diff --git a/org.alibrary.backend/src/main/java/org/alibrary/backend/model/Buch.java b/org.alibrary.backend/src/main/java/org/alibrary/backend/model/Buch.java
index a5fa974..6ce44a5 100644
--- a/org.alibrary.backend/src/main/java/org/alibrary/backend/model/Buch.java
+++ b/org.alibrary.backend/src/main/java/org/alibrary/backend/model/Buch.java
@@ -1,5 +1,7 @@
 package org.alibrary.backend.model;
 
+import java.io.Serializable;
+
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
@@ -12,7 +14,9 @@
 import org.joda.time.LocalDate;
 
 @Entity
-public class Buch {
+public class Buch implements Serializable{
+
+	private static final long serialVersionUID = 1L;
 
 	@Id
 	@GeneratedValue