使用 PDF Clown 的 PDF 写入错误

Question

I have a PDF file which i am reading using PDF Clown and then adding some annotations to it. After that i am trying to serialize the file to disk using Save method of org.pdfclown.files.File. In doing so i am getting following error

An exception happened while running the sample: org.pdfclown.util.parsers.PostScriptParseException: Unknown type beginning: 'False' at org.pdfclown.tokens.BaseParser.ParsePdfObject() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\tokens\\BaseParser.cs:line 149 at org.pdfclown.tokens.FileParser.ParsePdfObject() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\tokens\\FileParser.cs:line 150 at org.pdfclown.tokens.FileParser.ParsePdfObject(XRefEntry xrefEntry) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\tokens\\FileParser.cs:line 221 at org.pdfclown.objects.PdfIndirectObject.get_DataObject() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\objects\\PdfIndirectObject.cs:line 275 at org.pdfclown.objects.PdfIndirectObject.WriteTo(IOutputStream stream, File context) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\objects\\PdfIndirectObject.cs:line 248 at org.pdfclown.tokens.PlainWriter.WriteStandard() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\tokens\\PlainWriter.cs:line 205 at org.pdfclown.tokens.Writer.Write(SerializationModeEnum mode) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\tokens\\Writer.cs:line 132 at org.pdfclown.files.File.Save(IOutputStream stream, SerializationModeEnum mode) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\files\\File.cs:line 315 at org.pdfclown.files.File.Save(String path, SerializationModeEnum mode) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.lib\\src\\org\\pdfclown\\files\\File.cs:line 272 at org.pdfclown.samples.cli.HelloWorldSample.UzairTestFunc() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.samples.cli\\src\\org\\pdfclown\\samples\\cli\\HelloWorldSample.cs:line 40 at org.pdfclown.samples.cli.HelloWorldSample.Run() in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.samples.cli\\src\\org\\pdfclo wn\\samples\\cli\\HelloWorldSample.cs:line 20 at org.pdfclown.samples.cli.SampleLoader.Run(String inputPath, String outputPath) in d:\\eProof\\testProjects\\pdf_clown_svn\\dotNET\\pdfclown.samples.cli\\src\\org\\pdfclown\\samples\\cli\\SampleLoader.cs:line 123

Now i cant share the PDF here, but i see that it is not able to handle the following object in the PDF
...
96 0 obj
False
endobj
...

Any ideas how to resolve this in PDF Clown?

Answer 1

96 0 obj False endobj

This object is invalid, boolean values are all lowercase:

7.3.2 Boolean objects

Boolean objects represent the logical values of true and false. They appear in PDF files using the keywords true and false .

(both ISO 32000-1 and ISO 32000-2)

To repair your PDF, therefore, please replace False by false .