iText InvalidPdfException重建失败：'＆gt;'不期望在文件指针

Question

我们尝试使用PdfSmartCopy将许多动态生成的pdf连接在一起

    Document document = new Document();
    PdfCopy copy = new PdfSmartCopy(document, outputStream);

    document.open();

    for (PdfReader reader : list) {
         int n = reader.getNumberOfPages();
        // page numbers start at 1
        for (int page = 1; page <= n; page++) {
            copy.addPage(copy.getImportedPage(reader, page));
        }

        copy.freeReader(reader);
        reader.close();
    }

    document.close();

有一段时间，我们不断收到此异常InvalidPdfException: Rebuild failed: '>' not expected at file pointer 65537; Original message: Invalid object number. at file pointer

或InvalidPdfException: Rebuild failed: Dictionary key 0 is not a name. at file pointer 65536

以前有没有遇到过这个？