JBig2 support when using maven shade uber jar

[Peter Pinnau - SYSTEM CONCEPT GmbH <pi...@systemconcept.de>]

I use maven shade plugin to put all project dependencies in an uber jar. 
I managed to include pdfbox jbig2 classes via a filter include 
configuration. I inspected the jar file and it includes the 
org.apache.pdfbox.jbig2 package with classes und sub-packages.

When a jbig2 encoded PDF should be rendered I get:

org.apache.pdfbox.contentstream.PDFStreamEngine operatorException Cannot 
read JBIG2 image: jbig2-imageio is not installed

It works fine from my IDE where all jars are included seperatly.

How pdfbox determines if jbig2 support is present? What can be a 
solution to get jbig2 rendering working with an uber jar?


versions:

pdfbox 2.0.16

jbig2-imageio 3.0.2


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