newbie question

[Michel de Lange]

Dear experts,

I am having a few difficulties starting with pdfbox. The program does 
not seem to find anything in my pdf files. I get this output:

Extract content pdf document leng ----> 0

Here is my code:

public static void main(String[] args){

    PDDocument doc = new PDDocument();
    try {
        doc.load(new File("Shaffer.pdf"));
        String docText=null;
         try {
           PDFTextStripper stripper=new PDFTextStripper();
           docText=stripper.getText(doc);
            System.out.println("Extract content pdf document length -> 
" + docText.length());
         }
         finally {
             if (docText == null) {
             logger.info("****************   PDF content is null 
*********************");
           }
         }

        doc.close();

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

The program finds the file, and it is definitely a proper pfd with contents. 
What am I doing wrong?

Many thanks,



Michel