小编Abd*_*yeb的帖子

我正在尝试使用数据源将我的Servlet连接到mysql数据库.但每当我运行我的servlet时,我最终得到这个异常:

java.lang.AbstractMethodError: com.mysql.jdbc.Connection.isValid(I)Z
    org.apache.tomcat.dbcp.dbcp2.DelegatingConnection.isValid(DelegatingConnection.java:913)
    org.apache.tomcat.dbcp.dbcp2.PoolableConnection.validate(PoolableConnection.java:282)
    org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:356)
    org.apache.tomcat.dbcp.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2306)
    org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2289)
    org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2038)
    org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1532)
    Servlet.AbdulTayyebs.processRequest(AbdulTayyebs.java:36)
    Servlet.AbdulTayyebs.doGet(AbdulTayyebs.java:57)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

这是我的Content.xml

<Resource name="jdbc/abdultayyebs" auth="Container"
          type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://127.0.0.1:4000/abdultayyebs?zeroDateTimeBehavior=convertToNull"
          username="root" password="february1996" maxActive="5" maxIdle="2"
          maxWait="1000"/>

这是我的web.xml

  <resource-ref>
  <description>DB Connection</description>
  <res-ref-name>jdbc/abdultayyebs</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth></resource-ref>

这是我的servlet AbdulTayyebs

 import java.io.IOException;
 import java.io.PrintWriter; 
 import java.sql.Connection;
 import java.sql.SQLException;
 import javax.naming.Context;
 import javax.naming.InitialContext;
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.sql.DataSource;

 public class AbdulTayyebs extends HttpServlet {

  DataSource ds=null;  

 @Override
 public void init(ServletConfig config)throws ServletException{
    try {
     Context initContext = new …