Code:

File f = /* ... */
try (POITextExtractor extractor = ExtractorFactory.createExtractor(file);) {
  	return extractor.getText();
}

Which can result in:

Caused by: org.apache.poi.openxml4j.exceptions.OpenXML4JRuntimeException: Fail to save: an error occurs while saving the package : null
	at org.apache.poi.openxml4j.opc.ZipPackage.saveImpl(ZipPackage.java:500)
	at org.apache.poi.openxml4j.opc.OPCPackage.save(OPCPackage.java:1417)
	at org.apache.poi.openxml4j.opc.OPCPackage.save(OPCPackage.java:1404)
	at org.apache.poi.openxml4j.opc.ZipPackage.closeImpl(ZipPackage.java:349)
	at org.apache.poi.openxml4j.opc.OPCPackage.close(OPCPackage.java:420)
	at org.apache.poi.POIXMLTextExtractor.close(POIXMLTextExtractor.java:87)
	at com.gaggle.message.index.poi.PoiIndexer$1.call(PoiIndexer.java:94)
	at com.gaggle.message.index.poi.PoiIndexer$1.call(PoiIndexer.java:1)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.apache.poi.openxml4j.opc.internal.marshallers.ZipPackagePropertiesMarshaller.marshall(ZipPackagePropertiesMarshaller.java:46)
	at org.apache.poi.openxml4j.opc.ZipPackage.saveImpl(ZipPackage.java:444)



The file being processed was a word document and extractor.getText() DID return data.  Unfortunately, due to privacy concerns with a client I can't release the actual document.

Thanks.