diff --git a/src/test/java/hibernateTest/entities/Belong.java b/src/test/java/hibernateTest/entities/Belong.java
new file mode 100644
index 0000000..031df94
--- /dev/null
+++ b/src/test/java/hibernateTest/entities/Belong.java
@@ -0,0 +1,31 @@
+package hibernateTest.entities;
+
+public class Belong {
+    private String uId, gId;
+
+    public Belong(){
+
+    }
+
+    public Belong(String uId, String gId){
+        setuId(uId);
+        setgId(gId);
+    }
+
+    private void setuId(String uId) {
+        this.uId = uId;
+    }
+
+    public String getuId() {
+        return uId;
+    }
+
+    private void setgId(String gId) {
+        this.gId = gId;
+    }
+
+    public String getgId() {
+        return gId;
+    }
+
+}
diff --git a/src/test/resources/Belong.hbm.xml b/src/test/resources/Belong.hbm.xml
new file mode 100644
index 0000000..7f025ca
--- /dev/null
+++ b/src/test/resources/Belong.hbm.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+
+<!--
+  ~ Hibernate, Relational Persistence for Idiomatic Java
+  ~
+  ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+  ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+  -->
+<!DOCTYPE hibernate-mapping PUBLIC
+        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
+        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
+
+<hibernate-mapping package="hibernateTest.entities">
+
+    <class name="Belong" table="BELONGS">
+        <composite-id>
+            <key-property name="uId" column="UID"></key-property>
+            <key-property name="gId" column="GID"></key-property>
+        </composite-id>
+
+    </class>
+
+</hibernate-mapping>
diff --git a/src/test/resources/hibernate.cfg.xml b/src/test/resources/hibernate.cfg.xml
index 34f57fb..9c02d90 100644
--- a/src/test/resources/hibernate.cfg.xml
+++ b/src/test/resources/hibernate.cfg.xml
@@ -38,6 +38,7 @@
         <mapping resource="User.hbm.xml"/>
         <mapping resource="Group.hbm.xml"/>
         <mapping resource="Request.hbm.xml"/>
+        <mapping resource="Belong.hbm.xml"/>
 
     </session-factory>