Hi Everybody,
in the moment I am writing an application for a Customer. One functionality is
the option to generate a pdf-file. To do this, I wrote a Controller which
extends the PdfPageEventHelper. the Controller has a print(DataObject toPrint)
method. These PrintMethod prints the Data's given as the parameter "toPrint",
but first of all the toPrint Object is stored in a global variable. Everything
worked fine until I overrids the onPageEnd Method, to generate a Header. The
problem is that the global Variable holding the data to be printed is null,
althought is was set by the call of the print method. Unfortunately, I am not
allowed to send the complete code, but I added a bit pseudoCode to ilustrate
the Problem a bit Better:
public class PdfController extends PdfPageEventHelper
{
private DataObject data;
public void print(DataObject toPrint)
{
this.data = toPrint;
Document document = new Document(PageSize.A4, 50, 50, 100, 70);
PdfWriter writer = PdfWriter.getInstance(document, new
FileOutputStream("HelloWorld.pdf"));
document.open();
//do some PDF-Generation Stuff, depending on which kind of data is in
"data"
document.newPage();
//do some PDF-Generation Stuff, depending on which kind of data is in
"data"
document.close();
}
public void onEndPage(PdfWriter writer, Document document)
{
//setup the header
PdfPTable table = new PdfPTable(1);
table.addCell((String)data.getFirstHeaderElement());
head.addCell(table);
//do some more stuff..
}
}
In the Line table.addCell((String)data.getFirstHeaderElement()); in the
onEndPageMethod I get an NullPointerException, during debugging I saw, that
"data" is set directly before the call of "document.newPage();" but in the
"onPageEnd"-Method it is null. Can you tell me what the Problem is, and how to
solve it? Thanks a million
armerIrrer
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