SQL to JPA @NamedQuery Conversion

SQL to JPA @NamedQuery Conversion

I'm looking for an intelligent way to convert this SQL statement into
@NamedQuery --if there is a way at all?
SELECT MONTH(dateField), sum(value) FROM mydb.records where status ='paid'
group by MONTH(dateField) order by MONTH(dateField);
I have a JPA @Entity called Record (Hibernate). This details all invoices
in the system that are created on daily basis. There will be many entries
per month. Each record will have a status of paid, overdue, value, and
lots of other info such as name and address of customer and so on etc.
The above statement basically summarises all the data on a month by month
basis and sums the value of all paid invoices per month giveing a summary
of all invoices paid in January, all paid in Feb and so on.....The result
looks somethings like:
datefield value
1 4500
2 5500
3 5669
The only way I can think of doing this using JPA @NamedQuery is to select
all records in the table that are of status 'pai'd and then use my Java
code to do the sorting, ordering and addition in a rather slow and ugly
fashion! Is there a clever way I can do this with @NamedQuery?
Thanks

Java: java.lang.NumberFormatException

Java: java.lang.NumberFormatException

do{
System.out.println("Input:\n(Consider the input is from the
sensor)\n");
temperature = Integer.parseInt(br.readLine());
examineTemperature(temperature);
System.out.println("Does the sensor wanna continue giving
input?:(y/n)\n");
c = (char) br.read();
}while(c!= 'N' || c!='n');
I don't understand where i went wrong because I am getting an error as
shown below in eclipse:
Input:
(Consider the input is from the sensor)
45
Temperature is 45 in celcius. Hmmm...
Thats 113 in Farenheit...
***The weather is niether too hot nor too cold***
Does the sensor wanna continue giving input?:(y/n)
N
Input:
(Consider the input is from the sensor)
Exception in thread "main" java.lang.NumberFormatException: For input
string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at tempdetection.main(tempdetection.java:33)
I got my answer and then its throwing this exception... If i press
Anything other than N it loops but again throws this exception.. Why so??

Preventing user from switching TabItem + Nasty bug?

Preventing user from switching TabItem + Nasty bug?

I have some validation logic and a TabControl. I want to prevent the user
from switching tabs when the current one contains some error.
I have found some people asking the same and some people gave good answers
as you can see here.
TabControl- preventing user from changing the selected tab: MessageBox
causing bug
HOWEVER, as Fredrik Hedblad tell, when a MessageBox is shown while the
selection is being canceled, the whole thing breaks down. It experiences a
strange behavior. The event stops being raised (apparently) and if you
minimize and restore the Window, it suddenly raised without interacting!!
Can somebody shed some light on this? Thanks a lot!!!

Understanding default behavior of branching?

Understanding default behavior of branching?

db 11gxe and apex 4.x
i created a master detail page , there are buttons on it by default , like
(cancel,delete,apply changes) and two buttons for getting the next order
and the previous one --there a master table for orders .
there are also branches created by default for the button getting the next
order and the button getting the previous one (the branch is conditional
ofcourse) -- the condition is when-button-clicked .
these branches are created automatically because the buttons are exist ,
and there are conditions which are "when-button-clicked" --just this
condition .
-- what i do not understand is that there are other buttons like "delete ,
cancel , apply changes" , and there were no branches created for them like
the other buttons which i mentioned above ,
although they also navigate like the other buttons , and the condition is
when-button-clicked as well ?
why in the first situation there are branches created automatically , and
in the last situation there are not ??
thanks in advance

Not able to change folder owner rights with chown on Mac OS X Server

Not able to change folder owner rights with chown on Mac OS X Server

I have an external hard drive used for storing and sharing files with
other computers in the network. After a power failure I had issues logging
into the workgroup manager and I noticed that LDAP wasn't running anymore.
I had to recreate the Open Directory Master settings and it seems that all
my previous user data and permission settings were lost.
Now I was able to get into the workgroup manager again and created new
users and put them in a new group ADMINISTRATION. I would now like to give
permissions to this group to read & write files on some folders of the
external drive.
I wanted to start doing that, but noticed that the Admin user (which I use
to login to the Mac OS X server) had no access to the folders on the
external drive. Therefore I thought I had to grant the Admin user read &
writing rights to those folders first.
So I open the Terminal and navigate to the Datadisk and use the command:
sudo chown -R Admin .
This should change the owner rights recursively I thought. When the
command was finished without errors, I checked the Datadisk and strange
enough I now have access to some folders and not to other folders. So I
navigated in the Terminal to one particular folder to test and used the
same command, but nothing changes.
What could be wrong? Hope somebody can help out, because I don't have
access to my data folders anymore so I'm not able to work at the moment.
Thanks in advance!

Python - file closed within with statement

Python - file closed within with statement

I have two versions of similar code, one works, the other doesn't:
version 1
#some code
with open('file', 'w') as f:
f.writelines(new_lines)
with open('file') as f:
i = 0
for line in f:
i = i + 1
if i != 5 and i != 18 and i != 27:
row.append(line)
version 2
# some code
with open('file', 'w') as f:
f.writelines(new_lines)
i = 0
for line in f:
i = i + 1
if i != 5 and i != 18 and i != 27:
row.append(line)
When executing the version 2 code, I got an error which says that the file
is not open. I got confused because obviously the code is still in the
with statement. Does the file get closed automatically right after the
f.writelines() method?

addFirst() in a custom LinkedList

addFirst() in a custom LinkedList

I'm working with a LinkedList of customLinkedLists and I'm having some
problems with the implementation of my AddFirst method.
Here's the method,
public void addFirst(GenericType data)
{
Node<GenericType> toAdd = new Node<GenericType>(data);
if(sizeCounter != 0)
{
toAdd.next = head;
head = toAdd;
sizeCounter++;
} else {
head = add;
tail = add;
toAdd.next = null;
sizeCounter++;
}
}
The problem is this increments the size correctly every time i call it,
but when I try to print out the values, it throws a null pointer
exception. I know there's a problem in the way I'm setting the head/tail
pointer but I cant figure out what it is exactly.

How do i install ubuntu from usb from scratch?

How do i install ubuntu from usb from scratch?

I want to install ubuntu from a usb from startup. without having windows
already installed.

Firefox is slow and lagging bad

Firefox is slow and lagging bad

I've been having troubles with Firefox lagging and crashing. It's got to
the point where It's caused my computer to lag and crash.
I'm using Ubuntu 12.04. I've been following all tutorials on Ask Ubuntu
and managed to find tutorials which helped and lasted for 5 minutes
maximum.
Does anyone have a clue what's going on and how to fix this problem? If
nothing works I'm probably going to stop using Ubuntu and use another
distribution.
Thanks, Shaun.