Well we’ll need to see the stacktrace from the exception and proof (line numbers) that the exception is in the code you
sent.
> On Sep 2, 2019, at 11:15 PM, Karen Goh <karenworld@yahoo.com> wrote:
>
>
>
> Hi Rob,
>
> I am still getting the same type of error even if I store it in another List...
>
> CopyOnWriteArrayList<String> subList = new CopyOnWriteArrayList<>();
>
> subList.add(rs.getString("subject_name")); // note: using a new List
>
> Are there anybody experienced Java developer that can help ?
>
>
> On Tuesday, September 3, 2019, 9:12:34 AM GMT+8, Rob Sargent <robjsargent@gmail.com> wrote:
>
>
>
>
> > On Sep 2, 2019, at 12:28 AM, Karen Goh <karenworld@yahoo.com> wrote:
> >
> > Hi experts,
> >
> > I have been trying to find a solution in the internet but there is only 1 solution offered by stackoverflow in
whichthe user uses if it is not there then use a else to print out there is no more data/row that appeared in that
column.
> >
> > Basically, I was trying to get a List<String> which meet certain search condition so the data will come from 2
tables- one of which is a column from a join table and the List<String> falls under this table.
> >
> > So, here's the code that I attempt to get the data out but keep getting ResultSet not positioned properly.
> >
> > String[] subjectNames = request.getParameterValues("txtsubjects");
> > String zipcode = request.getParameter("location");
> > List<String> subjList = new ArrayList<String>(Arrays.asList(subjectNames));
> > List<tutor> myList = new ArrayList<>();
> > ArrayList<String> subList = new ArrayList<>();
> > CopyOnWriteArrayList<String>newSub = new CopyOnWriteArrayList<String>();
> > tutor t = new tutor();
> >
> >
> > String sql1 = "select t.tutor_contact_no, t.zipcode, t.tutor_id, t2.subject_name FROM s_tutor t JOIN tutor_subject
t2ON t.tutor_id = t2.tutor_id where t.zipcode = ? And t2.subject_name = Any((?))";
> >
> > PreparedStatement ps2 = connection.prepareStatement(sql1);
> > ps2.setString(1, zipcode);
> > for (int i = 0; i < subjectNames.length; i++) {
> > Array array = connection.createArrayOf("text", subjList.toArray());
> > ps2.setArray(2, array);
> > }
> > ResultSet rs = ps2.executeQuery();
> > while (rs.next()) {
> > t.setContactNo(rs.getString("tutor_contact_no"));
> > t.setZipcode(rs.getString("zipcode"));
> > t.settutor_id(rs.getInt("tutor_id"));
> >
> >
> > for (String s: subjList)
> > if (s.contains(rs.getString("subject_name")))
>
> Are you sure you want to add to the subList you’re iterating through?
>
> > subjList.add(rs.getString("subject_name"));
> > newSub.addAll(subjList);
> > }
> > myList.add(t);
> > request.setAttribute("tutors", myList);
> > request.setAttribute("sub", newSub);
> >
> > Please. I hope someone can tell me what's wrong with the code or how to overcome this error...I have been
strugglingfor 2 weeks already.
> >
> > Thanks.
> > }
> > myList.add(t);
> > request.setAttribute("tutors", myList);
> > request.setAttribute("sub", newSub);
> >
> >
> >
>
>
