How to solve this Java lang.ClassCastException：org. apache. tomcat. dbcp. dbcp. Basicdatasource cannot be cast to org apache. tomcat. jdbc. pool. DataSource？

I tried to use pool for database connection in Tomcat. This is my context:

<Resource name="jdbc/slingemp" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="root" password="root" driverClassName="com.MysqL.jdbc.Driver"
               url="jdbc:MysqL://localhost:3306/slingemp"/>

This is my web xml：

<description>MysqL JNDI Test</description>
  <resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/slingemp</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>

This is how I connect to the database:

package org.slingemp.jnditest;

import java.io.IOException;
import java.sql.Connection;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.tomcat.jdbc.pool.DataSource;

/**
 * Servlet implementation class JNDILookUpServlet
 */
@WebServlet("/JNDILookUpServlet")
public class JNDILookUpServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public JNDILookUpServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request,HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
        // TODO Auto-generated method stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request,HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request,IOException {
        // TODO Auto-generated method stub
        try {
            Context initContext = new InitialContext();
            Context envContext  = (Context)initContext.lookup("java:/comp/env");
            DataSource ds = (DataSource)envContext.lookup("jdbc/slingemp");
            Connection conn = ds.getConnection();
            if(conn != null)System.out.println("Connected..");
            else System.out.println("Not connected...");
        } catch (Exception e) {
            e.printStackTrace();
        }
        response.sendRedirect("index.jsp");
    }


}

But it gives me the following exceptions:

java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.BasicDataSource cannot be cast to org.apache.tomcat.jdbc.pool.DataSource

Please help me solve this problem,

to greet

Solution

You just used the wrong import

Replace this:

import org.apache.tomcat.jdbc.pool.DataSource;

With this:

import javax.sql.DataSource;

javax. sql. Datasource is the base interface that all datasource implementations must inherit It is generally not recommended to develop in any way other than this interface