code to retrieve the values:
            def dbvalue= context["csvfile"] //csv file containing the data
            def count= context["dbrowcount"] //here the rowcount is 23
        for (i=0;i<count;i++)
            {def lines= ""
            lines= DBvalue.text.split('n')
            list<string> rows = lines.collect{it.split(';)}
            log.info "list is"+rows
            }

sample CSV file on which am working contains 600 column of data with 23 rows
abc;null;1;2;3;5;8;null
cdf;null;2;3;6;null;5;6
hgf;null;null;null;jr;null;II

currently am code is fetching the below output:
[[abc,null,1,2,3,5,8,null]]
[[abc,null,1,2,3,5,8,null]]
[[abc,null,1,2,3,5,8,null]]

desired output:
[1,2,3,5,8]
[2,3,6,5,6]
[jr,II]