diff --git a/src/main/java/com/inteligr8/activiti/doclet/ActivitiDocFilter.java b/src/main/java/com/inteligr8/activiti/doclet/ActivitiDocFilter.java
index 3d35afc..310096e 100644
--- a/src/main/java/com/inteligr8/activiti/doclet/ActivitiDocFilter.java
+++ b/src/main/java/com/inteligr8/activiti/doclet/ActivitiDocFilter.java
@@ -28,6 +28,8 @@ import javax.lang.model.element.ElementKind;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.Modifier;
 import javax.lang.model.element.TypeElement;
+import javax.lang.model.type.DeclaredType;
+import javax.lang.model.type.TypeKind;
 import javax.lang.model.type.TypeMirror;
 
 import org.slf4j.Logger;
@@ -102,22 +104,34 @@ class ActivitiDocFilter {
 		Set<String> taskListenerMethodElements = new HashSet<>(5);
 
 		// getAllTypeElements() will get inherited interfaces
-		for (TypeMirror interfaceType : classElement.getInterfaces()) {
-			this.logger.trace("Found interface '{}' on bean '{}'", interfaceType, beanId);
-			
-			switch (interfaceType.toString()) {
-				case INTERFACE_JAVA_DELEGATE:
-					this.logger.debug("The bean '{}' is a JavaDelegate", beanId);
-					delegateMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
-					break;
-				case INTERFACE_EXECUTION_LISTENER:
-					this.logger.debug("The bean '{}' is a ExecutionListener", beanId);
-					executionListenerMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
-					break;
-				case INTERFACE_TASK_LISTENER:
-					this.logger.debug("The bean '{}' is a TaskListener", beanId);
-					taskListenerMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
-					break;
+		TypeElement superclassElement = classElement;
+		while (superclassElement != null) {
+			for (TypeMirror interfaceType : superclassElement.getInterfaces()) {
+				this.logger.trace("Found interface '{}' on bean '{}'", interfaceType, beanId);
+				
+				switch (interfaceType.toString()) {
+					case INTERFACE_JAVA_DELEGATE:
+						this.logger.debug("The bean '{}' is a JavaDelegate", beanId);
+						delegateMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
+						break;
+					case INTERFACE_EXECUTION_LISTENER:
+						this.logger.debug("The bean '{}' is a ExecutionListener", beanId);
+						executionListenerMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
+						break;
+					case INTERFACE_TASK_LISTENER:
+						this.logger.debug("The bean '{}' is a TaskListener", beanId);
+						taskListenerMethodElements.addAll(this.toStrings(this.docenv.getTypeUtils().asElement(interfaceType).getEnclosedElements()));
+						break;
+				}
+			}
+
+			TypeMirror superclassMirror = superclassElement.getSuperclass();
+			if (superclassMirror == null) {
+				superclassElement = null;
+			} else if (superclassMirror.getKind() != TypeKind.DECLARED) {
+				superclassElement = null;
+			} else {
+				superclassElement = (TypeElement) ((DeclaredType) superclassMirror).asElement();
 			}
 		}