连接数据库时出错：无法为连接 URL 'null' 创建类 '' 的 JDBC 驱动程序

【问题标题】：Error connecting database: Cannot create JDBC driver of class '' for connect URL 'null'连接数据库时出错：无法为连接 URL 'null' 创建类 '' 的 JDBC 驱动程序
【发布时间】：2014-07-21 03:08:16
【问题描述】：

使用 java 连接数据库时出现以下错误：

type Exception report

message java.lang.RuntimeException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.RuntimeException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.RuntimeException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
    com.skf.support.setup.data.database.DBConnectionFactory.getConnection(DBConnectionFactory.java:32)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:25)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:54)
    com.skf.support.setup.data.login.LoginFormValidator.validate(LoginFormValidator.java:28)
    org.apache.jsp.modules.login.doLogin_jsp._jspService(doLogin_jsp.java:132)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452)
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    com.skf.support.setup.data.database.DBConnectionFactory.getConnection(DBConnectionFactory.java:23)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:25)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:54)
    com.skf.support.setup.data.login.LoginFormValidator.validate(LoginFormValidator.java:28)
    org.apache.jsp.modules.login.doLogin_jsp._jspService(doLogin_jsp.java:132)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.sql.SQLException: No suitable driver
    java.sql.DriverManager.getDriver(DriverManager.java:315)
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1437)
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    com.skf.support.setup.data.database.DBConnectionFactory.getConnection(DBConnectionFactory.java:23)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:25)
    com.skf.support.setup.data.user.UserDao.checkUser(UserDao.java:54)
    com.skf.support.setup.data.login.LoginFormValidator.validate(LoginFormValidator.java:28)
    org.apache.jsp.modules.login.doLogin_jsp._jspService(doLogin_jsp.java:132)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

我正在使用 phpmyadmin，我的数据库名称是：sfsupportconnectionpool

这是我的 web.xml 

  <resource-ref>
    <description>Resource reference to a factory for java.sql.Connection instances 
        that may be used for talking to a particular database 
        that is configured in the Context
        configuration for the web application.</description>
    <res-ref-name>jdbc/SFSupportConnectionPool</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/SFSupportConnectionPool">
    <Resource 
        name="jdbc/SFSupportConnectionPool" 
        auth="Container"
        type="javax.sql.DataSource"
        maxActive="100"
        maxIdle="30"
        maxWait="10000"
        username="dbadmin" password="12345"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost:3306/sf_support?autoReconnect=true" 
        connectionProperties="removeAbandoned=true; removeAbandonedTimeout=60;"/>
</Context>

连接数据库的类：DBConnection.java

package com.skf.support.setup.data.database;

import java.sql.Connection;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class DBConnectionFactory{
    private static String dbName = "SFSupportConnectionPool";

    public static Connection getConnection(){
        Context initContext;
        try{
            initContext = new InitialContext();
            Context envContext = (Context) initContext.lookup("java:/comp/env");
            DataSource ds = (DataSource) envContext.lookup("jdbc/" + DBConnectionFactory.dbName);
            Connection conn = ds.getConnection();
            return conn;
        }
        catch (NamingException e){
            e.printStackTrace();
            throw new RuntimeException(e);
        }
        catch (SQLException e){
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
}

我尝试了很多方法，但对我来说不起作用。谁能建议我这里可能出了什么问题？我自己没有创建项目，我只是想将数据库连接到 jsp 应用程序。任何帮助，将不胜感激。！谢谢

【问题讨论】：

    标签： java mysql jsp jdbc


    【解决方案1】：

    你必须把mysql的jar文件放在tomcat服务器的lib目录下。

    （例如：C:\Program Files\Apache Software Foundation\Apache Tomcat 8.0.3\lib）

    【讨论】：

    • 我以某种方式解决了这个问题。这是tomcat的问题，实际上都是删除并重新安装的事情。这些事情我都做得很好。
    【解决方案2】：

    我测试了本教程，它完美运行http://tomcat.apache.org/tomcat-7.0-doc/jndi-datasource-examples-howto.html；

    你必须阅读并理解它，别担心它很容易，我只花了10分钟就完成了。

    这是我的测试项目，我很确定它会起作用。

    https://www.dropbox.com/s/xx5i3zip5ohmls9/testt.zip

    【讨论】：

    • 也许我在使用 Eclipse 导入它时犯了一个错误，因为我的设置让我很困惑。不过感谢您的帮助。
    猜你喜欢
    • 2011-11-08
    • 2018-01-14
    • 2011-05-14
    • 2011-07-06
    • 2015-04-15
    • 2015-12-18
    • 2014-01-25
    • 2019-02-05
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode