Cflock and iText

Developers,
I'm using CFMX 7 with iText. I have a form in which users can
select multiple pdf documents via checkboxes. After selecting a
number of checkboxes, they can either immediately hit the Submit
button to merge (using iText) all selected documents, or from a
dropdown box, select an image to be applied to the top of each
document, and then hit Submit, which will merge the documents
first, then apply the image to each page of the merged documents.
(reference this post for additional information:
iText
Watermark position issue)
The merging and watermarks work great; however the problem
I'm having now is what appears to be file corruption. Every now and
again, when a user selects the documents and an image, the page
processes, but returns a previously merged document with a previous
image applied. Looking at merged file on the server confirms that
the file is corrupt and sometimes I am able to delete the file and
then future selections merge correctly.
So I figured I could apply cflock - as this must be a race
condition issue - to prevent the corruption. However, I don't think
I fully understand it as it does not appear to be working. I have
some documentation where you are supposed to name the locks the
same and other documentation states to name one readonly and the
other exclusive.
Attached is my code below. Can someone please look and give
advice as how to proceed? Also, I can include the code from
mergeOnly.cfm and mergeWatermark.cfm if necessary.
Thanks.

Also, if you are replacing an _existing_ file, you might
consider using a temporary file, to avoid locking the entire call.
Then at the end, replace the existing file with the temporary one,
and delete the temp file.
Here is a good link on locking file renames:
http://www.houseoffusion.com/groups/cf-talk/thread.cfm/threadid:49321#263456

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Hello.
Im not sure what do you want to do, but here is a more detailed code which u can see how to check or uncheck a radio button using itext:
try {
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("radiobutton.pdf"));
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catch(DocumentException de) {
System.err.println(de.getMessage());
catch(IOException ioe) {
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I had a look but seems like I have use command line to execute the process. You do.
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If you want to send output to two simultaneous output streams (one for the browser and the other to save the PDF in the server's filesystem), then the following may help:
final public class Tee extends OutputStream {
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    final private OutputStream second;
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     * @param     second          Second stream to write to
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        this.second = second;
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     * @throws     IOException
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        second.write(target);
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     * @see          OutputStream#flush()
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        second.flush();
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     * @throws     IOException
     * @see          OutputStream#close()
    final public void close()
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        try {
            first.close();
        catch (IOException e) {
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}- Saish

Create pdf using a .xdp file and iText

Hello experts,
my question is regarding the generation of a pdf file using a .xdp file and the iText API. I have an .xdp file of a designed form and I would like to generate a pdf using this file, the iText API and the context.
Is it possible? are there any tutorials or examples? any help is welcome!
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Alperen

Hi,
Please check the following links:
How to import an xdp-File to Web Dynpro Interactive Forms
https://wiki.sdn.sap.com/wiki/display/XI/CODE-CreateaPDFFileviatheiText+Library
Sample project how to use Itext (pdf) in webdynpro
Itext PDF Creation
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CFLock and Passing parameters

Hello there, I have two questions...
In numerous examples of site security, I've noticed the CFlock tag used. Hwoever, when looking at CF9 documentation, in a specific example of site security that includes user roles (using an application.cfc file) there is no mention of CFLocks. Are they necessary to authenticate users or not? I can't see why they would be. The variable being changed is the users status (authenticated or not) and since it is in the session scope, it is already unique, right? So why bother with CFLock?
Second, how can I redirect a person to the same page they where on after submitting a form? I have a news letter form present on all pages of the website, and I would like the person to return to teh same page they where on when they submitted the form.

@Mel.Husseini
So why bother with CFLock?
@Ian Skinner
In pre-mx days, i.e. ColdFusion 4.5, ColdFusion suffered from a bad memory leak with shared memory variables like session. One of the popular work arounds was to <cflock...> all reads and writes to these variables. That has long been unnecessary, but there is still tons of old code examples and old developers that continue to utilze this work around.
Those are issues that are resolved by the fact that Coldfusion is now a thread-safe Java application. However, there are other uses for cflock.
Here are some examples. A web shop application may store the shopping cart in session scope. A session lock would then be necessary, for example, to prevent the customer from adding an item while his order is proceeding to checkout. You need a named lock to ensure that one user completely uploads or writes to a file, before another can read it.
@Mel.Husseini
Second, how can I redirect a person to the same page they where on after submitting a form? I have a news letter form present on all pages of the website, and I would like the person to return to teh same page they where on when they submitted the form.
There are CGI variables and Coldfusion functions that give the value of the current page. Coldfusion also passes the current page as an argument in the onRequestStart event of Application.cfc. Put the value in a hidden field in the form. Then, on the action page, use cflocation to redirect to it.

How is cflock and cffinally guaranteed?

Consider this
<cflock ...>
   <cftry>
   <cfcatch>
      <cfexit method="exittemplate">
   </cfcatch>
   </cftry>
</cflock>
Will the </cflock>-related code execute despite the <cfexit> or maybe even <cfabort>?
Unfortunately, one cannot write
<cftry>
   <cflock ...>
<cfcatch>
   <cfexit method="exittemplate">
</cfcatch>
<cffinally>
   </cflock>
</cffinally>
</cftry>
Or will this do what I want, regardless of whatever and where the exception is thrown?
<cftry>
   <cflock ...>
   </cflock>
<cfcatch>
   <cfexit method="exittemplate">
</cfcatch>
</cftry>
Anyone to make this more clear to me?
Thank you
Martin

My instinct is that the first approach will work fine: CF needs to be clever enough to clear locks even when the closing CFLOCK tag is never encountered. This would be pretty easy for you to test, really.
Either the first or third approach will work: if all that's happening in the CFCATCH is the CFEXIT call, then you don't need to have that in the lock anyhow: there's nothing that needs locking.
If there was code in the CFCATCH that needed to be within the same lock as the rest of the code, then the first approach would be necessary.
Adam

IText and setExtraMargin

I've been going around and around on trying to get a properly
formatted flat pdf created with my data. I have to say that Adobe's
ability to actually format a multi-line field as it was presented
when it was editable is frustrating. CFMX8, pdfTK and iText all
have the same problem of aligning the data in a multi-line field to
the top when the pdf is flattened. activePDF is the only app i've
found that does the formatting correctly, but they have SO many
other issues with correctly populating a complex form that I'm back
to trying to make something like iText work correct.
I found this function for iText called setExtraMargin(); and
it works perfect with the values 0, 6 to jog the text down. Now my
problem is how to set this dynamicly based on if the the field is
multi-line or not.
I found this bit of code, but I'm not able to figure out how
to convert this to <cfscript>. I need to be able to loop over
something like this for each form key/value pair I'm inserting back
into the pdf template.
Any help would be great.
I'm currently testing on MX8 if it makes a difference. Altho
i will eventually trying to make this work on a cf4.5.1 server.
--Dennis--

> but need to chk each field for the FF_Multiline value
for that field
No. I think PdfFormField.FF_MULTILINE is a constant value
used to represent that a field
is multi-line.
Looks like you extract the field's setting into a variable
named "n" here:
PdfNumber n = (PdfNumber)merged.get(PdfName.FF);
The value is then compared to the constant
PdfFormField.FF_MULTILINE. If the values are equal it means the
field is multiline.
if (n != null && (n.intValue() &
PdfFormField.FF_MULTILINE) !=0)
af.setExtraMargin(0, 6);

Problem with application-variables - CFLOCK?

Hi,
i have a problem with my application. It is a multi-user
application with 100 parallel-users and CFMX 7.
The problem wich occures is with application variables. These
are mainly structs wich get filled onApplicationStart(). The
problem is, that the variables suddenly disappear, they are empty.
I have read about CFLock and found out, that it is necesseary
to use cflock. And i found out, that onApplicationStart does
correct locking automatically. That is where i do not understand
the problem. The variables get intialized correctly and in further
they only get read-access. Why can they be corrupted?
My other question about that is, wheather i need cflock for
all Read-Access to Application and Session-Variables, even if there
happens no writing to the variables?
Best Regards,
Andreas

> ?The element of position 2, of dimension 2, of an array
object used as part of
> an expression, cannot be found.?
> The array is in this case the struct.
Well, OK, that could be a problem. Arrays are not structs:
they are two
different things, are not interchangeable, and have
completely different
sets of functions to utilise them. You cannot treat a struct
as an array.
If CF is claiming your "struct" is an array, then it actually
*is* an
array, not a struct.
What's the line of code which is generating that error?
I suppose one could get this error if you have an array of
structs thus:
myArray
.key1
myArray.key2
(etc)
and you're trying to reference it with a numeric key rather
than by key
name, eg:
myArray
[n]
When n is an integer value, rather than a string (which
corresponds to the
name of the key).
> > Have you trapped the error, done a <cfdump>
of the application scope and
> > checked to see if it's the whole lot going awry, or
just some values?
> I have not used cfdump for it, because the server had to
be immediately
> restarted for our customers. But i think, that it is
not completely empty,
> because the index runs to pos2 of dimenstion2.
So does this not happen in your dev / testing environment?
> Will
> onApplicationStart() be called before? Or only if
onRequestStart() returns true?
I would ***-u-me that the application one would be called
before the
request one. It's pretty easy for you to test this though, I
should think?
(Sorry: for reasons beyond the scope of this conversation,
we're still
forced to use Application.cfm in our software, so I've only a
passing
knowledge of how Application.cfc works).
> Here is the code from onRequestStart()
> <cffunction name="onRequestStart"
returntype="boolean">
> <cfargument name="Requestedpage" required="yes" />
> <cfscript>
> var lFile = "/cargorent/Login.cfm";
> var iPosn = ListFindNoCase( lFile,
Arguments.Requestedpage );
> if( iPosn gt 0 )
> return true;
>
> if( NOT IsDefined( "session.user.Loginname" ) or
session.user.Loginname eq
> "" )
> {
> WriteOutput( "<p><p> The current user is no
longer valid, please log in
> again.</p></p>" & chr(10) & chr(13)
> WriteOutput( "<script
language=""javascript"">parent.location = ""
http://"
> & CGI.HTTP_HOST &
"/Login/Login.cfm"";</script>" );
> return false;
> }
>
> return true;
> </cfscript>
> </cffunction>
One thing I will say here is that I really think you should
be separating
your processing from your display. A function should do
processing. it
should pass that processing back to a CFM template which
should handle
whatever needs to be displayed on the browser. Although
that's nowt to do
with your current issue.
Adam

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I had a client that had hundreds of session variables
scattered in hundreds of CF pages. There was very little CFLOCKing,
and consequently the apps were quite unstable in a loaded
environment.
What I finally did was to copy the session scope variables to
ses.request scope variables of the same name, then did a global
replace of session. with ses.request. In OnRequestEnd.cfm, and
immediately before all CFLOCATIONs, I copied ths ses.request scope
back to session scope (locked, of course). There was no measurable
performance hit, and the apps were rock solid.
Perhaps you could copy your client variables to session
scope; then back again in OnRequestEnd.cfm

How do I save and restore Session?

Is it possible to have a user leave the site for a period of
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database and writing them all to the db on each page load with the
last visited page, and then resetting from that on their next
visit, but is there an easier way through Cold Fusion that I'm not
aware of? Any assistance is apprecaited.

I had a client that had hundreds of session variables
scattered in hundreds of CF pages. There was very little CFLOCKing,
and consequently the apps were quite unstable in a loaded
environment.
What I finally did was to copy the session scope variables to
ses.request scope variables of the same name, then did a global
replace of session. with ses.request. In OnRequestEnd.cfm, and
immediately before all CFLOCATIONs, I copied ths ses.request scope
back to session scope (locked, of course). There was no measurable
performance hit, and the apps were rock solid.
Perhaps you could copy your client variables to session
scope; then back again in OnRequestEnd.cfm

What are correct steps of integrating and using jasper report with ADF 11g?

Hi,
I am using JDev 11.1.1.2.0 with ADF 11g.
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Hi,
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import java.awt.*;
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                    g.drawString(""+i*30,10,i*sy+sy+2);
               g.setColor(Color.black);
               for (int i=0; i < xt.length-1; i++)     {
                    if (xt[ i ] == 1)
                         g.drawLine(i*30+sx,yv[ i ]+sy,(i+1)*30+sx,yv[ i+1 ]+sy);
          public void update(Graphics g){
               paint(g);
     public class MyPopupMenu extends JPopupMenu {
          JMenuItem menuItem, menuItem2;
          public MyPopupMenu() {
                    menuItem = new JMenuItem("Print chart");
                    menuItem.addActionListener(new ActionListener() {
                      public void actionPerformed(ActionEvent e) {
                        System.out.println("Printing...");
                    menuItem2 = new JMenuItem("Convert to pdf");
                    menuItem2.addActionListener(new ActionListener() {
                      public void actionPerformed(ActionEvent e) {
                        System.out.println("Converting...");
                    add(menuItem);
                    add(menuItem2);
     public static void main(String[] args ) {
          new MyChart();
}

I wrote a document a while back describing how to use JFreeChart and iText to generate charts in PDF format. You can download it from the JFreeChart project page on SourceForge:
http://sourceforge.net/projects/jfreechart
Look in the 'Files' section under 'Documentation' for a file called 'jfreechart2pdf-v2.pdf'. It should give you some pointers.
Regards,
Dave Gilbert
JFreeChart Project Leader

Cflock and iText

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