diff --git a/src/main/resources/Group.hbm.xml b/src/main/resources/Group.hbm.xml
index ea83ccd..e73bee2 100644
--- a/src/main/resources/Group.hbm.xml
+++ b/src/main/resources/Group.hbm.xml
@@ -15,8 +15,8 @@
     <class name="Group" table="GROUPS">
         <id name="gId" column="GID">
         </id>
-        <property name="uri" column="URI"/>
-        <property name="name" column="NAME"/>
+        <property name="uri" column="URI" not-null="true"/>
+        <property name="name" column="NAME" not-null="true"/>
         <set name = "requests" cascade="all">
             <key column = "GID" not-null="false"/>
             <one-to-many class="Request"/>