diff --git a/src/main/java/com/alibaba/druid/jconsole/ConnectionsPanel.java b/src/main/java/com/alibaba/druid/jconsole/ConnectionsPanel.java
index 2967228618..9786c4b7b0 100644
--- a/src/main/java/com/alibaba/druid/jconsole/ConnectionsPanel.java
+++ b/src/main/java/com/alibaba/druid/jconsole/ConnectionsPanel.java
@@ -10,7 +10,11 @@ import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTable;
 
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
+
 public class ConnectionsPanel extends JPanel {
+    private final static Log LOG = LogFactory.getLog(ConnectionsPanel.class);
 
     private static final long     serialVersionUID = 1L;
 
@@ -61,7 +65,7 @@ public class ConnectionsPanel extends JPanel {
             this.setLayout(new BorderLayout());
             this.add(tableScrollPane, BorderLayout.CENTER);
         } catch (Exception e) {
-            e.printStackTrace();
+            LOG.error(e.getMessage(), e);
         }
     }
 
diff --git a/src/main/java/com/alibaba/druid/jconsole/DruidPanel.java b/src/main/java/com/alibaba/druid/jconsole/DruidPanel.java
index cdd0dde88c..7360e51dc4 100644
--- a/src/main/java/com/alibaba/druid/jconsole/DruidPanel.java
+++ b/src/main/java/com/alibaba/druid/jconsole/DruidPanel.java
@@ -30,12 +30,15 @@ import javax.swing.event.TreeSelectionListener;
 import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.TreeSelectionModel;
 
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
 import com.alibaba.druid.pool.DruidDataSource;
 import com.alibaba.druid.stat.JdbcStatManager;
 import com.sun.tools.jconsole.JConsoleContext;
 
 public class DruidPanel extends JPanel {
-
+    private final static Log LOG = LogFactory.getLog(DruidPanel.class);
+    
     private static final long        serialVersionUID = 1L;
 
     protected JSplitPane             mainSplit;
@@ -208,7 +211,7 @@ public class DruidPanel extends JPanel {
                     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                     frame.setVisible(true);
                 } catch (Exception e) {
-                    e.printStackTrace();
+                    LOG.error(e.getMessage(), e);
                 }
             }
         });
diff --git a/src/main/java/com/alibaba/druid/jconsole/SQLPanel.java b/src/main/java/com/alibaba/druid/jconsole/SQLPanel.java
index 39be57d87f..f920507602 100644
--- a/src/main/java/com/alibaba/druid/jconsole/SQLPanel.java
+++ b/src/main/java/com/alibaba/druid/jconsole/SQLPanel.java
@@ -25,8 +25,12 @@ import javax.swing.table.DefaultTableColumnModel;
 import javax.swing.table.TableColumn;
 import javax.swing.table.TableRowSorter;
 
-public class SQLPanel extends JPanel {
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
 
+public class SQLPanel extends JPanel {
+    private final static Log LOG = LogFactory.getLog(SQLPanel.class);
+    
     private static final long     serialVersionUID = 1L;
 
     private MBeanServerConnection connection;
@@ -108,7 +112,7 @@ public class SQLPanel extends JPanel {
             this.setLayout(new BorderLayout());
             this.add(tableScrollPane, BorderLayout.CENTER);
         } catch (Exception e) {
-            e.printStackTrace();
+            LOG.error(e.getMessage(), e);
         }
     }
 
@@ -159,7 +163,7 @@ public class SQLPanel extends JPanel {
             tableModel.setRowData(rows);
             tableModel.fireTableRowsInserted(0, rows.length);
         } catch (Exception e) {
-            e.printStackTrace();
+            LOG.error(e.getMessage(), e);
         }
     }
 
diff --git a/src/main/java/com/alibaba/druid/mock/MockDriver.java b/src/main/java/com/alibaba/druid/mock/MockDriver.java
index 4c0778b7d2..1af916d37f 100644
--- a/src/main/java/com/alibaba/druid/mock/MockDriver.java
+++ b/src/main/java/com/alibaba/druid/mock/MockDriver.java
@@ -28,10 +28,14 @@ import java.sql.SQLXML;
 import java.util.Properties;
 import java.util.concurrent.atomic.AtomicLong;
 
+import com.alibaba.druid.jconsole.SQLPanel;
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
 import com.alibaba.druid.mock.handler.MockExecuteHandler;
 import com.alibaba.druid.mock.handler.MySqlMockExecuteHandlerImpl;
 
 public class MockDriver implements Driver {
+    private final static Log LOG = LogFactory.getLog(MockDriver.class);
 
     public final static MockExecuteHandler DEFAULT_HANDLER      = new MySqlMockExecuteHandlerImpl();
 
@@ -67,7 +71,7 @@ public class MockDriver implements Driver {
 
             return true;
         } catch (Exception e) {
-            e.printStackTrace();
+            LOG.error("registerDriver error", e);
         }
 
         return false;
diff --git a/src/main/java/com/alibaba/druid/pool/ConnectionHolder.java b/src/main/java/com/alibaba/druid/pool/ConnectionHolder.java
index 024fe7950f..10f2207d03 100644
--- a/src/main/java/com/alibaba/druid/pool/ConnectionHolder.java
+++ b/src/main/java/com/alibaba/druid/pool/ConnectionHolder.java
@@ -24,11 +24,15 @@ import java.util.concurrent.CopyOnWriteArrayList;
 import javax.sql.ConnectionEventListener;
 import javax.sql.StatementEventListener;
 
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
+
 /**
  * @author wenshao<szujobs@hotmail.com>
  */
 public final class ConnectionHolder {
-
+    private final static Log LOG = LogFactory.getLog(ConnectionHolder.class);
+    
     private final DruidAbstractDataSource               dataSource;
     private final Connection                    conn;
     private final List<ConnectionEventListener> connectionEventListeners = new CopyOnWriteArrayList<ConnectionEventListener>();
@@ -120,7 +124,7 @@ public final class ConnectionHolder {
                     stmt.close();
                 }
             } catch (SQLException ex) {
-                ex.printStackTrace(); //
+                LOG.error("close statement error", ex);
             }
         }
         statementTrace.clear();
diff --git a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
index 1670ba0757..17b6d9634a 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
@@ -601,13 +601,6 @@ public abstract class DruidAbstractDataSource implements DruidAbstractDataSource
         return logWriter;
     }
 
-    protected void printStackTrace(Throwable e) {
-        if (logWriter != null) {
-            e.printStackTrace(logWriter);
-            logWriter.flush();
-        }
-    }
-
     @Override
     public void setLogWriter(PrintWriter out) throws SQLException {
         this.logWriter = out;
diff --git a/src/main/java/com/alibaba/druid/pool/PoolableStatement.java b/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
index b5140b26ed..dc24bddd14 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
@@ -24,11 +24,15 @@ import java.sql.Statement;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
+
 /**
  * @author wenshao<szujobs@hotmail.com>
  */
 public class PoolableStatement extends PoolableWrapper implements Statement {
-
+    private final static Log LOG = LogFactory.getLog(PoolableStatement.class);
+    
     private final Statement         stmt;
     protected PoolableConnection    conn;
     protected final List<ResultSet> resultSetTrace = new ArrayList<ResultSet>();
@@ -62,7 +66,7 @@ public class PoolableStatement extends PoolableWrapper implements Statement {
                     rs.close();
                 }
             } catch (SQLException ex) {
-                ex.printStackTrace(); //
+                LOG.error("clearResultSet error", ex);
             }
         }
         resultSetTrace.clear();
diff --git a/src/main/java/com/alibaba/druid/proxy/DruidDriver.java b/src/main/java/com/alibaba/druid/proxy/DruidDriver.java
index a9aa765d50..4184b8d0a1 100644
--- a/src/main/java/com/alibaba/druid/proxy/DruidDriver.java
+++ b/src/main/java/com/alibaba/druid/proxy/DruidDriver.java
@@ -29,6 +29,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 
 import com.alibaba.druid.filter.Filter;
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
+import com.alibaba.druid.pool.PoolableStatement;
 import com.alibaba.druid.proxy.config.AbstractDruidFilterConfig;
 import com.alibaba.druid.proxy.config.DruidFilterConfigLoader;
 import com.alibaba.druid.proxy.jdbc.DataSourceProxy;
@@ -43,7 +46,8 @@ import com.alibaba.druid.util.JdbcUtils;
  * @author wenshao<szujobs@hotmail.com>
  */
 public class DruidDriver implements Driver, DruidDriverMBean {
-
+    private final static Log LOG = LogFactory.getLog(DruidDriver.class);
+    
     private final static DruidDriver                                instance                 = new DruidDriver();
 
     private final static ConcurrentMap<String, DataSourceProxyImpl> proxyDataSources         = new ConcurrentHashMap<String, DataSourceProxyImpl>();
@@ -75,7 +79,7 @@ public class DruidDriver implements Driver, DruidDriverMBean {
 
             return true;
         } catch (Exception e) {
-            e.printStackTrace();
+            LOG.error("registerDriver error", e);
         }
 
         return false;
diff --git a/src/main/java/com/alibaba/druid/util/DruidLoaderUtils.java b/src/main/java/com/alibaba/druid/util/DruidLoaderUtils.java
index d3e5c4802a..c20373b657 100644
--- a/src/main/java/com/alibaba/druid/util/DruidLoaderUtils.java
+++ b/src/main/java/com/alibaba/druid/util/DruidLoaderUtils.java
@@ -21,6 +21,9 @@ import java.util.List;
 
 import com.alibaba.druid.filter.Filter;
 import com.alibaba.druid.filter.FilterManager;
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
+import com.alibaba.druid.proxy.DruidDriver;
 import com.alibaba.druid.proxy.config.AbstractDruidFilterConfig;
 
 /**
@@ -29,7 +32,8 @@ import com.alibaba.druid.proxy.config.AbstractDruidFilterConfig;
  * @author gang.su
  */
 public class DruidLoaderUtils {
-
+    private final static Log LOG = LogFactory.getLog(DruidLoaderUtils.class);
+    
     public static void loadFilter(List<Filter> filterList, List<AbstractDruidFilterConfig> druidFilterConfigList) throws SQLException {
         for (Iterator<AbstractDruidFilterConfig> iterator = druidFilterConfigList.iterator(); iterator.hasNext();) {
             AbstractDruidFilterConfig druidFilterConfig = iterator.next();
@@ -131,7 +135,7 @@ public class DruidLoaderUtils {
         try {
             clazz = Thread.currentThread().getContextClassLoader().loadClass(className);
         } catch (ClassNotFoundException e) {
-            e.printStackTrace();
+            LOG.error("load class error", e);
         }
 
         if (clazz == null) {
@@ -149,7 +153,7 @@ public class DruidLoaderUtils {
         try {
             return Class.forName(className);
         } catch (ClassNotFoundException e) {
-            e.printStackTrace();
+            // skip
         }
 
         return null;