https://bz.apache.org/bugzilla/show_bug.cgi?id=64274

            Bug ID: 64274
           Summary: ExtractorFactory#createExtractor shall throw
                    POIXMLException
           Product: POI
           Version: 4.1.x-dev
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: POI Overall
          Assignee: dev@poi.apache.org
          Reporter: zhong...@pku.org.cn
  Target Milestone: ---

When OOXML file is invalid,
org.apache.poi.ooxml.extractor.ExtractorFactory#createExtractor throws
IllegalArgumentException:

 public static POITextExtractor createExtractor(OPCPackage pkg) throws
IOException, OpenXML4JException, XmlException {
   ...
 if (core.size() != 1) {
      throw new IllegalArgumentException("Invalid OOXML Package received -
expected 1 core document, found " + core.size());
            }
 }

POI already implements POIXMLException for this type of problem. Other methods
all throw this exception:

org.apache.poi.ooxml.POIXMLDocumentPart.RelationPart#getPartFromOPCPackage

org.apache.poi.ooxml.POIXMLDocumentPart.RelationPart#getPartFromOPCPackage

org.apache.poi.xssf.eventusermodel.XSSFReader#XSSFReader

Please update the exception of createExtractor, so it is easier to catch this
type of problems.

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