To extract content from a pdf file, I have used below code segment working with
the iText library. However, for some pdf documents, it throws an exception
which is shown at below of the code. I donot understand why this exception is
sent for some document but for some other it is not thrown. Moreover and
urgently, how can I solve this problem?
private ArrayList<byte[]> contentOfPdf() {
PdfReader reader = null;
PdfDictionary dictionary = null;
PRIndirectReference reference = null;
PRStream contentStream = null;
ArrayList<byte []> byteStream = new ArrayList<byte []>();
try{
reader = new PdfReader(this.filename);
for(int currentPage = 0 ; currentPage <=
this.totalPageNumber ; currentPage ++ ) {
dictionary = reader.getPageN(currentPage);
reference = (PRIndirectReference)
dictionary.get(PdfName.CONTENTS);
/*line 166*/ contentStream = (PRStream)
PdfReader.getPdfObject(reference);
byteStream.add(
PdfReader.getStreamBytes(contentStream) );
}
} catch(Exception e){
e.printStackTrace();
} finally {
reader.close();
}
return byteStream;
}
**Exception :**
java.lang.ClassCastException: com.itextpdf.text.pdf.PdfArray cannot be
cast to com.itextpdf.text.pdf.PRStream
at pdfCrawler.retrieveContentOfPdf(CrawlerTask.java:166)
at pdfCrawler.call(CrawlerTask.java:55)
at pdfCrawler..call(CrawlerTask.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
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