This was the code snippet that caused it:
try {
stmt = conn.createStatement();
myQueryString = "delete from groupnames where id=" + gid;
stmt.executeQuery(myQueryString);
The thing to notice is the query string. What it was doing, was deleting a record in a table. It wasn't a query so the line in red is incorrect.
It should have read:
try {
stmt = conn.createStatement();
myQueryString = "delete from groupnames where id=" + gid;
stmt.execute(myQueryString);
Notice that instead of executeQuery, because there is no query in a delete, it should merely read execute.
Hope this helps someone.
