JDBC连接池不重新打开tomcat中的连接

          auth="Container"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://localhost:3306/mydb"
          username="myuser"
          password="mypassword"
          initialSize="10"
          maxActive="100"
          maxIdle="20"
          minIdle="15"
          removeAbandoned="true"
          removeAbandonedTimeout="60"
          logAbandoned="true"
          validationQuery="SELECT 1"
          testOnBorrow="true"
          testWhileIdle="true"
          timeBetweenEvictionRunsMillis="30000"
          numTestsPerEvictionRun="10"
          minEvictableIdleTimeMillis="60000"
          jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;
          org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
/>

Context ctx = new InitialContext();
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/myDataSource");
Connection conn = ds.getConnection();

conn.close();