I'm trying to run the following corba/jdbc program using Java IDL but it raises the CORBA_BAD_PARAM. It seems to be working fine from the client to server toDBase.Its completion status is maybe.What am i missing?

module mytrial{
typedef sequence cols;
typedef sequence resultSet;
interface MyLibrary{ resultSet viewMyBooks(in string userid);};
};
/* my server implementation*/
public String[][] viewMyBooks(String userid)
{ String[][] rows = null;
String uid = userid;
try { /* create connection,statement*/
ResultSet rs = stmt.executeQuery(query);
......Vector v = new Vector();
int numCols =
rs.getMetaData().getColumnCount();
while(rs.next())
{String[] rowData = new Strin[numCols];
for(int i=0; i < numCols ; i++)
{ rowData[i] = rs.getString(i+1);}
v.addElement(rowData);}/*end of while*/
rows = new String[v.size()][numCols];
v.copyInto(rows);
return rows; }/*end of method defn*/
Thanks