illinosis
asked on
not again............
hey all,
ive been trying to figure out how to solve a problem i am having
1)-java.lang.NullPointerEx
i get this problem when a user does not check a box (multiple test exam), and thus does not update the persons results in the databse.
How can i solve this??? anyone have any idea?
2) i was wondering how (using jsp and html) can i send a question to a user one at a time( the q are stored in an array), get the answer from the user , process the answer if correct go on to next q and repeat process, if wrong go to solution and how it is worked out page then after the user has read solution they can click on a carry on which will take them on to the next q. and the process continues untiul q finish.
i was thinking of doing it in a html page with frames the first being a jsp page which displays the q and the second being where the user can input their answers.
can neone help me out????
if so v grateful.
thanku ill.
ive been trying to figure out how to solve a problem i am having
1)-java.lang.NullPointerEx
i get this problem when a user does not check a box (multiple test exam), and thus does not update the persons results in the databse.
How can i solve this??? anyone have any idea?
2) i was wondering how (using jsp and html) can i send a question to a user one at a time( the q are stored in an array), get the answer from the user , process the answer if correct go on to next q and repeat process, if wrong go to solution and how it is worked out page then after the user has read solution they can click on a carry on which will take them on to the next q. and the process continues untiul q finish.
i was thinking of doing it in a html page with frames the first being a jsp page which displays the q and the second being where the user can input their answers.
can neone help me out????
if so v grateful.
thanku ill.
ASKER
kennethxu ...thanx 4 ure help will try out tmor.
>>BTW, you haven't follow up on your other questions for a long while, if you keep leaving your questions open without any update, you might find it is difficult to get help in future :)
im soz...when a q is answered and it helps i reward the points and thank the all the peps 4 their help. i will post up updates from now on (i didnt realise this b4
:( ...if u tell me the q that u wud like the update on i will go back to that q and post an update (i didnt realise people still viewed them after they had been answered)...
Thanku...and i will post u an update on this q tmor.
Ill
>>BTW, you haven't follow up on your other questions for a long while, if you keep leaving your questions open without any update, you might find it is difficult to get help in future :)
im soz...when a q is answered and it helps i reward the points and thank the all the peps 4 their help. i will post up updates from now on (i didnt realise this b4
:( ...if u tell me the q that u wud like the update on i will go back to that q and post an update (i didnt realise people still viewed them after they had been answered)...
Thanku...and i will post u an update on this q tmor.
Ill
just click on your name, you'll get the list of Q's belong to you. anyway this is the link:
https://www.experts-exchange.com/Web/Web_Languages/JSP/memberProfile.jsp?mbr=illinosis
it's better to let people know what's the result after you trid their comment, it given solution doesn't work, experts might give you another solution :)
https://www.experts-exchange.com/Web/Web_Languages/JSP/memberProfile.jsp?mbr=illinosis
it's better to let people know what's the result after you trid their comment, it given solution doesn't work, experts might give you another solution :)
ASKER
Hey kennethxu,
the exception handling worked.
But i am not too sure wat you mean for my second q. I get wat ure trying to say about session. but i dont get how to fire each q, from one page etc..i think i am getting confused.:(
the exception handling worked.
But i am not too sure wat you mean for my second q. I get wat ure trying to say about session. but i dont get how to fire each q, from one page etc..i think i am getting confused.:(
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
- Points to kennethxu
Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
girionis
EE Cleanup Volunteer
I will leave a recommendation in the Cleanup topic area that this question is:
- Points to kennethxu
Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
girionis
EE Cleanup Volunteer
if( request.getParameter( "checkboxname" ) == null ) {
// user didn't check the check box.
// you must handle this situation, otherwise NullPointerException.
}
>> 2) ....
you can save the current question number in the session:
store:
session.setAttribute( "questionNo", new Integer( questionNo ) );
retrieve:
Integer temp = ((Integer)session.getAttri
if( temp != null ) questionNo = temp.intValue();
BTW, you haven't follow up on your other questions for a long while, if you keep leaving your questions open without any update, you might find it is difficult to get help in future :)