diff --git a/pom.xml b/pom.xml
index 2c08f414d4..c6494d335d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -13,18 +13,6 @@
 	<inceptionYear>2012</inceptionYear>
 
 	<repositories>
-		<repository>
-			<id>oracleReleases</id>
-			<name>Oracle Released Java Packages</name>
-			<url>http://download.oracle.com/maven</url>
-			<layout>default</layout>
-		</repository>
-		<repository>
-			<id>vars.sourceforge.net</id>
-			<name>vars.sourceforge.net</name>
-			<url>http://vars.sourceforge.net/maven2/</url>
-			<layout>default</layout>
-		</repository>
 		<repository>
 			<id>bonecp</id>
 			<name>bonecp</name>
@@ -247,7 +235,7 @@
 		<dependency>
 			<groupId>mysql</groupId>
 			<artifactId>mysql-connector-java</artifactId>
-			<version>5.0.4</version>
+			<version>5.1.20</version>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLShardingVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLShardingVisitor.java
new file mode 100644
index 0000000000..308ded30f2
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLShardingVisitor.java
@@ -0,0 +1,17 @@
+package com.alibaba.druid.sql.visitor;
+
+import com.alibaba.druid.sql.ast.SQLObject;
+import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
+
+public class SQLShardingVisitor extends SQLASTVisitorAdapter {
+    
+    public void postVisit(SQLObject x) {
+    }
+
+    public void preVisit(SQLObject x) {
+    }
+
+    public boolean visit(SQLInsertStatement x) {
+        return false;
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/TestActiveTrace.java b/src/test/java/com/alibaba/druid/bvt/pool/TestActiveTrace.java
new file mode 100644
index 0000000000..7ac09e20fe
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/pool/TestActiveTrace.java
@@ -0,0 +1,50 @@
+package com.alibaba.druid.bvt.pool;
+
+import java.lang.management.ManagementFactory;
+import java.sql.Connection;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.stat.DruidDataSourceStatManager;
+
+public class TestActiveTrace extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+
+        dataSource = new DruidDataSource();
+        dataSource.setRemoveAbandoned(true);
+        dataSource.setRemoveAbandonedTimeoutMillis(10);
+        dataSource.setLogAbandoned(true);
+        dataSource.setTimeBetweenEvictionRunsMillis(10);
+        dataSource.setMinEvictableIdleTimeMillis(300 * 1000);
+        dataSource.setUrl("jdbc:mock:xxx");
+
+    }
+
+    protected void tearDown() throws Exception {
+        dataSource.close();
+        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
+    }
+
+    public void test_activeTrace() throws Exception {
+        for (int i = 0; i < 1000 * 1000; ++i) {
+            dataSource.shrink();
+
+            Connection conn = dataSource.getConnection();
+            conn.close();
+            // Assert.assertEquals(1, dataSource.getPoolingCount());
+            dataSource.shrink();
+            Assert.assertEquals(0, dataSource.getPoolingCount());
+            Assert.assertEquals(0, dataSource.getActiveConnections().size());
+
+            if (i % 5000 == 0) {
+                System.out.println(ManagementFactory.getClassLoadingMXBean().getLoadedClassCount());
+            }
+        }
+    }
+}