diff --git a/src/main/java/com/alibaba/druid/pool/DruidConnectionHolder.java b/src/main/java/com/alibaba/druid/pool/DruidConnectionHolder.java
index 035d52fdf6..46088b0fd2 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidConnectionHolder.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidConnectionHolder.java
@@ -215,10 +215,9 @@ public final class DruidConnectionHolder {
             buf.append("\"");
         }
 
-        PreparedStatementPool statmentPool = this.getStatementPool();
-        if (statmentPool != null && statmentPool.getMap().size() > 0) {
+        if (statementPool != null && statementPool.getMap().size() > 0) {
             buf.append("\", CachedStatementCount:");
-            buf.append(this.getStatementPool().getMap().size());
+            buf.append(statementPool.getMap().size());
         }
 
         buf.append("}");
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/DruidConnectionHolderTest4.java b/src/test/java/com/alibaba/druid/bvt/pool/DruidConnectionHolderTest4.java
new file mode 100644
index 0000000000..fefe89d08b
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/pool/DruidConnectionHolderTest4.java
@@ -0,0 +1,59 @@
+package com.alibaba.druid.bvt.pool;
+
+import java.lang.reflect.Field;
+import java.sql.PreparedStatement;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.pool.DruidConnectionHolder;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.pool.DruidPooledConnection;
+
+public class DruidConnectionHolderTest4 extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setTestOnBorrow(false);
+        dataSource.setPoolPreparedStatements(true);
+
+    }
+
+    protected void tearDown() throws Exception {
+        dataSource.close();
+    }
+
+    public void test_toString() throws Exception {
+        DruidPooledConnection conn = dataSource.getConnection();
+
+        DruidConnectionHolder holder = conn.getConnectionHolder();
+
+        Field field = DruidConnectionHolder.class.getDeclaredField("statementPool");
+        field.setAccessible(true);
+        Assert.assertNull(field.get(holder));
+
+        holder.toString();
+
+        Assert.assertNull(field.get(holder));
+
+        holder.getStatementPool();
+
+        Assert.assertNotNull(field.get(holder));
+
+        holder.toString();
+
+        PreparedStatement stmt = conn.prepareStatement("select 1");
+        stmt.execute();
+        stmt.close();
+
+        conn.close();
+        
+        Assert.assertEquals(1, holder.getStatementPool().size());
+        
+        holder.toString();
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/DruidDataSourceFactoryTest1.java b/src/test/java/com/alibaba/druid/bvt/pool/DruidDataSourceFactoryTest1.java
index fa6a574fae..41508b1d54 100644
--- a/src/test/java/com/alibaba/druid/bvt/pool/DruidDataSourceFactoryTest1.java
+++ b/src/test/java/com/alibaba/druid/bvt/pool/DruidDataSourceFactoryTest1.java
@@ -160,4 +160,12 @@ public class DruidDataSourceFactoryTest1 extends TestCase {
             JdbcUtils.close(dataSource);
         }
     }
+
+    public void test_getObjectInstance() throws Exception {
+        Assert.assertNull(new DruidDataSourceFactory().getObjectInstance(null, null, null, null));
+    }
+    
+    public void test_getObjectInstance_1() throws Exception {
+        Assert.assertNull(new DruidDataSourceFactory().getObjectInstance(new Object(), null, null, null));
+    }
 }