Casting error needs to be more informative

[matentzn]

This is unfortunately impossible to debug other than with binary search (deleting portions of the ontology until it works..)

uk.ac.manchester.cs.owl.owlapi.OWLAnonymousIndividualImpl cannot be cast to org.semanticweb.owlapi.model.OWLLiteral
java.lang.ClassCastException: uk.ac.manchester.cs.owl.owlapi.OWLAnonymousIndividualImpl cannot be cast to org.semanticweb.owlapi.model.OWLLiteral
	at org.geneontology.obographs.owlapi.FromOwl.generateGraph(FromOwl.java:477)
	at org.geneontology.obographs.owlapi.FromOwl.generateGraphDocument(FromOwl.java:110)
	at org.obolibrary.robot.IOHelper.saveOntologyFile(IOHelper.java:1214)
	at org.obolibrary.robot.IOHelper.saveOntology(IOHelper.java:638)
	at org.obolibrary.robot.CommandLineHelper.maybeSaveOutput(CommandLineHelper.java:663)
	at org.obolibrary.robot.ConvertCommand.execute(ConvertCommand.java:141)
	at org.obolibrary.robot.CommandManager.executeCommand(CommandManager.java:248)
	at org.obolibrary.robot.CommandManager.execute(CommandManager.java:192)
	at org.obolibrary.robot.CommandManager.main(CommandManager.java:139)
	at org.obolibrary.robot.CommandLineInterface.main(CommandLineInterface.java:56)

[matentzn]

I cant see anything wrong with the code.. The only place I can think of being a problem is:

String val = v instanceof IRI ? ((IRI)v).toString() : ((OWLLiteral)v).getLiteral();

[balhoff]

That line will fail when the annotation target is a blank node (also suggested by the error).

[matentzn]

Yes, the weird thing is though that this line is in a different method than the above error suggests.. I think this might be a problem with obographs version in owlapi/robot..