bdi4jade

diff --git a/bdi-jade/src/bdi4jade/core/Capability.java b/bdi-jade/src/bdi4jade/core/Capability.java
index 85dd5de..6fc40d2 100644
--- a/bdi-jade/src/bdi4jade/core/Capability.java
+++ b/bdi-jade/src/bdi4jade/core/Capability.java
@@ -249,6 +249,9 @@ public class Capability implements Serializable {
 					if (Set.class.isAssignableFrom(field.getType())) {
 						this.getBeliefBase().addBelief(
 								new TransientBeliefSet(name, (Set) value));
+					} else {
+						throw new ClassCastException("Field " + field.getName()
+						+ " should be assignable to " + Set.class.getName());
 					}
 				} else if (field
 						.isAnnotationPresent(bdi4jade.annotation.Plan.class)) {

diff --git a/bdi-jade-test/src/bdi4jade/examples/ping/PingPongCapability.java b/bdi-jade-test/src/bdi4jade/examples/ping/PingPongCapability.java
index 30b6e32..6888e68 100644
--- a/bdi-jade-test/src/bdi4jade/examples/ping/PingPongCapability.java
+++ b/bdi-jade-test/src/bdi4jade/examples/ping/PingPongCapability.java
@@ -22,14 +22,13 @@
 
 package bdi4jade.examples.ping;
 
-import jade.lang.acl.MessageTemplate;
+import bdi4jade.annotation.Belief;
 import bdi4jade.annotation.GoalOwner;
-import bdi4jade.belief.Belief;
-import bdi4jade.belief.TransientBelief;
 import bdi4jade.core.Capability;
 import bdi4jade.goal.Goal;
 import bdi4jade.plan.DefaultPlan;
 import bdi4jade.plan.Plan;
+import jade.lang.acl.MessageTemplate;
 
 /**
  * @author Ingrid Nunes
@@ -43,25 +42,21 @@ public class PingPongCapability extends Capability {
 
 	private static final long serialVersionUID = -4800805796961540570L;
 
-	@bdi4jade.annotation.Belief
-	Belief<String, String> neighbour;
+	@Belief
+	String neighbour;
 
 	@bdi4jade.annotation.Plan
 	private Plan pingPlan = new DefaultPlan(PingGoal.class, PingPlanBody.class);
 
-	@bdi4jade.annotation.Belief
-	Belief<String, Integer> pingTimes;
+	@Belief
+	Integer pingTimes;
 
 	@bdi4jade.annotation.Plan
-	private Plan pongPlan = new DefaultPlan(
-			MessageTemplate.MatchContent(PingPlanBody.MSG_CONTENT),
-			PongPlanBody.class);
+	private Plan pongPlan = new DefaultPlan(MessageTemplate.MatchContent(PingPlanBody.MSG_CONTENT), PongPlanBody.class);
 
 	public PingPongCapability(String neighbour, int pingTimes) {
-		this.neighbour = new TransientBelief<String, String>("neighbour",
-				neighbour);
-		this.pingTimes = new TransientBelief<String, Integer>("pingTimes",
-				pingTimes);
+		this.neighbour = neighbour;
+		this.pingTimes = pingTimes;
 	}
 
 }