diff --git a/src/main/java/com/alibaba/druid/filter/FilterEventAdapter.java b/src/main/java/com/alibaba/druid/filter/FilterEventAdapter.java
index 2e7585cd25..b96ff057d9 100644
--- a/src/main/java/com/alibaba/druid/filter/FilterEventAdapter.java
+++ b/src/main/java/com/alibaba/druid/filter/FilterEventAdapter.java
@@ -301,8 +301,10 @@ public abstract class FilterEventAdapter extends FilterAdapter {
         try {
             ResultSetProxy resultSet = super.statement_executeQuery(chain, statement, sql);
 
-            statementExecuteQueryAfter(statement, sql, resultSet);
-            resultSetOpenAfter(resultSet);
+            if (resultSet != null) {
+                statementExecuteQueryAfter(statement, sql, resultSet);
+                resultSetOpenAfter(resultSet);
+            }
 
             return resultSet;
         } catch (SQLException error) {
@@ -462,9 +464,11 @@ public abstract class FilterEventAdapter extends FilterAdapter {
 
             ResultSetProxy resultSet = chain.preparedStatement_executeQuery(statement);
 
-            statementExecuteQueryAfter(statement, statement.getSql(), resultSet);
+            if (resultSet != null) {
+                statementExecuteQueryAfter(statement, statement.getSql(), resultSet);
 
-            resultSetOpenAfter(resultSet);
+                resultSetOpenAfter(resultSet);
+            }
 
             return resultSet;
         } catch (SQLException error) {
diff --git a/src/main/java/com/alibaba/druid/pool/DruidPooledPreparedStatement.java b/src/main/java/com/alibaba/druid/pool/DruidPooledPreparedStatement.java
index f9139cad2e..4f462272f1 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidPooledPreparedStatement.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidPooledPreparedStatement.java
@@ -180,6 +180,10 @@ public class DruidPooledPreparedStatement extends DruidPooledStatement implement
         conn.beforeExecute();
         try {
             ResultSet rs = stmt.executeQuery();
+            
+            if (rs == null) {
+                return null;
+            }
 
             DruidPooledResultSet poolableResultSet = new DruidPooledResultSet(this, rs);
             resultSetTrace.add(poolableResultSet);
diff --git a/src/main/java/com/alibaba/druid/pool/DruidPooledStatement.java b/src/main/java/com/alibaba/druid/pool/DruidPooledStatement.java
index e402d1472f..b5fa0f6e7f 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidPooledStatement.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidPooledStatement.java
@@ -107,6 +107,10 @@ public class DruidPooledStatement extends PoolableWrapper implements Statement {
         conn.beforeExecute();
         try {
             ResultSet rs = stmt.executeQuery(sql);
+            
+            if (rs == null) {
+                return rs;
+            }
 
             DruidPooledResultSet poolableResultSet = new DruidPooledResultSet(this, rs);
             resultSetTrace.add(poolableResultSet);
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest.java b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest.java
index b6c95ed016..010d02154d 100644
--- a/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest.java
@@ -200,7 +200,7 @@ public class FilterChainImplTest extends TestCase {
         ResultSet rs = stmt.executeQuery();
         rs.next();
         
-        Assert.assertNull(rs.getURL(1));
+        Assert.assertNull(rs.getRowId(1));
         
         rs.close();
         stmt.close();
@@ -215,7 +215,7 @@ public class FilterChainImplTest extends TestCase {
         ResultSet rs = stmt.executeQuery();
         rs.next();
         
-        Assert.assertNull(rs.getURL("1"));
+        Assert.assertNull(rs.getRowId("1"));
         
         rs.close();
         stmt.close();
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest2.java b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest2.java
index e246f5f19e..f6727d889a 100644
--- a/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest2.java
+++ b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest2.java
@@ -3,6 +3,7 @@ package com.alibaba.druid.bvt.filter;
 import java.sql.CallableStatement;
 import java.sql.Connection;
 import java.sql.Types;
+import java.util.Collections;
 
 import junit.framework.Assert;
 import junit.framework.TestCase;
@@ -601,4 +602,48 @@ public class FilterChainImplTest2 extends TestCase {
         stmt.close();
         conn.close();
     }
+    
+    public void test_getObject() throws Exception {
+        Connection conn = dataSource.getConnection();
+        CallableStatement stmt = conn.prepareCall("select ?");
+        stmt.registerOutParameter(1, Types.VARCHAR);
+        
+        Assert.assertNull(stmt.getObject(1));
+        
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_getObject_1() throws Exception {
+        Connection conn = dataSource.getConnection();
+        CallableStatement stmt = conn.prepareCall("select ?");
+        stmt.registerOutParameter(1, Types.VARCHAR);
+        
+        Assert.assertNull(stmt.getObject("1"));
+        
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_getObject_2() throws Exception {
+        Connection conn = dataSource.getConnection();
+        CallableStatement stmt = conn.prepareCall("select ?");
+        stmt.registerOutParameter(1, Types.VARCHAR);
+        
+        Assert.assertNull(stmt.getObject(1, Collections.<String, Class<?>>emptyMap()));
+        
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_getObject_3() throws Exception {
+        Connection conn = dataSource.getConnection();
+        CallableStatement stmt = conn.prepareCall("select ?");
+        stmt.registerOutParameter(1, Types.VARCHAR);
+        
+        Assert.assertNull(stmt.getObject("1", Collections.<String, Class<?>>emptyMap()));
+        
+        stmt.close();
+        conn.close();
+    }
 }
diff --git a/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest3.java b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest3.java
new file mode 100644
index 0000000000..a0de090f6e
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/FilterChainImplTest3.java
@@ -0,0 +1,86 @@
+package com.alibaba.druid.bvt.filter;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.sql.Types;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.mock.MockCallableStatement;
+import com.alibaba.druid.mock.MockConnection;
+import com.alibaba.druid.mock.MockDriver;
+import com.alibaba.druid.mock.MockStatement;
+import com.alibaba.druid.mock.MockStatementBase;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class FilterChainImplTest3 extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setFilters("stat");
+        
+        dataSource.setDriver(new MockDriver() {
+            public ResultSet executeQuery(MockStatementBase stmt, String sql) throws SQLException {
+                return null;
+            }
+            
+            public MockStatement createMockStatement(MockConnection conn) {
+                return new MockStatement(conn) {
+                    public ResultSet getResultSet() throws SQLException {
+                        return null;
+                    }
+                };
+            }
+        });
+
+        dataSource.init();
+    }
+
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+    }
+
+    public void test_executeQuery() throws Exception {
+        Connection conn = dataSource.getConnection();
+        PreparedStatement stmt = conn.prepareStatement("select ?");
+        stmt.setNull(1, Types.VARCHAR);
+        Assert.assertNull(stmt.executeQuery());
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_executeQuery_2() throws Exception {
+        Connection conn = dataSource.getConnection();
+        PreparedStatement stmt = conn.prepareCall("select ?");
+        stmt.setNull(1, Types.VARCHAR);
+        Assert.assertNull(stmt.executeQuery());
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_executeQuery_3() throws Exception {
+        Connection conn = dataSource.getConnection();
+        Statement stmt = conn.createStatement();
+        Assert.assertNull(stmt.executeQuery("select 1"));
+        stmt.close();
+        conn.close();
+    }
+    
+    public void test_execute() throws Exception {
+        Connection conn = dataSource.getConnection();
+        Statement stmt = conn.createStatement();
+        stmt.execute("select 1");
+        Assert.assertNull(stmt.getResultSet());
+        stmt.close();
+        conn.close();
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/TransactionTest.java b/src/test/java/com/alibaba/druid/bvt/pool/TransactionTest.java
new file mode 100644
index 0000000000..55e61934e5
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/pool/TransactionTest.java
@@ -0,0 +1,35 @@
+package com.alibaba.druid.bvt.pool;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+
+public class TransactionTest extends TestCase {
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setTestOnBorrow(false);
+    }
+
+    protected void tearDown() throws Exception {
+        dataSource.close();
+    }
+    
+    public void test_txn() throws Exception {
+        Connection conn = dataSource.getConnection();
+        
+        conn.setAutoCommit(false);
+        for (int i = 0; i < 100; ++i) {
+            PreparedStatement stmt = conn.prepareStatement("select + " + (i % 10));
+            stmt.executeUpdate();
+            stmt.close();
+        }
+        conn.commit();
+        conn.close();
+    }
+}