Catch resource without type error!

src/main/kotlin/ch/memobase/rdf/InvalidInputException.kt

+package ch.memobase.rdf
+
+class InvalidInputException(message: String) : Exception(message)

src/main/kotlin/ch/memobase/rdf/MemobaseModel.kt

@@ -24,8 +24,12 @@ class MemobaseModel : ModelCom(Factory.createGraphMem()) {
 
     fun listRicoResourceSubjects(): Iterable<RicoResource> {
         return this.listSubjects().mapWith {
+            try {
                 RicoResource(it)
-        }.toList()
+            } catch (ex: InvalidInputException) {
+                null
+            }
+        }.toList().filterNotNull()
     }
 
     override fun toString(): String {

src/main/kotlin/ch/memobase/rdf/RicoResource.kt

@@ -8,6 +8,7 @@ import org.apache.jena.rdf.model.RDFNode
 import org.apache.jena.rdf.model.Statement
 import org.apache.jena.riot.RDFDataMgr
 import org.apache.jena.riot.RDFFormat
+import org.apache.logging.log4j.LogManager
 import org.memobase.rdf.RDF
 import org.memobase.rdf.RICO
 
@@ -17,9 +18,21 @@ class RicoResource(val resource: Resource) {
         resource.addProperty(RDF.type, rdfType).addProperty(RICO.type, ricoType)
     )
 
-    private var rdfType = resource.getProperty(RDF.type).resource
+    private val log = LogManager.getLogger("RicoResource")
+
+    private var rdfType = retrieveRdfType(resource)
     private val ricoType: String? = resource.getProperty(RICO.type)?.string
 
+    private fun retrieveRdfType(resource: Resource): Resource {
+        return try {
+            resource.getProperty(RDF.type).resource
+        } catch (ex: IllegalStateException) {
+            val message = "Resource without a ricoType: $resource." + ex.localizedMessage
+            log.error(message)
+            throw InvalidInputException(message)
+        }
+    }
+
     private fun getLabel(): String {
         return when (rdfType) {
             RICO.Identifier -> getStringLiteral(RICO.identifier).orEmpty()