Logging is helpful for understanding why POI can't read some file or developing POI itself.Important errors are thrown as exceptions, which means you probably don't need logging.These will load a Core POI class, an OOXML class and a Scratchpad class, and report where they all came from. POIFSFile System.Class Loader(); URL res = Resource( "org/apache/poi/poifs/filesystem/POIFSFile System.class"); String path = Path(); println("POI Core came from " path); classloader = org.
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Every so often, you may try to use part of the file format which isn't included in the minimal poi-ooxml-schemas jar.
In this case, you should switch to the full ooxml-schemas-1.3
You almost certainly have an older version of Apache POI on your classpath.
Quite a few runtimes and other packages will ship older version of Apache POI, so this is an easy problem to hit without your realising.
HSLFSlide Show.Class Loader(); res = Resource("org/apache/poi/hslf/usermodel/HSLFSlide Show.class"); path = Path(); println("POI Scratchpad came from " path); is only about 4mb.
This latter jar file only contains the typically used parts though.
Excel stores dates as numbers therefore the only way to determine if a cell is actually stored as a date is to look at the formatting.
There is a helper method in HSSFDate Util that checks for this.
The SS eventmodel package is an API for reading Excel files without loading the whole spreadsheet into memory.