On Wed, 3 Feb 2021, Bryan Coleman wrote:
java.io.IOException: Your InputStream was neither an OLE2 stream, nor an OOXML stream or you haven't provide the poi-ooxml*.jar in the classpath/modulepath - FileMagic: OLE2, having providers: [org.apache.poi.xssf.usermodel.XSSFWorkbookFactory@40086342]
That's very odd - you have the main POI jar there (need it for WorkbookFactory), but somehow have lost the reference to the HSSF classes which also live there...
Note: It works when running in my IDE; however, when it runs from a (mega) jar (built by ant), we get the exception above.
Ah, I suspect something is clobbering some files when it merges stuff into a mega jar. My guess is it's the /META-INF/services files, and your mega jar is taking just one rather than merging as it needs to
Can you post details of how you're building the mega jar, and/or look up how to get the tool/task you're using to merge not overwrite ServiceLoader / Java Service Provider Interface services files?
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