Casting Problem

[shyamaW]

Hello

I would appreciate it if you could assist me in solving the below mention problem.

In the below code, the line "else if (isSubClassesOfvisisted(visited, (OWLClass) superClass.getSuperClass())) {", shows the exception as
output:
owl:Thing
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: uk.ac.manchester.cs.owl.owlapi.OWLObjectSomeValuesFromImpl cannot be cast to org.semanticweb.owlapi.model.OWLClass

How to resolve this problem?

---

for (OWLSubClassOfAxiom superClass : supClassList) {
// System.out.println(superClass.getSuperClass());
if (visited.contains(superClass.getSuperClass())) {
visited.add(subClass);
value = true;
} else if (isSubClassesOfvisisted(visited, (OWLClass) superClass.getSuperClass())) {
value = true;
visited.add(subClass);
} else {
value = false;
}
}

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: uk.ac.manchester.cs.owl.owlapi.OWLObjectSomeValuesFromImpl cannot be cast to org.semanticweb.owlapi.model.OWLClass

[ignazio1977]

Hi,
you're trying to cast an OWLClassExpression to OWLClass (in this case it's an existential restriction, i.e., SomeValuesFrom)
You should check if the object is anonymous or not before casting it.

[shyamaW]

Thank you very much for your explanation. Got it :)