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Posted to users@pdfbox.apache.org by Ronald DERAMUS <ro...@gmail.com> on 2015/11/11 03:27:18 UTC
Trying to get rotate to work
Hi all,
I'm new to this list and to java. I was wondering if anyone has a good
working example of the rotate page feature? I haven't found a good example
and I am trying to rotate a whole pdf page and save it.. I have the
following code but it doesn't seem to work... I'm having a hard time
getting rid of the NullPointer error.
Here is my code:
//import java.awt.List;
import java.util.List;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
public class PdfRotator {
private static final String pdfFile = null;
public static void main(String[] args) throws IOException {
PDDocument document = PDDocument.load("PDFrotatorTEST.pdf");
//public static void main(String[] args) throws Exception {
List pages = (List) document.getDocumentCatalog().getAllPages();
for (int i = 0; i < pages.size(); i++) {
PDPage page = (PDPage) ((java.util.List) pages).get(i);// PDPage
page = (PDPage) pages.get(i);
if ((i + 1) % 2 == 0) {
page.setRotation(0);
}
}
File f = new File(pdfFile);// File f = new File(pdfFile);
String newFile = f.getParent() + File.separator + "out.pdf";
try {
document.save(newFile);
} catch (COSVisitorException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
document.close();
}
}
Errors:
Exception in thread "main" java.lang.NullPointerException
at java.io.File.<init>(Unknown Source)
at PdfRotator.main(PdfRotator.java:36)
Re: Trying to get rotate to work
Posted by Ronald DERAMUS <ro...@gmail.com>.
Thanks guys, I have a lot to learn and I thought it was something more
complicated than that..
sorry for the confusion..
Thanks!
On Tue, Nov 10, 2015 at 10:42 PM, Nasir Rasul <na...@gmail.com> wrote:
> Hi Ronald,
> Don't feel bad. We all started somewhere, some time ago. I've made plenty
> of mistakes myself.
>
> The objective of my answer was to illuminate the problem.
>
> Error told you about line and null pointer exception. On that line, you had
> >File f = new File(pdfFile);
>
> So, you would need to check pdfFile, if it has been assigned a value or
> not.
>
> That is how one would go on debugging these errors. Usually, you just need
> to look in the stack trace for clues.
>
> Hope it helps, and good luck.
>
> Feel free to use all channels available to you. There are plenty of kind
> strangers willing to help. Don't let comments dissuade you from learning.
>
> Cheers
> Nasir
>
> - Nasir
>
> On Tue, Nov 10, 2015 at 10:17 PM, Tilman Hausherr <TH...@t-online.de>
> wrote:
>
> > Am 11.11.2015 um 06:37 schrieb Nasir Rasul:
> >
> >> Hi Ronald,
> >>
> >> You are declaring
> >>
> >>> private static final String pdfFile = null;
> >>>
> >> Subsequently,
> >>
> >>> File f = new File(pdfFile);
> >>>
> >> In between you need to initialize pdfFile with a value. At this point,
> >> pdfFile is null. It has never been assigned a value
> >>
> >
> >
> > do this:
> >
> > private static final String pdfFile = "C:/your
> > directory/name-of-your-file.pdf";
> >
> > You are this guy, are you?
> >
> >
> https://stackoverflow.com/questions/33575548/pdfbox-image-rotation-from-90-to-0
> >
> > I wrote a comment there... this is not to put you down. You should
> really
> > learn java basics first before starting with something as complex as PDF.
> >
> > Tilman
> >
> >
> >
> >
> >> Cheers
> >> Nasir
> >>
> >>
> >> - Nasir
> >>
> >> On Tue, Nov 10, 2015 at 6:27 PM, Ronald DERAMUS <ronalddermus@gmail.com
> >
> >> wrote:
> >>
> >> Hi all,
> >>> I'm new to this list and to java. I was wondering if anyone has a good
> >>> working example of the rotate page feature? I haven't found a good
> >>> example
> >>> and I am trying to rotate a whole pdf page and save it.. I have the
> >>> following code but it doesn't seem to work... I'm having a hard time
> >>> getting rid of the NullPointer error.
> >>>
> >>> Here is my code:
> >>>
> >>> //import java.awt.List;
> >>> import java.util.List;
> >>> import java.io.File;
> >>> import java.io.FileInputStream;
> >>> import java.io.IOException;
> >>>
> >>> import org.apache.pdfbox.cos.COSDocument;
> >>> import org.apache.pdfbox.exceptions.COSVisitorException;
> >>> import org.apache.pdfbox.pdfparser.PDFParser;
> >>> import org.apache.pdfbox.pdmodel.PDDocument;
> >>> import org.apache.pdfbox.pdmodel.PDPage;
> >>>
> >>>
> >>> public class PdfRotator {
> >>>
> >>>
> >>> private static final String pdfFile = null;
> >>>
> >>> public static void main(String[] args) throws IOException {
> >>>
> >>> PDDocument document = PDDocument.load("PDFrotatorTEST.pdf");
> >>>
> >>>
> >>>
> >>> //public static void main(String[] args) throws Exception
> {
> >>>
> >>> List pages = (List) document.getDocumentCatalog().getAllPages();
> >>>
> >>> for (int i = 0; i < pages.size(); i++) {
> >>> PDPage page = (PDPage) ((java.util.List) pages).get(i);//
> >>> PDPage
> >>> page = (PDPage) pages.get(i);
> >>> if ((i + 1) % 2 == 0) {
> >>> page.setRotation(0);
> >>> }
> >>> }
> >>>
> >>> File f = new File(pdfFile);// File f = new File(pdfFile);
> >>> String newFile = f.getParent() + File.separator + "out.pdf";
> >>> try {
> >>> document.save(newFile);
> >>> } catch (COSVisitorException e) {
> >>> // TODO Auto-generated catch block
> >>> e.printStackTrace();
> >>> }
> >>> document.close();
> >>> }
> >>> }
> >>>
> >>> Errors:
> >>> Exception in thread "main" java.lang.NullPointerException
> >>> at java.io.File.<init>(Unknown Source)
> >>> at PdfRotator.main(PdfRotator.java:36)
> >>>
> >>>
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> > For additional commands, e-mail: users-help@pdfbox.apache.org
> >
> >
>
Re: Trying to get rotate to work
Posted by Nasir Rasul <na...@gmail.com>.
Hi Ronald,
Don't feel bad. We all started somewhere, some time ago. I've made plenty
of mistakes myself.
The objective of my answer was to illuminate the problem.
Error told you about line and null pointer exception. On that line, you had
>File f = new File(pdfFile);
So, you would need to check pdfFile, if it has been assigned a value or not.
That is how one would go on debugging these errors. Usually, you just need
to look in the stack trace for clues.
Hope it helps, and good luck.
Feel free to use all channels available to you. There are plenty of kind
strangers willing to help. Don't let comments dissuade you from learning.
Cheers
Nasir
- Nasir
On Tue, Nov 10, 2015 at 10:17 PM, Tilman Hausherr <TH...@t-online.de>
wrote:
> Am 11.11.2015 um 06:37 schrieb Nasir Rasul:
>
>> Hi Ronald,
>>
>> You are declaring
>>
>>> private static final String pdfFile = null;
>>>
>> Subsequently,
>>
>>> File f = new File(pdfFile);
>>>
>> In between you need to initialize pdfFile with a value. At this point,
>> pdfFile is null. It has never been assigned a value
>>
>
>
> do this:
>
> private static final String pdfFile = "C:/your
> directory/name-of-your-file.pdf";
>
> You are this guy, are you?
>
> https://stackoverflow.com/questions/33575548/pdfbox-image-rotation-from-90-to-0
>
> I wrote a comment there... this is not to put you down. You should really
> learn java basics first before starting with something as complex as PDF.
>
> Tilman
>
>
>
>
>> Cheers
>> Nasir
>>
>>
>> - Nasir
>>
>> On Tue, Nov 10, 2015 at 6:27 PM, Ronald DERAMUS <ro...@gmail.com>
>> wrote:
>>
>> Hi all,
>>> I'm new to this list and to java. I was wondering if anyone has a good
>>> working example of the rotate page feature? I haven't found a good
>>> example
>>> and I am trying to rotate a whole pdf page and save it.. I have the
>>> following code but it doesn't seem to work... I'm having a hard time
>>> getting rid of the NullPointer error.
>>>
>>> Here is my code:
>>>
>>> //import java.awt.List;
>>> import java.util.List;
>>> import java.io.File;
>>> import java.io.FileInputStream;
>>> import java.io.IOException;
>>>
>>> import org.apache.pdfbox.cos.COSDocument;
>>> import org.apache.pdfbox.exceptions.COSVisitorException;
>>> import org.apache.pdfbox.pdfparser.PDFParser;
>>> import org.apache.pdfbox.pdmodel.PDDocument;
>>> import org.apache.pdfbox.pdmodel.PDPage;
>>>
>>>
>>> public class PdfRotator {
>>>
>>>
>>> private static final String pdfFile = null;
>>>
>>> public static void main(String[] args) throws IOException {
>>>
>>> PDDocument document = PDDocument.load("PDFrotatorTEST.pdf");
>>>
>>>
>>>
>>> //public static void main(String[] args) throws Exception {
>>>
>>> List pages = (List) document.getDocumentCatalog().getAllPages();
>>>
>>> for (int i = 0; i < pages.size(); i++) {
>>> PDPage page = (PDPage) ((java.util.List) pages).get(i);//
>>> PDPage
>>> page = (PDPage) pages.get(i);
>>> if ((i + 1) % 2 == 0) {
>>> page.setRotation(0);
>>> }
>>> }
>>>
>>> File f = new File(pdfFile);// File f = new File(pdfFile);
>>> String newFile = f.getParent() + File.separator + "out.pdf";
>>> try {
>>> document.save(newFile);
>>> } catch (COSVisitorException e) {
>>> // TODO Auto-generated catch block
>>> e.printStackTrace();
>>> }
>>> document.close();
>>> }
>>> }
>>>
>>> Errors:
>>> Exception in thread "main" java.lang.NullPointerException
>>> at java.io.File.<init>(Unknown Source)
>>> at PdfRotator.main(PdfRotator.java:36)
>>>
>>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> For additional commands, e-mail: users-help@pdfbox.apache.org
>
>
Re: Trying to get rotate to work
Posted by Tilman Hausherr <TH...@t-online.de>.
Am 11.11.2015 um 06:37 schrieb Nasir Rasul:
> Hi Ronald,
>
> You are declaring
>> private static final String pdfFile = null;
> Subsequently,
>> File f = new File(pdfFile);
> In between you need to initialize pdfFile with a value. At this point,
> pdfFile is null. It has never been assigned a value
do this:
private static final String pdfFile = "C:/your directory/name-of-your-file.pdf";
You are this guy, are you?
https://stackoverflow.com/questions/33575548/pdfbox-image-rotation-from-90-to-0
I wrote a comment there... this is not to put you down. You should
really learn java basics first before starting with something as complex
as PDF.
Tilman
>
> Cheers
> Nasir
>
>
> - Nasir
>
> On Tue, Nov 10, 2015 at 6:27 PM, Ronald DERAMUS <ro...@gmail.com>
> wrote:
>
>> Hi all,
>> I'm new to this list and to java. I was wondering if anyone has a good
>> working example of the rotate page feature? I haven't found a good example
>> and I am trying to rotate a whole pdf page and save it.. I have the
>> following code but it doesn't seem to work... I'm having a hard time
>> getting rid of the NullPointer error.
>>
>> Here is my code:
>>
>> //import java.awt.List;
>> import java.util.List;
>> import java.io.File;
>> import java.io.FileInputStream;
>> import java.io.IOException;
>>
>> import org.apache.pdfbox.cos.COSDocument;
>> import org.apache.pdfbox.exceptions.COSVisitorException;
>> import org.apache.pdfbox.pdfparser.PDFParser;
>> import org.apache.pdfbox.pdmodel.PDDocument;
>> import org.apache.pdfbox.pdmodel.PDPage;
>>
>>
>> public class PdfRotator {
>>
>>
>> private static final String pdfFile = null;
>>
>> public static void main(String[] args) throws IOException {
>>
>> PDDocument document = PDDocument.load("PDFrotatorTEST.pdf");
>>
>>
>>
>> //public static void main(String[] args) throws Exception {
>>
>> List pages = (List) document.getDocumentCatalog().getAllPages();
>>
>> for (int i = 0; i < pages.size(); i++) {
>> PDPage page = (PDPage) ((java.util.List) pages).get(i);// PDPage
>> page = (PDPage) pages.get(i);
>> if ((i + 1) % 2 == 0) {
>> page.setRotation(0);
>> }
>> }
>>
>> File f = new File(pdfFile);// File f = new File(pdfFile);
>> String newFile = f.getParent() + File.separator + "out.pdf";
>> try {
>> document.save(newFile);
>> } catch (COSVisitorException e) {
>> // TODO Auto-generated catch block
>> e.printStackTrace();
>> }
>> document.close();
>> }
>> }
>>
>> Errors:
>> Exception in thread "main" java.lang.NullPointerException
>> at java.io.File.<init>(Unknown Source)
>> at PdfRotator.main(PdfRotator.java:36)
>>
---------------------------------------------------------------------
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Re: Trying to get rotate to work
Posted by Nasir Rasul <na...@gmail.com>.
Hi Ronald,
You are declaring
>private static final String pdfFile = null;
Subsequently,
>File f = new File(pdfFile);
In between you need to initialize pdfFile with a value. At this point,
pdfFile is null. It has never been assigned a value
Cheers
Nasir
- Nasir
On Tue, Nov 10, 2015 at 6:27 PM, Ronald DERAMUS <ro...@gmail.com>
wrote:
> Hi all,
> I'm new to this list and to java. I was wondering if anyone has a good
> working example of the rotate page feature? I haven't found a good example
> and I am trying to rotate a whole pdf page and save it.. I have the
> following code but it doesn't seem to work... I'm having a hard time
> getting rid of the NullPointer error.
>
> Here is my code:
>
> //import java.awt.List;
> import java.util.List;
> import java.io.File;
> import java.io.FileInputStream;
> import java.io.IOException;
>
> import org.apache.pdfbox.cos.COSDocument;
> import org.apache.pdfbox.exceptions.COSVisitorException;
> import org.apache.pdfbox.pdfparser.PDFParser;
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.pdmodel.PDPage;
>
>
> public class PdfRotator {
>
>
> private static final String pdfFile = null;
>
> public static void main(String[] args) throws IOException {
>
> PDDocument document = PDDocument.load("PDFrotatorTEST.pdf");
>
>
>
> //public static void main(String[] args) throws Exception {
>
> List pages = (List) document.getDocumentCatalog().getAllPages();
>
> for (int i = 0; i < pages.size(); i++) {
> PDPage page = (PDPage) ((java.util.List) pages).get(i);// PDPage
> page = (PDPage) pages.get(i);
> if ((i + 1) % 2 == 0) {
> page.setRotation(0);
> }
> }
>
> File f = new File(pdfFile);// File f = new File(pdfFile);
> String newFile = f.getParent() + File.separator + "out.pdf";
> try {
> document.save(newFile);
> } catch (COSVisitorException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> document.close();
> }
> }
>
> Errors:
> Exception in thread "main" java.lang.NullPointerException
> at java.io.File.<init>(Unknown Source)
> at PdfRotator.main(PdfRotator.java:36)
>