UDF Function not processing Second record in the extracted list

we have JDBC to SOAP Scenario where We have successfully extracted Data from an SQL Table using JDBC Adapater , we are using a SOAP Receiver Channel to send the data in a below format

<Data>COL1;COL2;.......;COL18

DATA1[1];DATA2[1];......;DATA18[1]

DATA1[2];DATA2[2];......;DATA18[2]

</Data>

For this i had created a UDF function however the function only seems to process a single row of data not multiple.

public void FN_UDFConCat(String[] rowCount, String[] COL1, String[] COL2, String[] COL3, String[] COL4,.. STRING COL18, ResultList result, Container container) throws StreamTransformationException{

String delimiter = " ; ";

String columnHeader = "COL1;COL2;COL3;.......COL18";

String newLineCharacter = "\n";

String finalOutput = " ";

String value;

int i = 0;

finalOutput = columnHeader + newLineCharacter ;

//value = "IN";

//MappingTrace mt = container.getTrace();

for ( i = 0; i < rowCount.length; i ++)

{

//mt.addInfo(value);

finalOutput = finalOutput +

COL1[i] + delimiter +

COL2[i] + delimiter +

COL3[i] + delimiter +

COL4[i] + delimiter +

COL4[i] + delimiter +

COL5[i] + delimiter +

COL6[i] + delimiter +

COL7[i] + delimiter +

COL8[i] + delimiter +

COL9[i] + delimiter +

COl10[i] + delimiter +

COl11[i] + delimiter +

COl12[i] + delimiter +

COl13[i] + delimiter +

COL14[i] + delimiter +

COl15[i] + delimiter +

COl16[i] + delimiter +

COl17[i] + delimiter +

COL18[i] + delimiter +newLineCharacter;

}

result.addValue(finalOutput);

}