Cannot create JDBC driver of class 'org.gjt.mm.mysql.Driver' for connect URL 'null'

Posted 2023-04-22

做Struts1.2时出错，配好数据源后Tomcat5.5一启动就报错：
Cannot create JDBC driver of class 'org.gjt.mm.mysql.Driver' for connect URL 'null'。

其中struts-config.xml内容如下：
<data-sources>
<data-source key="jdbc/mysql" type="org.apache.commons.dbcp.BasicDataSource">
<set-property property="driverClassName" value="org.gjt.mm.mysql.Driver"/>
<set-property property="url" value="jdbc:mysql://localhost:3306/field"/>
<set-property property="username" value="root"/>
<set-property property="password" value="123456"/>
<set-property property="minCount" value="10"/>
<set-property property="maxCount" value="20"/>
<set-property property="description" value="mysql"/>
<set-property property="readOnly" value="false"/>
<set-property property="autoCommit" value="true"/>
<set-property property="loginTimeout" value=""/>
</data-source>
</data-sources>
这是其中调用的代码：
public class loginAction extends Action

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception
ActionErrors errors = new ActionErrors();
boolean isValid=false;

isValid = valid(request,(loginActionForm)form);

if(isValid)
return mapping.findForward("success");
else
errors.add("NameOrPassError", new ActionMessage("NameOrPassError"));
return mapping.findForward("error");



private boolean valid(HttpServletRequest request,loginActionForm loginForm)
DataSource ds = null;
Connection conn = null;
boolean b = false;

try
ds = getDataSource(request,"jdbc/mysql");
conn = ds.getConnection();
String username = loginForm.getUsername();
String password = loginForm.getPassword();
String sqlStr = new String("select * from user where username=? and password=?");
PreparedStatement preSQLSelect = conn.prepareStatement(sqlStr,ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);

username = new String(username.getBytes("ISO-8859-1"));
password = new String(password.getBytes("ISO-8859-1"));
preSQLSelect.setString(1,username);
preSQLSelect.setString(2,password);
ResultSet rs = preSQLSelect.executeQuery();

if(rs.next())
b = true;
request.getSession().setAttribute("userID",rs.getString("userID"));
request.getSession().setAttribute("username",rs.getString("userName"));
request.getSession().setAttribute("password",rs.getString("password"));


rs.close();
preSQLSelect.close();
conn.close();

catch (SQLException e)
e.printStackTrace();
catch (UnsupportedEncodingException e)
e.printStackTrace();


return b;



请大家帮帮忙

确定你的mysql驱动放在项目中了么？

1)启动Tomcat服务器，打开浏览器，输入http://localhost:8080/admin（其中localhost是名称服务器或称为主机），
进入管理界面的登陆页面，这时候请输入原来安装时要求输入的用户名和密码，登陆到管理界面，

2)选择Resources－Data sources进入配置数据源界面，选择
Data Source Actions －>选择Create New Data Source,进入配置详细信息界面
主要内容例如下：
JNDI Name: ->jdbc/mysql
Data Source URL ->jdbc:mysql://localhost:3306/test
JDBC Driver Class-> org.gjt.mm.mysql.Driver
3)修改\conf\Catalina\localhost目录下建立一个xml文件,名称为你所发布的web应用的名称．xml,(如testpool.xml)打开添加内容如下:
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource
name="jdbc/mysql"
type="javax.sql.DataSource"
password="123456"
driverClassName="org.gjt.mm.mysql.Driver"
maxIdle="2"
maxWait="50"
username="root"
url="jdbc:mysql://localhost:3306/test"
maxActive="4"/>

</Context>
内容同conf/server.xml中<GlobalNamingResources>
<Resource
name="jdbc/mysql"
type="javax.sql.DataSource"
password="123456"
driverClassName="org.gjt.mm.mysql.Driver"
maxIdle="2"
maxWait="50"
username="root"
url="jdbc:mysql://localhost:3306/test"
maxActive="4"/>
</GlobalNamingResources>

少了这一步会报错：Cannot create JDBC driver of class '' for connect URL 'null'
4)修改web.xml

打开%TOMCAT_HOME%\conf\web.xml或yourwebapp/web-inf/web.xml,添加以下内容：
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/mysql</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
注意res-ref-name填写的内容要与在上文提到的JNDI Name名称一致。
到这里，配置工作就基本完成了!

5)引用JNDI时用"java:comp/env/jdbc/mysql";
建立文件测试 test.jsp：
<%@page contentType="text/html;charset=utf-8" %>
<%@page import="java.sql.*" %>
<%@page import="javax.sql.*" %>
<%@page import="javax.naming.*" %>
<html>
<head>
<title>Tomcat连接池测试</title>
</head>
<body>
<%
Context ctx=new InitialContext();
Connection conn=null;
DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/mysql");
conn=ds.getConnection();
Statement stmt=conn.createStatement(ResultSet.CONCUR_READ_ONLY,ResultSet.CONCUR_UPDATABLE);
ResultSet rs=stmt.executeQuery("select * from testexample");
while(rs.next())
out.println(rs.getInt(1));
out.println(rs.getString(2));
out.println(rs.getString(3));

out.println("数据库操作成功！");
rs.close();
stmt.close();
conn.close();

%>
</body>
</html> 参考技术A 换个驱动的jar包，用这个mysql-connector-java-5.0.8-bin.jar

这个jar包是mysql官方的驱动jar包

驱动的名是 com.mysql.jdbc.Driver

Cannot load driver class: com.mysql.cj.jdbc.Driver

"C:\\Program Files\\Java\\jdk1.8.0_181\\bin\\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:61441,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-Dmanagement.endpoints.jmx.exposure.include=*" -javaagent:C:\\Users\\Lucas\\AppData\\Local\\JetBrains\\IntelliJIdea2022.3\\captureAgent\\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\charsets.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\deploy.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\ext\\access-bridge-64.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\ext\\cldrdata.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\ext\\dnsns.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\ext\\jaccess.jar;C:\\Program Files\\Java\\jdk1.8.0_181\\jre\\lib\\ext\\jfxrt.jar;C:\\Program 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Files\\JetBrains\\IntelliJ IDEA 2022.3.1\\lib\\idea_rt.jar" com.example.springbootdemo.SpringbootDemoApplication
Connected to the target VM, address: '127.0.0.1:61441', transport: 'socket'

  .   ____          _            __ _ _
 /\\\\ / ___'_ __ _ _(_)_ __  __ _ \\ \\ \\ \\
( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\
 \\\\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::               (v2.6.11)

2023-01-11 08:57:00.918  INFO 91072 --- [           main] c.e.s.SpringbootDemoApplication          : Starting SpringbootDemoApplication using Java 1.8.0_181 on DESKTOP-JSP3CM3 with PID 91072 (C:\\tfy\\code\\springbootDemo\\springbootDemo\\target\\classes started by Lucas in C:\\tfy\\code\\springbootDemo\\springbootDemo)
2023-01-11 08:57:00.921  INFO 91072 --- [           main] c.e.s.SpringbootDemoApplication          : No active profile set, falling back to 1 default profile: "default"
2023-01-11 08:57:01.616  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode
2023-01-11 08:57:01.617  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JDBC repositories in DEFAULT mode.
2023-01-11 08:57:01.628  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 5 ms. Found 0 JDBC repository interfaces.
2023-01-11 08:57:01.639  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode
2023-01-11 08:57:01.639  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2023-01-11 08:57:01.649  INFO 91072 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 2 ms. Found 0 JPA repository interfaces.
2023-01-11 08:57:02.220  INFO 91072 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-01-11 08:57:02.228  INFO 91072 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-01-11 08:57:02.228  INFO 91072 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.65]
2023-01-11 08:57:02.398  INFO 91072 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-01-11 08:57:02.398  INFO 91072 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1432 ms
2023-01-11 08:57:02.464  WARN 91072 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceScriptDatabaseInitializer' defined in class path resource [org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]: Unsatisfied dependency expressed through method 'dataSourceScriptDatabaseInitializer' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
2023-01-11 08:57:02.466  INFO 91072 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2023-01-11 08:57:02.488  INFO 91072 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-01-11 08:57:02.511 ERROR 91072 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceScriptDatabaseInitializer' defined in class path resource [org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]: Unsatisfied dependency expressed through method 'dataSourceScriptDatabaseInitializer' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1154) ~[spring-context-5.3.22.jar:5.3.22]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:908) ~[spring-context-5.3.22.jar:5.3.22]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.22.jar:5.3.22]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.11.jar:2.6.11]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:745) [spring-boot-2.6.11.jar:2.6.11]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:420) [spring-boot-2.6.11.jar:2.6.11]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.6.11.jar:2.6.11]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1317) [spring-boot-2.6.11.jar:2.6.11]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) [spring-boot-2.6.11.jar:2.6.11]
    at com.example.springbootdemo.SpringbootDemoApplication.main(SpringbootDemoApplication.java:10) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.22.jar:5.3.22]
    ... 21 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.22.jar:5.3.22]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.22.jar:5.3.22]
    ... 35 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.cj.jdbc.Driver
    at org.springframework.util.Assert.state(Assert.java:97) ~[spring-core-5.3.22.jar:5.3.22]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:241) ~[spring-boot-autoconfigure-2.6.11.jar:2.6.11]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:193) ~[spring-boot-autoconfigure-2.6.11.jar:2.6.11]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:48) ~[spring-boot-autoconfigure-2.6.11.jar:2.6.11]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:90) ~[spring-boot-autoconfigure-2.6.11.jar:2.6.11]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.22.jar:5.3.22]
    ... 36 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:61441', transport: 'socket'

Process finished with exit code 1