Now it compiles but when I try to sign a pdf I get this error:

Exception in thread "main" java.lang.NullPointerException                       
                         
        at
com.itextpdf.text.pdf.security.PrivateKeySignature.<init>(PrivateKeySignature.java:76)
        
        at SignWithCAcert.sign(SignWithCAcert.java:51)                          
                         
        at SignWithCAcert.main(SignWithCAcert.java:68)        

>51-ExternalSignature pks = new PrivateKeySignature(......
>68-app.sign(SRC, DEST, chain, pk, DigestAlgorithms.SHA256, .........

The certificate has been issued to me by an Italian Regional CA and is
valid.
It works fine with older iText-5.0.6.jar and signing method
(PdfSignatureAppearance.WINCER_SIGNED) 
                         

Thanks.





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