我正在使用pdfbox1.8.10并且我的文件夹有两个文档，而合并时我收到了以下警告，当我打开合并的PDF时，它包含一个PDF内容和其他PDF内容被忽略。 请让我知道你的建议
Nov 23, 2015 8:41:34 PM org.apache.pdfbox.pdfparser.BaseParser parseCOSDictionary
WARNING: Invalid dictionary, found: 'f' but expected: '/'
Nov 23, 2015 8:41:34 PM org.apache.pdfbox.pdfparser.BaseParser parseCOSDictionary
WARNING: Invalid dictionary, found: '?' but expected: '/'
Nov 23, 2015 8:41:34 PM org.apache.pdfbox.pdfparser.XrefTrailerResolver setStartxref
WARNING: Did not found XRef object at specified startxref position 0
Nov 23, 2015 8:41:34 PM org.apache.pdfbox.pdfparser.BaseParser parseCOSDictionary
WARNING: Invalid dictionary, found: 'f' but expected: '/'