解决：PDFBox报的java.io.IOException: Missing root object specification in trailer

àì夳堔傛蜴生んèń 2024-03-27 17:11 81阅读 0赞

#### 文章目录 ####

*  问题描述
 *  原因分析
 *  解决方案

## 问题描述 ##

使用pdfbox类库操作pdf文件时，遇到下面的报错信息：  
java.io.IOException: Missing root object specification in trailer

PDFBox参考：  
[https://pdfbox.apache.org/][https_pdfbox.apache.org]  
Apache PDFBox 库是一个开源的用于处理 PDF 文档的 Java 工具。

--------------------

## 原因分析 ##

目前看下来有两种原因：

1.  pdf文件格式有损坏，无法读取
2.  使用的pdfbox版本有相关漏洞

--------------------

## 解决方案 ##

针对上面的 原因一，检查pdf文件格式，再操作。

针对上面的 原因二，**可以通过升级pdfbox版本来解决**：

Apache PDFBox 2.0.6 发布了，这个版本是基于 2.0.5 版本的增量式 bug 修复版本，包含了几个修复和小改进，在下面的release notes中就可以看到，修复了该问题：  
[Apache PDFBox 2.0.6 Release Notes][]

内容如下：

Sub-task
    [PDFBOX-3302] - Explicit support for certification signatures
    Bug
    [PDFBOX-3313] - Java 9 InaccessibleObjectException
    [PDFBOX-3318] - IllegalArgumentException in PDPageTree constructor: root cannot be null
    [PDFBOX-3347] - COSName parsing doesn't handle ISO-8859-1 encoded bytes
    [PDFBOX-3519] - COSName is not ascii
    [PDFBOX-3545] - COSParser.parseXref failing if startXrefOffset over pdf size
    [PDFBOX-3687] - PDFBox doesn't respect different setting of /DA at PDAnnotationWidget level to /DA at PDField level
    [PDFBOX-3717] - java.io.IOException: Missing root object specification in trailer
    [PDFBOX-3723] - FDFField.getValue() doesn't return the values in line with the Javadoc.
    [PDFBOX-3724] - Wrong size in rendering of some artifacts
    [PDFBOX-3726] - NPE when setting the field value in an AcroForm and the NormalAppearance entry exists but is COSNull
    [PDFBOX-3727] - "premature EOF, image will be incomplete"
    [PDFBOX-3728] - org.apache.pdfbox.cos.COSDictionary cannot be cast to org.apache.pdfbox.cos.COSStream
    [PDFBOX-3731] - IOException: Found Token[kind=NAME, text=bind] but expected ND at offset 91
    [PDFBOX-3732] - IllegalArgumentException when refreshing an appearance and no font resources are defined
    [PDFBOX-3733] - image added to pdf by tool AddImageToPDF is turn-overed
    [PDFBOX-3738] - Signature not visible on Acrobat
    [PDFBOX-3739] - ImageWriterIterator.next() and ImageReaderIterator.next() can return null
    [PDFBOX-3740] - Standard 14 and Encoding
    [PDFBOX-3741] - usage of default colorspace not checked by preflight
    [PDFBOX-3742] - Unknown dir object c='>' cInt=62 peek='>' peekInt=62
    [PDFBOX-3743] - Running GC between signing and saving document closes stream
    [PDFBOX-3745] - Wrong character width
    [PDFBOX-3747] - CmapSubtable#getCharCodes provides values in random order
    [PDFBOX-3748] - java.lang.UnsupportedOperationException: Kerning table version 0 format 2 not yet supported.
    [PDFBOX-3750] - java.util.zip.DataFormatException when parsing a PDF
    [PDFBOX-3751] - Flattening a pdf with refreshAppearances set to true causes a NullPointerException
    [PDFBOX-3752] - PDVariableText text color changes to be the same as the background color after flattening
    [PDFBOX-3753] - setting a RadioButton with export values does not update the appearance
    [PDFBOX-3754] - Skip << >> in type1 font parser
    [PDFBOX-3755] - ClassCastException in PDColor constructor: org.apache.pdfbox.cos.COSNull cannot be cast to org.apache.pdfbox.cos.COSNumber
    [PDFBOX-3757] - TTFSubsetter scrambles PostScript names and unicode codepoints when subset contains diaeresis
    [PDFBOX-3761] - Exception in thread "main" java.lang.NullPointerException
    [PDFBOX-3769] - Cannot read JBIG2 image when JBIG2-Image-Decoder is in path
    [PDFBOX-3775] - Merge documents fails due to IllegalArgumentException
    [PDFBOX-3781] - Existing AcroForm default resources is overwritten by signing code
    [PDFBOX-3783] - java.io.IOException: Expected root dictionary, but got this: COSNull{}
    [PDFBOX-3784] - Inline image incorrectly parsed
    [PDFBOX-3788] - java.lang.RuntimeException: java.io.IOException: Catalog cannot be found
    [PDFBOX-3789] - Some text missing in rendering
    [PDFBOX-3791] - Long rendering time
    [PDFBOX-3837] - PDFBox does not maintain the font appearence of a field if it appears severraly in a PDF Form
    Improvement
    [PDFBOX-2684] - Javadoc for COSBase.setNeedToBeUpdate
    [PDFBOX-3614] - Directly use the BouncyCastleProvider rather than installing it
    [PDFBOX-3716] - Read images from byte array
    [PDFBOX-3722] - make font cache error message less scary
    [PDFBOX-3730] - Encapsulate outputStream into BufferedOutputStream in PDDocument.save()
    [PDFBOX-3763] - Optimize SampledImageReader.getStencilImage()
    [PDFBOX-3768] - Optimize SampledImageReader.from1Bit()
    [PDFBOX-3770] - provide set of page indexes that have page label ranges
    [PDFBOX-3772] - Add COSBoolean(false) as option in PDDocumentCatalog's getOpenAction
    [PDFBOX-3779] - Add dpi and border parameter to PrintPDF command line utility

[https_pdfbox.apache.org]: https://pdfbox.apache.org/
[Apache PDFBox 2.0.6 Release Notes]: https://issues.apache.org/jira/secure/ReleaseNote.jspa?version=12339779&styleName=&projectId=12310760&Create=Create&atl_token=A5KQ-2QAV-T4JA-FDED_6961b36d0f931200416aeeb3c0dfeffc64b28c4e_lout