Java close PDF error

Just had this issue, too. With Java 7 you can do this:

try(PDDocument document = PDDocument.load(input)) {
  // do something  
} catch (IOException e) {
  e.printStackTrace();
}

Because PDDocument implements Closeable, the try block will automagically call its close() method at the end.

You're loading a PDDocument but not closing it. I suspect you need to do:

String textOfPdf;
PDDocument doc = PDDocument.load("doc");
try {
    textOfPdf = pdfs.getText(doc);
} finally {
    doc.close();
}