Ralf Hauser commented on PDFBOX-3604:

If you are so picky w.r.t. "declared" vs. "used", how about throwing an 
exception that says what the problem is?
So instead of

   "The TrueType font does not contain a ..."

something like

   "Font {0} first needs to be declared to the document by initially calling 
*Font.load(document, ...)"

> The TrueType font does not contain a 'cmap' table
> -------------------------------------------------
>                 Key: PDFBOX-3604
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3604
>             Project: PDFBox
>          Issue Type: Bug
>          Components: FontBox
>    Affects Versions: 2.0.3
>         Environment: debian stable, java8
>            Reporter: Ralf Hauser
> http://www.fonts2u.com/code2000.font is read in an inputstream and then made 
> to a PDFont.
> If I make this a static PDFont variable to only once read it from disk and 
> use it more than once, it only works with the first document I create and 
> thereafter I get the below error.
> Wouldn't it be nice to have this idempotent or at least with a reset() method?
> java.io.IOException: The TrueType font does not contain a 'cmap' table
>       at 
> org.apache.fontbox.ttf.TrueTypeFont.getUnicodeCmap(TrueTypeFont.java:477)
>       at 
> org.apache.fontbox.ttf.TrueTypeFont.getUnicodeCmap(TrueTypeFont.java:460)
>       at org.apache.fontbox.ttf.TTFSubsetter.<init>(TTFSubsetter.java:89)
>       at 
> org.apache.pdfbox.pdmodel.font.TrueTypeEmbedder.subset(TrueTypeEmbedder.java:302)
>       at 
> org.apache.pdfbox.pdmodel.font.PDType0Font.subset(PDType0Font.java:162)
>       at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1138)
>       at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1118)
>       at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1106)
> see also PDFBOX-3162

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