diff --git a/hessian-lite/src/main/java/com/caucho/hessian/io/Hessian2Output.java b/hessian-lite/src/main/java/com/caucho/hessian/io/Hessian2Output.java
index a8aab727..403c1dc6 100644
--- a/hessian-lite/src/main/java/com/caucho/hessian/io/Hessian2Output.java
+++ b/hessian-lite/src/main/java/com/caucho/hessian/io/Hessian2Output.java
@@ -1329,23 +1329,15 @@ protected void writeRef(int value)
   public boolean addRef(Object object)
     throws IOException
   {
-    if (_isUnshared) {
-      _refCount++;
-      return false;
-    }
-    
-    int newRef = _refCount;
+    int ref = _refs.get(object);
 
-    int ref = addRef(object, newRef, false);
-    
-    if (ref != newRef) {
+    if (ref >= 0) {
       writeRef(ref);
 
       return true;
-    }
-    else {
-      _refCount++;
-      
+    } else {
+      _refs.put(object, _refs.size(),false);
+
       return false;
     }
   }
diff --git a/repeater-plugin-core/pom.xml b/repeater-plugin-core/pom.xml
index 4255039c..1b2374e0 100644
--- a/repeater-plugin-core/pom.xml
+++ b/repeater-plugin-core/pom.xml
@@ -10,6 +10,18 @@
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>repeater-plugin-core</artifactId>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>7</source>
+                    <target>7</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
     <dependencies>
         <dependency>
diff --git a/repeater-plugin-core/src/test/java/com/alibaba/jvm/sandbox/repeater/plugin/core/serialize/HessianSerializerTest.java b/repeater-plugin-core/src/test/java/com/alibaba/jvm/sandbox/repeater/plugin/core/serialize/HessianSerializerTest.java
index b42a7329..e56a0bd4 100644
--- a/repeater-plugin-core/src/test/java/com/alibaba/jvm/sandbox/repeater/plugin/core/serialize/HessianSerializerTest.java
+++ b/repeater-plugin-core/src/test/java/com/alibaba/jvm/sandbox/repeater/plugin/core/serialize/HessianSerializerTest.java
@@ -1,8 +1,16 @@
 package com.alibaba.jvm.sandbox.repeater.plugin.core.serialize;
 
+import com.alibaba.jvm.sandbox.repeater.plugin.core.wrapper.SerializerWrapper;
+import com.alibaba.jvm.sandbox.repeater.plugin.domain.MockInvocation;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
+import java.util.ArrayList;
+import java.util.GregorianCalendar;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 /**
  * {@link }
  * <p>
@@ -41,4 +49,34 @@ public void deserialize() {
             Assert.fail(e.getMessage());
         }
     }
+
+    @Test
+    public void serializeSpec() {
+        List<MockInvocation> list = new ArrayList<>();
+        MockInvocation m1 = new MockInvocation();
+        MockInvocation m2 = new MockInvocation();
+        list.add(m1);
+        list.add(m2);
+
+        Object[] org = new Object[1];
+        org[0] = new GregorianCalendar();
+        m1.setCurrentArgs(org);
+
+        Object xxx = new Object();
+
+        Map<String, Object> map = new HashMap<>();
+        map.put("xx", xxx);
+        map.put("jj", xxx);
+        Object[] ol = new Object[1];
+        ol[0] = map;
+        m2.setCurrentArgs(ol);
+
+        try {
+            String ens = SerializerWrapper.hessianSerialize(list);
+            SerializerWrapper.hessianDeserialize(ens);
+        } catch (SerializeException e) {
+            Assert.assertNull(e);
+        }
+        Assert.assertTrue(true);
+    }
 }
\ No newline at end of file