Returning an Object[][] gives NullPointerException - object

Question

I have an Access database which I need to retrieve all fields except the first and last and display it in a JTable. Everything works perfectly fine when I create my Object[][] but when i return it, i get a NullPointerException. I tried to find where there could be a null value in the database by printing the whole object out but that works fine and no values are null. Why would returning the Object[][] give me a NullPointerException and how can i fix it?
the stack trace is:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
public Object [] [] SetTrainingLogTable() throws SQLException
{
DatabaseConnection connection = new DatabaseConnection();
//Retrieves all the data from the TrainingLog table
ResultSet resultset = connection.SelectStatements("SELECT * FROM TrainingLog");
//Retrieves the number of entries
ResultSet numberofworkouts = connection.SelectStatements("SELECT COUNT(*) FROM TrainingLog");
int count = numberofworkouts.getInt(1);
number = count;
String[][] table = new String [count] [6];
//Number to incriment for while loops
int row = 0;
String date = "";
while(row<count)
{
date = resultset.getString(2);
table [row][0] = calculate.RefineDate(date);
table [row][1] = resultset.getString(3);
table [row][2] = resultset.getString(4);
table [row][3] = resultset.getString(5);
table [row][4] = resultset.getString(6);
table [row][5] = resultset.getString(7);
resultset.next();
row++;
}
Object[][] data = table;
connection.close();
return data;
}
I ran a debugger and it only gives the error when the return line is run.

Answer 1

It's best to post the stack trace and tell which line is raising the error. However, the typical way of writing such code is:
Connection con = ...;
Statement st = ...;
ResultSet rs = ...;
while (rs.next()) {
// ...
}
The result set starts out pointing before the first row. rs.next() returns whether there is a next row, and advances to it if it exists. Can you rewrite it in that style?
Other suggestions:
Can you create an actual object type instead of using Object[] to store the data from each row? Call it Workout.
Can you use a List<Workout> instead of your Object[][]?
Is the date stored in the database as a SQL DATE or TIMESTAMP? Then, don't convert it to a Java String: use java.sql.Date or java.util.Date. At work, I have a large old program that uses strings for dates, and it uses different formats to convert the values at different times. It's pretty miserable.
Don't use SELECT *. Give the names of the columns to return. Use the rs.getString("column_name") syntax.
There's no need to set one variable to the returned table and immediately set another variable to it.
Closing the connection or statement should be done in a finally block, or by try-with-resources.