Read table field with getString()

Question

public String[] getExportSParams(JCO.Function function, String structure,
               String[]tablefield) {
          JCO.ParameterList export = function.getExportParameterList();
          JCO.Structure structures = export.getStructure(structure);
          String[] exportField = null;
          for (int i =0; i<tablefield.length;i++){
               exportField<i> = structures.getString(tablefield<i>);
          return exportField;

Answer 1

Bit confusing.
Assuming that what ever you had given in your question is exactly the "copy paste" from your code...
?Both "tableField" and "exportField" are arrays right.  Why are you using those variables directly in places where you are supposed to use a "String".
?You are trying to put some string into exportField (which is an array) which is not yet initialized.
Can you try this out -
/* I guess, you are trying to extract the content of the structure into an array of strings and send it back */
public String[] getExportSParams(JCO.Function function, String structure,
String[]tablefield) {
JCO.ParameterList export = function.getExportParameterList();
JCO.Structure structures = export.getStructure(structure);
String[] exportField = null;
if(tablefield!=null && tablefield.length>0)
        exportField=new String[tablefield.length];
        for (int i =0; i<tablefield.length;i++){
        exportField<i> = structures.getString(tablefield<i>);
return exportField;