Am I really stuck with OS4 on my 3G?
After updating to version 4, my phone is so slow, it's unusable. Does anyone know of an "apple Approved" way for me to go back to 3.x?
Thanks!
Mine has become slow, apps keep crashing, even after re-installing them, the phone does some really odd things, I will select one app and sometimes another will open?--this is wierd! I have already re-installed os4 incase it was an error during the original install but it is the same! My wi-fi signal is weak now, even when i sit next to my router. I HATE OS4
Similar Messages
-
Really stuck with iPad mini since iOS7 download
I downloaded iOS7 onto my iPad mini last night, when I woke up this morning the passcode no longer worked. I cannot get into the iPad to shek the IMEI number (something Apple don't seem to be able to talk to me without), I didn't set up the mini by syncing to a mac and cannot seem to restore either. This is really frustrating as it actually feels as though it's Apple's fault...can any one help me resolve this? I tried the emergency restore through itunes but stops halfway through to say it cannot complete restore to a passcode restricted device...I really am stuck
Hi dataman.co.uk,
Welcome to the Support Communities!
The article below may be able to help you with this.
Click on the link to see more details and screenshots.
iOS: Forgotten passcode or device disabled after entering wrong passcode
http://support.apple.com/kb/HT1212?viewlocale=en_US
If you have never synced your device with iTunes, or you do not have access to a computer
If you see one of following alerts, you need to erase the device:
"iTunes could not connect to the [device] because it is locked with a passcode. You must enter your passcode on the [device] before it can be used with iTunes."
"You haven't chosen to have [device] trust this computer"
If you have Find My iPhone enabled, you can use Remote Wipe to erase the contents of your device. If you have been using iCloud to back up, you may be able to restore the most recent backup to reset the passcode after the device has been erased.
Alternatively, place the device in recovery mode and restore it to erase the device:
Disconnect the USB cable from the device, but leave the other end of the cable connected to your computer's USB port.
Turn off the device: Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then slide the slider. Wait for the device to shut down.
While pressing and holding the Home button, reconnect the USB cable to the device. The device should turn on.
Continue holding the Home button until you see the Connect to iTunes screen.
iTunes will alert you that it has detected a device in recovery mode. Click OK, and then restore the device.
Cheers,
- Judy -
I am really stuck with JCheckBox using it as a JTable cell editor...
i need to focus next table cell, when user press a key on JcheckBox used in JTable as a cell editor.
Especially i need to bind "ENTER" key with this action. I tried to addKeyListener do checkbox, tried to add action into input maps of jatble, and also to input map of checkbox. But really nothing works. Please help....
Mathew, HSIGPand yes your code works well with any key, but when i want to assign something to "ENTER", it doesnt work. F.ex. if i assign something to "A" key
like>
InputMap m=table.getInputMap(WHEN_ANCETSTOR...);
m.put(KeyStroke.get("A"),m.get(KeyStroke.get("TAB"));
it works fine, and when i press "a" key it work as a "tab" key in table.
But when i am doing same with "enter" instead of "a" it doesnt work.
btw. there is action "actionselectNextCollumn..." assigned by default to enter
why?? -
Really stuck with multipart message...
I post below the essence of my code... I read a lot of pages on the internet but my multipart message doesn't want to work :
With Outlook the mailer says that the encoding is unsupported and it attaches the multipart as a text file...
In outlook express the message is ok but the images used as datasources are attached a second time, as regular files. I have checked everything several times...
Thanks for any hint, I lost my day :-(
I use javamail API 1.3, jaf 1.0.2, jdk 1.3.1
I have an ArrayList for the datasources, one for their headers, another one for the urls to the fiels to attach and a last one for the file names. I have 3 datasources (gif images) and 2 attachments (xml and pdf). The multipart message code is snipped at the bottom.
Barbara
// creates mail session and mime message
this.mailSession = javax.mail.Session.getDefaultInstance(this.props, null);
this.msg = new MimeMessage(mailSession);
MimeBodyPart mbp1 = new MimeBodyPart();
Multipart mmp = new MimeMultipart();
//set from, to and cc fields ok
try{
this.msg.setSubject(this.subject,this.mimeCharSet);
this.msg.setSentDate(new java.util.Date());
catch(Exception e){}
// html ?
try{
if(html){
mbp1.setContent(this.body,"text/html");
mbp1.addHeaderLine("Content-Type: text/html;charset=" + this.mimeCharSet +"\"");
mbp1.addHeaderLine("Content-Transfer-Encoding: quoted-printable");
else{
mbp1.setContent(this.body, "text/plain");
mbp1.addHeaderLine("Content-Type: text/plain;charset=" + this.mimeCharSet +"\"");
mbp1.addHeaderLine("Content-Transfer-Encoding: 8bit");
mmp.addBodyPart(mbp1);
catch(Exception e){System.out.println("bug with content : " + e);}
// datasources and headers
try{
if(this.dataSources != null){
for(int j=0;j < this.dataSources.size();j++){
BodyPart mbp2 = new MimeBodyPart();
javax.activation.DataSource aSource = new URLDataSource(new URL((String) this.dataSources.get(j)));
mbp2.setDataHandler(new DataHandler(aSource));
mbp2.setHeader("Content-ID",(String) dsHeaders.get(j));
System.out.println("added datasource : " + this.dataSources.get(j));
mmp.addBodyPart(mbp2);
catch(Exception e){
System.out.println("bug with add datasources " + e);
// other attachments
try{
if(this.file != null){
for(int j=0;j < this.file.size();j++){
BodyPart mbp2 = new MimeBodyPart();
javax.activation.DataSource aSource = new URLDataSource(new URL((String) this.file.get(j)));
mbp2.setDataHandler(new DataHandler(aSource));
System.out.println("attached file : " + this.file.get(j));
try{
mbp2.setFileName((String) fileName.get(j));
catch(Exception e){// no filename
mmp.addBodyPart(mbp2);
this.msg.setContent(mmp);
catch(Exception e){
System.out.println("bug with add files " + e);
try{
javax.mail.Transport.send(this.msg);
catch(Exception e){
System.out.println("send mail failed : " + e);
Now the multipart message :
Received: from <snip> with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2650.21)
id P63WS3KF; Mon, 9 Sep 2002 16:57:07 +0200
Message-ID: <4650852.1031581670610.JavaMail.[snip]>
Date: Mon, 9 Sep 2002 16:27:49 +0200 (CEST)
From: =?iso-8859-1?Q?Barbara=A0Post?= <[snip]>
To: <snip>
Subject: Some subject
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="----=_Part_0_8194658.1031581669238"
------=_Part_0_8194658.1031581669238
Content-Type: text/html;charset=iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<snip of html code>
------=_Part_0_8194658.1031581669238
Content-Type: image/gif
Content-Transfer-Encoding: base64
Content-ID: 69zzz@pc01
<snip of first included image code>
------=_Part_0_8194658.1031581669238
Content-Type: image/gif
Content-Transfer-Encoding: base64
Content-ID: 69zzz@pc00
R0lGODlhAQABAID/AMDAwAAAACH5BAEAAAAALAAAAAABAAEAQAICRAEAOw==
------=_Part_0_8194658.1031581669238
Content-Type: image/gif
Content-Transfer-Encoding: base64
Content-ID: 69zzz@pc02
<snip of third included image code>
------=_Part_0_8194658.1031581669238
Content-Type: text/xml; name=nop41.xml; charset=Cp1252
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment; filename=nop41.xml
<snip of xml attachement code>
------=_Part_0_8194658.1031581669238
Content-Type: application/pdf; name=nop41lt.pdf
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=nop41lt.pdf
<snip of pdf attachement code>
------=_Part_0_8194658.1031581669238--Basic message structure required is
*{HEADERS}
*{MULTIPART MIME MESSAGE (RELATED)}
*>>>{PART 1 MULTIPART PART (ALTERNATIVE)}
*>>>>>>{PLAIN TEXT PART}
*>>>>>>{HTML TEXT PART}
*>>>{END PART 1 MULTIPART PART (ALTERNATIVE)}
*>>>{PART 2 INLINE IMAGE FILE (GIF/JPEG etc}
*>>>......
*>>>{PART n }
*{END MULTIPART MIME MESSAGE (RELATED}
Snippet of code I use, but be aware all the html references to images etc are converted to cid:xxxxxxxxxxxx format outside of this code. No point in sending the image in the message if you refer to it by a url like http://www.foo.org/image1.gif
SH
<Code Snippet>
// create a message
msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
msg.setSubject(subject);
// create and fill the first message part with the Title and plain text
MimeBodyPart mbpa1 = new MimeBodyPart();
mbpa1.setText(ho.getTitle() + "\n" + ho.getText());
mbpa1.addHeaderLine("Content-Type: text/plain; charset=\"iso-8859-1\"");
mbpa1.addHeaderLine("Content-Transfer-Encoding: quoted-printable");
// Create and fill the second message part with the HTML code
MimeBodyPart mbpa2 = new MimeBodyPart();
mbpa2.setText(ho.getHTMLCode());
mbpa2.addHeaderLine("Content-Type: text/html; charset=\"iso-8859-1\"");
mbpa2.addHeaderLine("Content-Transfer-Encoding: quoted-printable");
// create the Multipart and its parts to it
Multipart mp = new MimeMultipart("related");
Multipart mp2 = new MimeMultipart("alternative");
mp2.addBodyPart(mbpa1);
mp2.addBodyPart(mbpa2);
MimeBodyPart mbp1 = new MimeBodyPart();
mbp1.setContent(mp2);
mp.addBodyPart(mbp1);
if (inline) {
// Enumerate the Image Names and add them to the message
for (Enumeration e = ho.getImageNames(); e.hasMoreElements();) {
String str = e.nextElement().toString();
MimeBodyPart mpi;
URL url2;
String fullStr = ho.getImageUrl(str);
if (inlineAll || ho.isImageLocal(fullStr)) {
if (debug)
System.out.println("Adding: " + fullStr);
url2 = new URL(fullStr);
mpi = new MimeBodyPart();
URLDataSource fds2 = new URLDataSource(url2);
mpi.setDataHandler(new DataHandler(fds2));
// mpi.addHeaderLine("Content-Location: " + fullStr);
if (ho.getCidValue(str).length() > 0)
mpi.setHeader("Content-ID", ho.getCidValue(str));
mp.addBodyPart(mpi);
// add the Multipart to the message
msg.setContent(mp);
// set the Date: header note that the java.sql package also defines date
msg.setSentDate(new java.util.Date());
</Code Snippet> -
Really stuck with speeding up and slowing down clips
Hi gang,
I have been reading the Final Cut manual for the last hour and fooling around with my clips, but I can't get the effect that I want.
I have a clip (CGI of a star field moving towards the observer) that I want initially to be frozen, then I want the clip to accelerate rapidly, and then end at about double normal speed. I thought I would be able to use keyframes and specify the playback rate at given points, but that option doesn't seem to exist. I have been playing with variable and constant speed settings, but these don't seem to work either.
Ideally, the clip would go like this:
1) first frame of original footage is frozen for 2 seconds.
2) the original footage then begins playing, accelerating rapidly from frozen to double speed over 2 seconds.
3) remainder of original footage plays at double speed until complete.
I feel like I am missing something obvious, but I can't get it to work!
Any suggestions appreciated.
Cheers!Dude, I have the same problem. I found a picture/text tutorial on how to slow down, speed up and reverse all in one clip w/o chopping it up, but it was for FCP 4. I have 5 and when I ramp the green line down it speeds up, doesn't slow down. Is it just me or is the effect changed from FC4 to FC5.
I'm looking for a great video tutorial for FC5 or similar on how to slow, speed up and reverse a clip using the Time Remap Tool in FC.
If it's a DVD I have to buy so be it.
Thanks everyone. -
I've gotten myself really stuck with my css layout. I've
basically followed a couple of different tutorials to get where I
am. if you'll visit
http://eliteportraits.com/teetest/
you can see the effort so far. Where i'm stuck is the main content
block. I read different things on nesting div tags and can't figure
out how to do this with or without nested tags. I basically want a
white background for everything under the purple menu bar (I'd also
like that bar to extend to the edge of the top rounded white
graphic.). I ca't seem to make it work. what am I screwing
up/missing? is there a tutorial somewhere that can help? This is
the last thing I've got to figure out before I can finally move
forward. thanks so much for any help.
Markeliteportraits wrote:
> If you look to the logo on top of the page (above the
purple bar), there's
> text immediately to the right of the logo that says
"some menu links here, like
> shopping cart and such" - I would like that line of text
to sit on top of the
> purple bar (about 10px above the purple bar) and be
aligned to the right edge
> of the page. right now the text is aligned with the top
of the image.
Then you need to put that line of text in its own container,
a <div> <p>
<h> whatever. Lets just use another <div> for
now. Insert the new <div>
in your pages code, right after your logo image (see below)
<div id="top">
<img src="tutorial_files/logo.jpg">
<div id="topRight">some menu links here, like shopping
cart and
such</div><!-- end topRight -->
</div><!-- end top -->
Then use some css to style/position the new <div>
#topRight {
float: right;
width: 350px;
text-align: right;
padding-top: 65px;
Back-tracking on what I said yesterday about
relative/absolute
positioning you could also make the 'top' <div> have a
position of
relative and then the 'topRight' <div> a position of
absolute to place
it in the position required.
#top {
position: relative;
#topRight {
position: absolute;
top: 85px;
right: 0;
width: 350px;
text-align: right;
This is one of the only times you should need to use relative
positioning on a container i.e., when you require an
absolutely
positioned element to sit within it. However if there is an
alternative
way of achieving the same results then personally I would
always use
that method in preference. Many beginners just use relative
positioning
all over the place without really understanding what they are
doing. Not
all, but in the majority of cases, it is not required.
Don't be afraid to experiment with css to see what results
can be
achieved using various combinations. Once you grasp the
basics then the
rest will fall into place quite quickly.
The key is to think boxes being positioned by using
margin/padding.
Where people go wrong is they tend to use too many boxes
which results
in too many elements to keep track of or just plain don't do
the maths
needed to make css work.
Always comment the end of a container </div><!-- end
header --> or you
can put the comment inside the closing tag <!-- end header
--></div>
This will make it easier to identify them when the page gets
more complex. -
Can somebody help me install IOS 6.1.3 back to my iPhone 4. IOS 7 or 7.0.4 is not smooth enough as perfect as IOS 6.1.3. I am stuck with this OS, every app gives a break for 4-5 seconds to open up. And playing games in this OS using iPhone 4 is really crazy. Very much disappointed that I am not able to use IOS 7 and cant go back to what I need.
Mani Dinesh wrote:
Can somebody help me install IOS 6.1.3 back to my iPhone 4.
Downgrading is not supported by Apple.
Mani Dinesh wrote:
...every app gives a break for 4-5 seconds to open up. ...
See this discussion...
https://discussions.apple.com/message/23731048#23731048 -
whenever i connect my ipod touch 3rd gen to itunes itunes responds really slowly and when i try and sync it it says sync in progress on my ipod screen but then is stuck with "verifying "matts ipod" at the top of itunes and stays like that for ages.. help
You buy one and only one download.
As it should have been transferred to your computer when you synced, you can contact itunes support and ask for an exception.
http://www.apple.com/support/itunes -
Now it's stuck with the progress bar less than a quarter full. I have also tried resetting through itunes which works right up to the point where itunes states that it needs the passcode to be inputted into the ipad to connect to it. At which point it then sticks at the same progress bar point. HELP!! please, this ipad is really important to my work.
Well the term "hotlined" I have never heard before. In any case many states (like NY) just passed regulatory powers to the State Public Service Commission of which it may be called something different in your state. You could file a complaint with them. Or file a complaint with your state attorney generals office, they also take on wireless providers.
The problem here is the staff you speak to are poorly trained, in days gone by it took one call to them and they pulled up your account and see the error and had the authority to remove any errors. They did not remove legitimate account actions, but used their heads instead of putting a customer off or worse lying to the customer.
Its a shame you have to go through what you going through.
Good Luck -
App will not download to iPad when purchased from App Store - stuck with Cloud icon
Device : iPad Air 32gb wi-fi model (not cellular data)
OS version : 7.1.1 (up to date)
Location : UK
Problem : App will not download to iPad when purchased from App Store - stuck with Cloud icon
Last night I tried to download an app over wi-fi onto my iPad Air, but the app did not install.
I have plenty of space (the app is 24.1mb, I have 3.4gb free space) and there are no restrictions whatsoever on my iPad - no blocks on App store purchases, no age-related restrictions, no country restrictions etc.
Normally from the App Store page you would tap the price (in this case the app was free), enter your iTunes password, and the app would download.
Also a new icon appears on the home screen and a circle shows the progress of the download.
However this did not happen.
Instead I have the Cloud icon (the one that shows when you have bought an app but it is not currently installed on your device) and a message that says "You've already purchased this, so it will be downloaded now at no additional cost".
If I press OK I am then prompted to enter my iTunes password, the Cloud symbol briefly changes to a circle (and I mean for a split-second, like the blink of an eye) and then the Cloud symbol appears again.
The app does not download - in fact it does not even *attempt* to download.
I have tried this >20 times now and it always occurs excatly like this.
After Googling this problem (which seems common) and reading over a dozen threads on this forum plus Apple's own official support pages, this is what I've tried:
I can re-download other apps that I have previously purchased on this iPad, with no problems.
I purchased another app on my iPhone 5 and was then able to download onto my iPad with no problems.
I have reset my iPad >5 times - both by pressing/holding the home/power buttons, and also a full switch off and restart.
I have logged out of my iTunes account on the iPad, and logged back in.
The wi-fi is Virgin Media fibre optic broadband with a verified speed of 20 meg (confirmed by Speedtest) plus an 802.11-n Belkin router and my iPad will happily load web pages, stream videos on YouTube, download other apps etc.
I have reset/rebooted my internet connection
In an attempt to eliminate by broadband connection from the possible causes, I have switched off my router, linked my iPad to the hotspot feature on my iPhone and tried to download the app over cellular data, but still cannot download the app.
I have tried on 2 other wi-fi networks but still cannot download this one app.
My iTunes account has a cerdit balance from an iTunes card, but the app was free anyway
Nothing I try will download the app in question.
The app is iPad only, so I cannot install on my iPhone to try and kick-start the process.
I guess I could install the app on my computer and then sync the iPad, but that's *working around* the problem - it's not *fixing* the problem.
(Since getting the iPad I use almost never use my computer. And anyway what if I did not have a computer? Didn't iOS go "PC-free" with version 5?)
I would like to call Apple but my 90-day telephone support has expired (the iPad is around 6 months old) and I don't want to buy Apple Care for this one problem.
I can't make it to an Apple Store to speak to a Genius.
Bearing in mind the list of things I've already tried, what do I do next?
Thanks in advance for any support.Hi there.
Thank you very much for your quick reply, it's really appreciated.
No need to apologize, I actually found the phrase "If your iPad ever craps the bed" amusing under the circumstances
I checked the list of installed apps like you suggested (Settings>General>Usage>Storage>Show all apps) but this problem app is not in the list. I have also swiped down on the home screen to search for it, but again it does not show.
While it has not let me download the app (and I just tried it again) it has helped me to eliminate a few things from the list of what to try, and I can definitely conclude that it has not downloaded.
I guess I need to fire up my PC and download it / sync my iPad.
Thanks again for your help -
Hello, Im trying to upgrade Imovie and whatever app are about to update in the future, the problem is the my Imac is stuck with an old email on the APP store. I try to change it and nothing happen, when I put my apple ID it send me to change the password and what Im trying to do is to put my new email in the system so would be able to update my computer. You know when you press the update button a little box drop with your email and all you have to put is your password thats where my old email is stuck pls someone help me with that little problem i'll appreciate it... thanks
An Apple ID isn't necessarily "linked" with your email other than for recovery reasons. So, as long as you know the Apple ID password, an old email isn't catastrophic. Apple ID != e-mail.
Now, if it's really bugging you and you really want to change it, if you log in to http://appleid.apple.com and change your primary email address, this should update your Apple ID. There will be a couple hoops involved with this (i.e. verification of email change by sending email to rescue/alternate email. Alternate email can't be the same as the new primary. The new primary can't have ever been used as/with an Apple ID. etc...). -
Stuck with intersecting paths and shaped gradients - instructions requested
Hi guys,
I'm new to this forum as this is my first post here, but I'm stuck with a problem in Illustrator and haven't been able to find the specific solution in other places on the net so far.
Please have a look at the following design (can't seem to get the image up on this forum):
http://www.mediafire.com/?pq7mjm4yx65r5cv
This design has been first created in GIMP and now I want to redo it in Illustrator. I'm using CS6. I haven't been using Illustrator for very long, and I can't seem to get this part right.
The areas highlighted in red (the shadows) are the major issue. To be able to get a 'folded' effect, I would like to apply subtle shadows on the visible areas of the lower ribbons, where they intersect with the ones on top, as the sample illustrates.
I don't know how to achieve this effect. This is what I have tried so far:
- Simple drop shadows, but of course they run outside of the visible areas of the ribbons.
- I have also tried rectangular selections with a gradient from black to transparent, but for some reason those look right on the silver part of the design, but turn out brown-ish on the blue part. Besides, this is a lot harder to do on the curved sections you can see in the middle.
Is there a simple way to do this in Illustrator? I have a gut feeling the solution lies somewhere in the pathfinder tool and/or clipping masks, but I'm not really confident as to how to make those work for me.
As a secondary issue, I would like to get the same 1px bevel/emboss effect as the sample image shows. I have tried the 3D effect in Illustrator, but I can't get the right result that way. What would be the best way to do this?
I would really appreciate it if someone could write me some short step-by-step instructions for this.
Below is the sample file for Illustrator. It only has the main shapes and the general colors applied and nothing else.
CS6 version: http://www.mediafire.com/?skpgfsmy2hxqi6s
CS5 version: http://www.mediafire.com/?gxxix6el5wcnaad
My infinite thanks in advance for any help given.
~ ID Graphics.Start with your simple drop shadows, and then use a clipping mask. Group your letters, and make a copy of the group. Femove shadows from the copy andhange the copy to a black fill. Apply the mask like this: All the unwanted parts of the shadow will be hidden.
-
Stuck with query on dba_tab_partitions because of long .
Hi,
I'm trying to dynamically generate split partition sql but stuck with error ORA-00932: inconsistent datatypes: expected NUMBER got LONG.
Here is my code.
select 'alter table ' || table_owner || '.' || table_name || ' split partition P_MAX at ' || high_value
from (
select rownum rnum, t.* from (
select t.* from dba_tab_partitions t where t.table_owner = 'TEK' and t.table_name = 'TAB' order by t.partition_position desc
) t
where rnum between 2 and 5 and (num_rows != 0 or empty_blocks != 16383);Basically I'm trying to generate new partition with high_value = high_value + 3000 .
That long is really annoying .
My DB is 9.2.0.8 .
Regards.
GregNot sure if this is the best way, but I think it'll work:
create a dummy table that holds the data of dba_tab_partitions but using to_lob(high_value) as high_value.
then issue your select from this dummy table using to_number(high_value)
Hope this helps. -
Stuck with black screen with Apple and download bar approx 1 quarter done. Downloading Yosemite. It has completely stopped. I can't access anything. Please help
You should really read the manual.
"How do you restore from backup? "
Restore. When given the choice, choose to use backup.
"And how can I check to see if the pics and videos are on my computer somewhere first??"
They would only be where you put them. What program did you use to import them? Pics/vids taken with ipod are not part of the sync process at all. You should be importing them just as you would with any digital camera.
If you did not import them, then they are not on your computer. -
How to parse XML to Java object... please help really stuck
Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
id ID #REQUIRED
>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
the **XML** like:
<person id="a1">
<name>
<family> Yoshi </family>
<given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, YoHi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan
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