namedgraph commented on issue #1450:
URL: https://github.com/apache/jena/issues/1450#issuecomment-1188294089

   @afs I'm trying to narrow this down.
   
   It looks like it's caused by my `OntModelReadOnly` implementation. This 
gives the NPE:
   ```
   new org.apache.jena.rdfxml.xmloutput.impl.Basic().write(new 
OntModelReadOnly(ontModel)), System.out, null);
   ```
   while this succeeds:
   ```
   new org.apache.jena.rdfxml.xmloutput.impl.Basic().write(ontModel), 
System.out, null);
   ```
   
   Could it be because my subclass is denying access to the `*NsPrefix` methods?
   
https://github.com/AtomGraph/Processor/blob/master/src/main/java/com/atomgraph/processor/util/OntModelReadOnly.java#L1436
   I'll try allowing them.


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