org.dom4j.DocumentException: Error on line 1 of document : Content is not allowed in prolog. Nested
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）
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
作者还在努力解决，如果有大神知道，还请指点一二，谢谢！
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