groovy.json.JsonSlurper().parseText(flowFile.getAttribute('RESPONSE'))
def max = objList.max {LocalDate.parse(it.datbis,"yyyyMMdd")}
flowFile = session.putAttribute(flowFile, 'MAX_datbis', max.datbis.toString())
session.transfer(flowFile, REL_SUCCESS)
} catch(e) {
log.error("Error while determining max", e)
session.transfer(flowFile, REL_FAILURE)
}
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