support spring 2.0

src/main/java/com/alibaba/druid/filter/stat/StatFilter.java

@@ -643,7 +643,7 @@ public class StatFilter extends FilterEventAdapter implements StatFilterMBean {
         return dataSource.getUrl();
     }
 
-    public final JdbcSqlStat createSqlStat(StatementProxy statement, String sql) {
+    public JdbcSqlStat createSqlStat(StatementProxy statement, String sql) {
         final ConcurrentMap<String, JdbcSqlStat> sqlStatMap = dataSourceStat.getSqlStatMap();
         JdbcSqlStat sqlStat = sqlStatMap.get(sql);
         if (sqlStat == null) {

src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java

@@ -218,6 +218,9 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
     }
 
     public void setOracle(boolean isOracle) {
+        if (inited) {
+            throw new IllegalStateException();
+        }
         this.isOracle = isOracle;
     }
 

src/main/java/com/alibaba/druid/support/spring/DruidNativeJdbcExtractor.java

@@ -1,7 +1,33 @@
 package com.alibaba.druid.support.spring;
 
-import org.springframework.jdbc.support.nativejdbc.Jdbc4NativeJdbcExtractor;
+import java.sql.CallableStatement;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
 
-public class DruidNativeJdbcExtractor extends Jdbc4NativeJdbcExtractor {
+import org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter;
 
+public class DruidNativeJdbcExtractor extends NativeJdbcExtractorAdapter {
+
+    protected Connection doGetNativeConnection(Connection con) throws SQLException {
+        return (Connection) con.unwrap(Connection.class);
+    }
+
+    public Statement getNativeStatement(Statement stmt) throws SQLException {
+        return (Statement) stmt.unwrap(Statement.class);
+    }
+
+    public PreparedStatement getNativePreparedStatement(PreparedStatement ps) throws SQLException {
+        return (PreparedStatement) ps.unwrap(PreparedStatement.class);
+    }
+
+    public CallableStatement getNativeCallableStatement(CallableStatement cs) throws SQLException {
+        return (CallableStatement) cs.unwrap(CallableStatement.class);
+    }
+
+    public ResultSet getNativeResultSet(ResultSet rs) throws SQLException {
+        return (ResultSet) rs.unwrap(ResultSet.class);
+    }
 }