Hi,
Versions used:
iText: 1.4.2
java: 1.5.0_14
To sign files, I'm basically using this snippet:
reader = new PdfReader(new
RandomAccessFileOrArray(file.getInputFile().getPath()), null);
PdfStamper stp = PdfStamper.createSignature(reader, new
FileOutputStream(file.getOutputFile()), '\0', this.tempFile, true);
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(null, this.getToken().getCertificateChain(), null,
PdfSignatureAppearance.WINCER_SIGNED);
sap.setExternalDigest(new byte[128], new byte[20], "RSA");
if (file.getSettings().needsCertification()) {
sap.setCertified(true);
}
but am experiencing problems with it every now and then. The signing
is done in a batch process, processing thousands of documents a day,
but every now and then I get one of the folowing 2 exceptions:
"Append mode requires a document without errors even if recovery was possible.":
Oct 6 13:39:14 app02 2008-10-06 13:39:14,640 Finalizer-1 ERROR
(PDFFileSigner:102) - 7810588_WEBPOST_93931544_36512821_(zzz document
owner) Problem while signing QueuedFile [in:
'/var/um/archive/236/200810/xyz.pdf', out:
'/usr/local/um/server/temp/archive/236/200810/xyz.pdf', settings:
(timestamp: true, certify: false,
alias: default, reason: 'Approved', token: JDBCTOKEN)]: Append mode
requires a document without errors even if recovery was possible.
Oct 6 13:39:14 app02 com.lowagie.text.DocumentException: Append mode
requires a document without errors even if recovery was possible.
Oct 6 13:39:14 app02 at
com.lowagie.text.pdf.PdfStamperImp.<init>(Unknown Source)
Oct 6 13:39:14 app02 at
com.lowagie.text.pdf.PdfStamper.<init>(Unknown Source)
Oct 6 13:39:14 app02 at
com.lowagie.text.pdf.PdfStamper.createSignature(Unknown Source)
or
"Invalid object number. at file pointer 2931"
Oct 6 13:43:32 app02 2008-10-06 13:43:32,193 Finalizer-2 ERROR
(PDFFileSigner:102) - 7812133_WEBPOST_93934810_36515796_(zzz document
owner)
Problem while signing QueuedFile [in:
'/var/um/archive/236/200810/abc.pdf', out:
'/usr/local/um/server/temp/archive/236/200810/abc.pdf', settings:
(timestamp: true, certify: false,
alias: default, reason: 'Approved', token: JDBCTOKEN)]: Invalid object
number. at file pointer 2931 Oct 6 13:43:32 app02 Oct 6 13:43:32
app02 2008-10-06 13:43:32,194 Finalizer-2 ERROR (FinalizerAction:77) -
7812133_WEBPOST_93934810_36515796_(Lampiris document owner)
signItem()
Oct 6 13:43:32 app02 java.lang.StringIndexOutOfBoundsException:
String index out of range: -1
Oct 6 13:43:32 app02 at java.lang.String.substring(String.java:1768)
Oct 6 13:43:32 app02 at java.lang.String.substring(String.java:1735)
Oct 6 13:43:32 app02 at
org.apache.log4j.net.SyslogAppender.append(SyslogAppender.java:254)
Oct 6 13:43:32 app02 at
org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)
Oct 6 13:43:32 app02 at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57)
Oct 6 13:43:32 app02 at
org.apache.log4j.Category.callAppenders(Category.java:187)
Oct 6 13:43:32 app02 at
org.apache.log4j.Category.forcedLog(Category.java:372)
Oct 6 13:43:32 app02 at org.apache.log4j.Category.log(Category.java:864)
I copied the PDF files from the system and tried signing them again,
and I get no errors anymore. Have any of you seen these errors before
and know where I should be looking at? Is there a tool i can use to
inspect the well-formedness of the PDF files?
Sincerely,
Gerrit
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