No such property: expected for class: Script1343 (in groovy script); - groovy

Question

I am trying to retrieve data from oracle db but getting No such property: expected for class: Script1343 (in groovy script); error
import java.util.Properties;
import java.io.InputStream;
import groovy.sql.Sql;
def url = 'jdbc:oracle:thin:#//localhost:1521/TEST'
def user = 'DB'
def password = 'DB'
def driver = 'oracle.jdbc.driver.OracleDriver'
def sql = Sql.newInstance('url', 'User', 'password','oracle.jdbc.driver.OracleDriver')
sql.withStatement {
stmt -> stmt.queryTimeout = 30
print "Request TimeOut"
}
def rowNum = 0
sql.eachRow("SELECT DISTINCT CST_START_DT_PF,CST_ITEM_NUM_PF FROM COST "){ row ->
def first = row[0]
def middle = row.CST_START_DT_PF
def one = row.CST_ITEM_NUM_PF
assert expected[rowNum] == "$CST_START_DT_PF, $CST_ITEM_NUM_PF"
}

Answer 1

There are several things wrong. The specific error you asked about is the result of the following:
assert expected[rowNum] == "$CST_START_DT_PF, $CST_ITEM_NUM_PF"
You are referencing a variable expected which doesn't exist.
You didn't ask about the things below but other problems you are going to run into...
Referencing $CST_START_DT_PF and $CST_ITEM_NUM_PF is going to be a problem because they also don't exist, at least not in a way that your code will work.
You also are probably going to get unexpected results related to the fact that you are never incrementing rowNum.