Java 8 and Apache POI 4.x here. I've found evidence that you can only get 64K different data formats via dataFormat.getFormat(...). But does that mean you can call dataFormat.getFormat(...)any number of times, so long as your app is using 64K (or less) different data formats? Or does it mean you can only apply formatting (and thus call dataFormat.getFormat(...) 64K times before you start getting errors?
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Apache POI DataFormat limitations vs method invocations
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