无法加载JDBC驱动程序类＆＃39; com.mysql.cj.jdbc.driver＆＃39;

时间：2017-11-25 22:14:39

标签： mysql eclipse maven spring-mvc jdbc

我是Spring MVC初学者，使用Tomcat 9和Eclipse运行spring应用程序。我在运行时收到以下错误。

org.apache.jasper.JasperException: An exception occurred processing JSP page [/WEB-INF/views/listOrganization1.jsp] at line [13]

    10: </head>
    11: <body>
    12:     <h1>Listing organizations using JSTL SQL tag</h1>
    13:     <sql:query var="rs" dataSource="jdbc/springdb">
    14:         SELECT * FROM organization
    15:     </sql:query>
    16:     


    Stacktrace:
        org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:588)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:170)
        org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:314)
        org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1325)
        org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1069)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1008)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)


    Root Cause
    javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Cannot load JDBC driver class 'com.mysql.cj.jdbc.driver'"
        org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:669)
        org.apache.jsp.WEB_002dINF.views.listOrganization1_jsp._jspService(listOrganization1_jsp.java:156)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:170)
        org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:314)
        org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1325)
        org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1069)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1008)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)


    Root Cause
    javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Cannot load JDBC driver class 'com.mysql.cj.jdbc.driver'"
        org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.getConnection(QueryTagSupport.java:285)
        org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doStartTag(QueryTagSupport.java:168)
        org.apache.jsp.WEB_002dINF.views.listOrganization1_jsp._jspx_meth_sql_005fquery_005f0(listOrganization1_jsp.java:180)
        org.apache.jsp.WEB_002dINF.views.listOrganization1_jsp._jspService(listOrganization1_jsp.java:135)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:170)
        org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:314)
        org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1325)
        org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1069)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1008)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

但mysql-connector-java-6.0.6.jar已作为Maven依赖项存在于项目中

enter image description here

而context.xml已经为Tomcat提供了数据库信息作为资源

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
--><!-- The contents of this file will be loaded for each web application --><Context>

    <!-- Default set of monitored resources. If one of these changes, the    -->
    <!-- web application will be reloaded.                                   -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <Resource name="jdbc/springdb" auth="Container" type="javax.sql.DataSource"
               maxTotal="100" maxIdle="30" maxWaitMillis="10000"
               username="devuser" password="$Data4Dev" driverClassName="com.mysql.cj.jdbc.driver"
               url="jdbc:mysql://localhost:3306/spring_db?useSSL=false"/>

</Context>

根据对此处另一个问题的回复，我还在Tomcat 9服务器的运行时配置中添加了mysql-connector jar。 enter image description here

我还多次删除了C：\ Users \ user1.m2 \ repository中的存储库，关闭并打开了Eclipse并更新了Maven for project - 没有任何工作，我一直收到同样的错误。

2 个答案:

答案 0 :(得分：0)

这是通过卢克伍德沃德提出的改变来解决的。

答案 1 :(得分：0)

检查在构建路径库中添加的MySQL连接器jar版本。我在构建路径库中添加了旧的jar。通过更改构建路径库中的jar可以解决此问题。

您可能并非如此。因为Maven会自动将jar添加到构建路径库中。

以上答案适用于无需maven手动创建项目的人。

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