org.dom4j.DocumentException: Error on line 1 of document : Content is not allowed in prolog. Nested-优快云博客

本文链接：https://blog.youkuaiyun.com/Semll_Java/article/details/101201918

本文探讨了在使用Dom4j解析XML文件时遇到的Content is not allowed in prolog错误，分析了可能的原因，包括文件编码错误或文件损坏，并提供了初步的排查步骤。

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报错：

org.dom4j.DocumentException: Error on line 1 of document : Content is not allowed in prolog. Nested exception: Content is not allowed in prolog.
   at org.dom4j.io.SAXReader.read(SAXReader.java:482)
   at org.dom4j.io.SAXReader.read(SAXReader.java:365)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:71)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:59)
   at com.primeton.dgs.extractor.server.adapter.mapping.impl.BuildTableauServiceImpl.buildMetadata(BuildTableauServiceImpl.java:78)
   at com.primeton.dgs.extractor.server.adapter.mapping.BuildMetadataBaseService.buildMetadatas(BuildMetadataBaseService.java:77)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.singleExtract(ExtractServiceImpl.java:263)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:199)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:144)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.extract(ExtractServiceImpl.java:72)
   at com.primeton.dgs.extractor.server.control.ExtractController.adapterControl(ExtractController.java:58)
   at com.primeton.dgs.extractor.server.control.ExtractRunnable.run(ExtractRunnable.java:35)
   at java.lang.Thread.run(Thread.java:745)
Nested exception:
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
   at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
   at org.dom4j.io.SAXReader.read(SAXReader.java:465)
   at org.dom4j.io.SAXReader.read(SAXReader.java:365)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:71)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:59)
   at com.primeton.dgs.extractor.server.adapter.mapping.impl.BuildTableauServiceImpl.buildMetadata(BuildTableauServiceImpl.java:78)
   at com.primeton.dgs.extractor.server.adapter.mapping.BuildMetadataBaseService.buildMetadatas(BuildMetadataBaseService.java:77)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.singleExtract(ExtractServiceImpl.java:263)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:199)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:144)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.extract(ExtractServiceImpl.java:72)
   at com.primeton.dgs.extractor.server.control.ExtractController.adapterControl(ExtractController.java:58)
   at com.primeton.dgs.extractor.server.control.ExtractRunnable.run(ExtractRunnable.java:35)
   at java.lang.Thread.run(Thread.java:745)
Nested exception: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
   at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
   at org.dom4j.io.SAXReader.read(SAXReader.java:465)
   at org.dom4j.io.SAXReader.read(SAXReader.java:365)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:71)
   at com.primeton.dgs.extractor.server.util.Dom4jReader.initDocument(Dom4jReader.java:59)
   at com.primeton.dgs.extractor.server.adapter.mapping.impl.BuildTableauServiceImpl.buildMetadata(BuildTableauServiceImpl.java:78)
   at com.primeton.dgs.extractor.server.adapter.mapping.BuildMetadataBaseService.buildMetadatas(BuildMetadataBaseService.java:77)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.singleExtract(ExtractServiceImpl.java:263)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:199)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:144)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.extract(ExtractServiceImpl.java:72)
   at com.primeton.dgs.extractor.server.control.ExtractController.adapterControl(ExtractController.java:58)
   at com.primeton.dgs.extractor.server.control.ExtractRunnable.run(ExtractRunnable.java:35)
   at java.lang.Thread.run(Thread.java:745)
2019-09-23 11:25:07,140 ERROR ExtractServiceImpl:328 -
java.lang.NullPointerException
   at com.primeton.dgs.extractor.server.util.Dom4jReader.selectNodes(Dom4jReader.java:151)
   at com.primeton.dgs.extractor.server.adapter.mapping.impl.BuildTableauServiceImpl.buildMetadata(BuildTableauServiceImpl.java:79)
   at com.primeton.dgs.extractor.server.adapter.mapping.BuildMetadataBaseService.buildMetadatas(BuildMetadataBaseService.java:77)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.singleExtract(ExtractServiceImpl.java:263)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:199)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.multiExtract(ExtractServiceImpl.java:144)
   at com.primeton.dgs.extractor.server.control.impl.ExtractServiceImpl.extract(ExtractServiceImpl.java:72)
   at com.primeton.dgs.extractor.server.control.ExtractController.adapterControl(ExtractController.java:58)
   at com.primeton.dgs.extractor.server.control.ExtractRunnable.run(ExtractRunnable.java:35)
   at java.lang.Thread.run(Thread.java:745)

解决方案：

（1）查看你的导入的文件是否能正常打开，是否有编码错误，如若导入的文件打不开就是文件有问题了。

（2）

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作者还在努力解决，如果有大神知道，还请指点一二，谢谢！