Why this code gives me this error message---> an Exception in thread "main"
java.lang.ClassCastException: com.itextpdf.text.pdf.PRIndirectReference cannot
be cast to com.itextpdf.text.pdf.PdfDictionary.
//----------------------------------------------my codes
/*
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.parser.PdfContentReaderTool;
import java.awt.Color;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Section;
import com.itextpdf.text.Anchor;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfImage;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import java.io.PrintWriter;
*/
import com.itextpdf.text.pdf.PdfStamper;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.*;
import java.util.Iterator;
import com.itextpdf.text.pdf.PdfLayer;
import java.util.Map;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.Document;
import com.itextpdf.text.pdf.PdfDictionary;
import java.lang.String;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfLayer;
import com.itextpdf.text.pdf.parser.PdfContentReaderTool;
import java.io.FileNotFoundException;
import java.util.Set;
import java.util.HashMap;
import java.util.HashSet;
import com.itextpdf.text.pdf.PdfWriter;
import java.util.Dictionary;
import java.util.Iterator;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import java.util.Collection;
import java.util.Hashtable;
public class info {
public static void main(String[] args) throws FileNotFoundException,
DocumentException,
IOException {
PdfReader reader = new PdfReader("personalize.pdf"); //
personalize.pdf is a pdf file with 4 layers
if (isWatermarked(reader))
System.out.println("is marked");
else
System.out.println("is not marked");
reader.close();
}
public static boolean isWatermarked(PdfReader reader) throws
DocumentException, IOException{
PdfStamper stamper = new PdfStamper (reader, new
FileOutputStream("myTest2.pdf"));
Map<String, PdfLayer> layers =(Map) stamper.getPdfLayers();
boolean wm=false;
if (!layers.isEmpty()) {
Set<String> keys = layers.keySet();
for (String key : keys) {
if(key.toString().equalsIgnoreCase("layout"))
wm=true;
System.out.println("Layer name: " + key);
//PdfLayer layer = layers.get(key);
// do stuff with layer...
}
}
stamper.close();
return wm;
}
}// end of class
------------------------------------------------------------------------------
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