[SOLVED] Exception in thread "main" java.util.NoSuchElementException

thevoice · #1 (**permalink**) 05-14-2008, 10:43 AM

Hello there,
I need to store resultset values in arrays.
Following is my code:
(Note : The function uses the jdbc connection with mysql that is return from other function.)
public static void getResultSetInArray(Connection con) throws Exception
{
Map list = new HashMap();
Statement stmt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY,Re sultSet.CONCUR_READ_ONLY);
ResultSet rs = stmt.executeQuery("show columns from launchcomm.events");
while(rs.next())
{
list.put(rs.getString("Field"),rs.getString("Type" ));
}
rs.close();
con.close();
System.out.println("List = " + list + "\n");
Iterator iter = null;
iter = list.keySet().iterator();
System.out.println("iter = " + iter);
String field;
String type;
int i=1;
System.out.println("list size = " + list.size());

while(iter.hasNext() != false)
{
System.out.println("iter.hasNext() = " + iter.hasNext() +"......" +(i++));
System.out.println("iter.next() = " + iter.next());
field = (String)iter.next();
type = (String)list.get(iter.next());
}
}
----
Following is my output with error:
List = {folder_name=varchar(50), is_repeat=tinyint(1), footer=text, thankyou_email=text, box_header_bg_color=varchar(25), organization_id=int(11), attendee_delete_right=tinyint(1), show_ticket_remaining=tinyint(1), order_confirmation_email=text, save_for_later=tinyint(1), start_register=tinyint(4), id=int(11), logo=varchar(100), publish=tinyint(1), end_unregister=datetime, owner_id=int(11), confirmation_email=text, audience_id=int(11), event_color_code=varchar(30), showcalendar=tinyint(1), registration_enddate=datetime, directory_name=varchar(20), eventstatus_id=int(11), contact_id=int(11), password_protect=tinyint(1), include_header=tinyint(1), thankyou_page=text, header=text, is_hotel_capacity=tinyint(1), want_close=tinyint(1), travel_housing_request=tinyint(1), box_header_text_color=varchar(25), default_location_id=int(11), end_reg_modification=datetime, user_id=int(11), passkey_eventcode=varchar(255), page_size=int(11), passkey_password=varchar(255), event_capacity=int(11), box_text_color=varchar(25), updated_on=datetime, link_color=varchar(25), ends_on=datetime, hotel_capacity=int(11), template_id=int(11), allow_overlap_session=tinyint(1), starts_on=datetime, reg_another_button=varchar(50), passkey_partnerid=int(11), personalized_url=tinyint(1), hide_start_date=tinyint(1), hide_end_date=tinyint(1), include_footer=tinyint(1), text_color=varchar(25), allow_another_registrant=tinyint(1), passkey_eventid=int(11), resize=tinyint(1), default_closetemplate=tinyint(1), dateformat=text, personalize_agenda=tinyint(1), cssfile_id=int(11), passkey_information=tinyint(1), confirmation_page=text, activate_waitlist=tinyint(1), box_border_color=varchar(25), google_analytics_code=text, show_iframe_design=tinyint(1), confirmation_mail_format=tinyint(1), url=varchar(100), bg_color=varchar(25), package_id=int(11), name=varchar(200), password=varchar(50), capacity=int(11), modify_registration=tinyint(1), is_event_capacity=tinyint(1), include_css=tinyint(1), passkey_username=varchar(255), created_on=datetime, promote_url=varchar(100), page_views=int(11), box_bg_color=varchar(25), title_text_color=varchar(25), registration_open_text=text, require_login=tinyint(1), closetemplate_description=text, registration_startdate=datetime, domain=varchar(200), timezone_id=varchar(100), description=text, tag=varchar(255), allow_unregister=tinyint(1), order_confirmation_page=text, css=text, showmap=tinyint(1)}

iter = java.util.HashMap$KeyIterator@18a47e0
list size = 95
iter.hasNext() = true......1
iter.next() = folder_name
iter.hasNext() = true......2
iter.next() = footer
iter.hasNext() = true......3
iter.next() = box_header_bg_color
iter.hasNext() = true......4
iter.next() = attendee_delete_right
iter.hasNext() = true......5
iter.next() = order_confirmation_email
iter.hasNext() = true......6
iter.next() = start_register
iter.hasNext() = true......7
iter.next() = logo
iter.hasNext() = true......8
iter.next() = end_unregister
iter.hasNext() = true......9
iter.next() = confirmation_email
iter.hasNext() = true......10
iter.next() = event_color_code
iter.hasNext() = true......11
iter.next() = registration_enddate
iter.hasNext() = true......12
iter.next() = eventstatus_id
iter.hasNext() = true......13
iter.next() = password_protect
iter.hasNext() = true......14
iter.next() = thankyou_page
iter.hasNext() = true......15
iter.next() = is_hotel_capacity
iter.hasNext() = true......16
iter.next() = travel_housing_request
iter.hasNext() = true......17
iter.next() = default_location_id
iter.hasNext() = true......18
iter.next() = user_id
iter.hasNext() = true......19
iter.next() = page_size
iter.hasNext() = true......20
iter.next() = event_capacity
iter.hasNext() = true......21
iter.next() = updated_on
iter.hasNext() = true......22
iter.next() = ends_on
iter.hasNext() = true......23
iter.next() = template_id
iter.hasNext() = true......24
iter.next() = starts_on
iter.hasNext() = true......25
iter.next() = passkey_partnerid
iter.hasNext() = true......26
iter.next() = hide_start_date
iter.hasNext() = true......27
iter.next() = include_footer
iter.hasNext() = true......28
iter.next() = allow_another_registrant
iter.hasNext() = true......29
iter.next() = resize
iter.hasNext() = true......30
iter.next() = dateformat
iter.hasNext() = true......31
iter.next() = cssfile_id
iter.hasNext() = true......32
iter.next() = confirmation_page
iter.hasNext() = true......33
iter.next() = box_border_color
iter.hasNext() = true......34
iter.next() = show_iframe_design
iter.hasNext() = true......35
iter.next() = url
iter.hasNext() = true......36
iter.next() = package_id
iter.hasNext() = true......37
iter.next() = password
iter.hasNext() = true......38
iter.next() = modify_registration
iter.hasNext() = true......39
iter.next() = include_css
iter.hasNext() = true......40
iter.next() = created_on
iter.hasNext() = true......41
iter.next() = page_views
iter.hasNext() = true......42
iter.next() = title_text_color
iter.hasNext() = true......43
iter.next() = require_login
iter.hasNext() = true......44
iter.next() = registration_startdate
iter.hasNext() = true......45
iter.next() = timezone_id
iter.hasNext() = true......46
iter.next() = tag
iter.hasNext() = true......47
iter.next() = order_confirmation_page
iter.hasNext() = true......48
iter.next() = showmap
Exception in thread "main" java.util.NoSuchElementException
at java.util.HashMap$HashIterator.nextEntry(HashMap.j ava:844)
at java.util.HashMap$KeyIterator.next(HashMap.java:87 7)
at GetDataTypeFromDB.getResultSetInArray(GetDataTypeF romDB.java:57)
at GetDataTypeFromDB.main(GetDataTypeFromDB.java:16)

---
I am unable to fine the reason for the exception.
Please help me to solve my problem.
Regards,
Thevoice

rjuyal · #2 (**permalink**) 05-14-2008, 12:42 PM

Code:

while(iter.hasNext() != false)
{
System.out.println("iter.hasNext() = " + iter.hasNext() +"......" +(i++));
System.out.println("iter.next() = " + iter.next());
field = (String)iter.next();
type = (String)list.get(iter.next());
}
}

convert this to:

Code:

while(iter.hasNext())
{
System.out.println("iter.hasNext() = " + iter.hasNext() +"......" +(i++));
field = (String)iter.next();
System.out.println("iter.next() = " + field);
type = (String)list.get(field);
}
}

What mistake was in your code was, u checked whether iterator is having NextElem if yes then get next 3 elems

, that is, probably, not what you wanted.

thevoice · #3 (**permalink**) 05-14-2008, 01:44 PM

Hello Mr.Rakesh

First of all thank you very much for your reply.
As you suggest me to change "while(iter.hasNext() != false)" to "while(iter.hasNext())".
I made that changes but error is still coming.
I wanna to know the reason of such error.
Can you explain me why such error occurs?
Is anything wrong in my code?

Regards,
TheVoice.

rjuyal · #4 (**permalink**) 05-14-2008, 01:48 PM

o dear, read my earlier post carefully it was not about changing
while(iter.hasNext() != false)" to "while(iter.hasNext())".

it was about using iter.next only once in loop

you used it thrice, please read my earlier post

thevoice · #5 (**permalink**) 05-14-2008, 02:00 PM

Hello Again Mr Rakesh

Thanks a LOT to make me correct.
My error get solved.
And i am sorry that i am unable to get what you trying to say in your reply

Regards,
TheVoice

rjuyal · #6 (**permalink**) 05-14-2008, 02:43 PM

ok, now close the thread as solved