diff --git a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
index 8fbd1780b..ac3f255f4 100755
--- a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
+++ b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
@@ -17,6 +17,7 @@ import com.fr.third.org.hibernate.internal.CoreLogging;
 import com.fr.third.org.hibernate.internal.CoreMessageLogger;
 import com.fr.third.org.hibernate.internal.util.ReflectHelper;
 import com.fr.third.org.hibernate.mapping.Component;
+import com.fr.third.org.hibernate.tuple.entity.DefaultEntityRegister;
 
 /**
  * Defines a POJO-based instantiator for use from the tuplizers.
@@ -72,7 +73,11 @@ public class PojoInstantiator implements Instantiator, Serializable {
 
 	public Object instantiate() {
 		if ( isAbstract ) {
-			throw new InstantiationException( "Cannot instantiate abstract class or interface: ", mappedClass );
+			try {
+				return DefaultEntityRegister.getInstance().getDefaultEntityClass().newInstance();
+			} catch (Exception e) {
+				throw new InstantiationException("class not found: ", mappedClass);
+			}
 		}
 		else if ( optimizer != null ) {
 			return optimizer.newInstance();
diff --git a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java
new file mode 100644
index 000000000..fe3932ea7
--- /dev/null
+++ b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java
@@ -0,0 +1,41 @@
+package com.fr.third.org.hibernate.tuple.entity;
+
+/**
+ * Created by Zed on 2018/11/1.
+ */
+public class DefaultEntityRegister {
+
+    private static volatile DefaultEntityRegister instance;
+    private Class defaultEntityClass = null;
+
+    public static DefaultEntityRegister getInstance() {
+        if (instance == null) {
+            synchronized (DefaultEntityRegister.class) {
+                if (instance == null) {
+                    instance = new DefaultEntityRegister();
+                }
+            }
+        }
+        return instance;
+    }
+
+    private DefaultEntityRegister() {
+
+    }
+
+    public void registerDefaultClass(Class defaultEntityClass) {
+        this.defaultEntityClass = defaultEntityClass;
+    }
+
+    public void resetDefaultClass() {
+        this.defaultEntityClass = null;
+    }
+
+    public Class getDefaultEntityClass() {
+        return defaultEntityClass;
+    }
+
+    public void setDefaultEntityClass(Class defaultEntityClass) {
+        this.defaultEntityClass = defaultEntityClass;
+    }
+}