NPE at 
org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.calculateFontSize(PDAppearance.java:551)
-------------------------------------------------------------------------------------------------------

                 Key: PDFBOX-1234
                 URL: https://issues.apache.org/jira/browse/PDFBOX-1234
             Project: PDFBox
          Issue Type: Bug
            Reporter: Christer Palm


Using SVN trunk revision 1291094 (2012-02-18)
Getting the following stack trace when trying to call PDField.setValue() on a 
AcroForm field in the attached document;

java.lang.NullPointerException
        at 
org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.calculateFontSize(PDAppearance.java:551)
        at 
org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.insertGeneratedAppearance(PDAppearance.java:371)
        at 
org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.setAppearanceValue(PDAppearance.java:281)
        at 
org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.setValue(PDVariableText.java:131)

Reason seems to be that PDApperance.getFontAndUpdateResources() returns null, 
in turn because the font dictionary for the DA of the field ("/Cour 11 Tf 0 g") 
is not present in the document.

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