diff --git a/YACOSCore/ejbModule/org/yacos/core/evaluation/Criterion.java b/YACOSCore/ejbModule/org/yacos/core/evaluation/Criterion.java
index a51b179..794a755 100644
--- a/YACOSCore/ejbModule/org/yacos/core/evaluation/Criterion.java
+++ b/YACOSCore/ejbModule/org/yacos/core/evaluation/Criterion.java
@@ -41,6 +41,10 @@ public class Criterion {
 		this.conference = conference;
 	}
 
+	public Criterion() {
+		// TODO Auto-generated constructor stub
+	}
+
 	@ManyToOne(targetEntity=Conference.class)
 	@JoinColumn(name="conference_id",nullable=false)
 	public Conference getConference(){