为什么SQL语句在MySQL中可以输出,在mybatis中不行报错Exception: Cannot find class: ${driver}

org.apache.ibatis.exceptions.PersistenceException:

Error querying database. Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${driver}

The error may exist in cn/fs/dao/UserMapper.xml

The error may involve cn.fs.dao.UserMapper.count

The error occurred while executing a query

Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${driver}

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:107)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:62)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:57)
at cn.fs.test.UserMapperTest.test(UserMapperTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${driver}
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver(UnpooledDataSource.java:195)
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:179)
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:175)
at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:79)
at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:373)
at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:82)
at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:131)
at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:58)
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:271)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:69)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:56)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)
... 28 more

2个回答

配置文件里 你没配驱动

java连接数据库需要对应的数据库驱动。${driver},应该是没有配置驱动

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我用的是MyEclipes8.5,没有配置环境变量,运行.jar文件时,提示cannot find main class(程序在MyEclipes中调试是正确的);补充说明:设置了这个:window->preferences->installed JRES->ADD next->directory选JDK安装目录。请问怎么解决这个问题?rn
SSM链接mysql数据库问题Cannot create JDBC driver of class
八月 23, 2017 4:01:37 下午 org.apache.catalina.core.StandardWrapperValve invokern严重: Servlet.service() for servlet [SpringMVC] in context with path [/liuyg] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: rn### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class 'com.mysql.jdbc.Driver' for connect URL 'jdbc:mysql:127.0.0.1:3306/tjfx'rn### The error may exist in file [D:\tomcat - liuyg\tomcat-7.0.81\webapps\liuyg\WEB-INF\classes\com\Mapping\xt_userMapper.xml]rn### The error may involve com.Dao.xt_userMapper.selectByPrimaryKeyrn### The error occurred while executing a queryrn### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class 'com.mysql.jdbc.Driver' for connect URL 'jdbc:mysql:127.0.0.1:3306/tjfx'] with root causernjava.sql.SQLException: No suitable driverrnrnrnrnrnrnrn配置文件如下rnjdbc.propertiesrn---------rnjdbc.driver=com.mysql.jdbc.Driverrnjdbc.url=jdbc:mysql:127.0.0.1:3306/tjfxrnjdbc.username=rootrnjdbc.password=rootrn#定义初始连接数rnjdbc.initialSize=0rn#定义最大连接数rnjdbc.maxActive=20rn#定义最大空闲rnjdbc.maxIdle=20rn#定义最小空闲rnjdbc.minIdle=1rn#定义最长等待时间rnjdbc.maxWait=600000rn----------rnrnspring-mvc.xmlrn------------rn rn rn rn rn rn rn rn rn text/html;charset=UTF-8 rn rn rn rn rn rn rn rn rn rn rn rnrnrnrnrnrn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn utf-8rn utf-8rn rn rn rn rn rn rn rn rn rn rn rn rn---------------rnrnspring-mybatis.xmlrn------------------rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn----------------
MySQL Cannot load JDBC driver class 'org.gjt.mm.mysql.Driver' 异常
用数据源配置mysql JDBC,Tomcate中server.xml数据源的配置是这样的:rnrnrnrnrnfactoryrnorg.apache.commons.dbcp.BasicDataSourceFactoryrn rnrnusernamernrootrnrnrnpasswordrnrootrnrnrndriverClassNamernorg.gjt.mm.mysql.Driverrnrnrnurlrnjdbc:mysql://localhost/filemanager?user=root&password=root&useUnicode= rn true&characterEncoding=8859_1rnrnrnrnrn为什么启动tomcat的时候,总是提示“Cannot load JDBC driver class 'org.gjt.mm.mysql.Driver'”
救命了,这个sql语句为什么不行?在sqlserver下可以,在sybase下不行。
语句如下:rnSelect CC.*,DD.ZR as ZR1,DD.Q as Q1 from rn(SELECT A.STCDT,B.STNM,A.ZR,A.Q,A.ZRTEND FROM rn ST_RIVER_R A,ST_STINFO_B B WHERE A.STCDT=B.STCDT AND A.YMDHM='2001-07-02 8:0') CC,rn(SELECT A.STCDT,B.STNM,A.ZR,A.Q,A.ZRTEND FROM ST_RIVER_R A,ST_STINFO_B B WHERE A.STCDT=B.STCDT AND A.YMDHM='2001-07-01 8:0') AS DDrnWhere CC.STCDT=DD.STCDT
Mybatis逆向工程中出现Exception getting JDBC Driver的解决方法
在pom.xml中如下位置添加一个mysql-connector-java依赖即可<build> <plugins> <plugin> <dependencies> <!--此处添加一个mysql-connector-java依赖可以防止找不到jdbc Driver--> <dependency> <grou
Cannot find class [com.lee.action.LoginAction] for bean with name '/loginAction'
程序采用struts1+spring2.5+ibatis架构rn就实现一个简单的用户登录功能rn启动Tomcat老实提示找不到LoginAction类rn求解rnstruts.xml中相关配置:rn rn rn rn rnrnspring的配置文件applicationContext.xml中相关配置:rn rn rn rn rn rnrnrn启动服务器时后台提示错误:rnorg.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.lee.action.LoginAction] for bean with name '/loginAction' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.lee.action.LoginActionrnrn找了好久不知道到底哪里出问题了rn求高手指点
spring3 找不到类Cannot find class [org.apache.common.dbcp.BasicDataSource]
我用maven新建了一个小工程,bean工厂是这样的:rn[code=java]rn rn rn rn rn com.mysql.jdbc.Driverrn jdbc:mysql://localhost:3306/testrn rn rn [/code]rn然后提示Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dsBean' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'dataSource' while setting bean property 'ds'; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.common.dbcp.BasicDataSource] for bean with name 'dataSource' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.common.dbcp.BasicDataSourcern是因为:rnCaused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.common.dbcp.BasicDataSource] for bean with name 'dataSource' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.common.dbcp.BasicDataSourcern,于是我就加入了:rn[code=html]rn commons-dbcprn commons-dbcprn 1.4rn [/code]rnmaven就下载了俩包:commongdbcp和commonpool.rn然后运行还是这问题,求熟手、老油条、浪里白条帮我解答,感激不尽。
解决方法:Cannot find the class file for java.lang.Object错误!
今天下载了一个spring版的宠物店,导入Eclipse出现错误:Description Resource Path Location TypernThe project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project jpetstore-project Unknown Java Problemrn,经过网上查找资料及实践认证,以下方法可以解决该问题:rn点击project----->propertys------>Java Build Path -----> Libraries---->Add Libraries----->rnrnJRE System Library------>选第一个workspace default jre-------->finish,这样就OK了!rnrn希望对别的童鞋有帮助,O(∩_∩)O谢谢!rn
cannot find symbol symbol : class ServiceManager,求助!
cannot find symbol symbol : class ServiceManagerrnlocation: package android.os import android.os.ServiceManager;rnrn添加了import android.os.ServiceManager;rnrn为什么还有这样的问题呢 ?rn
cannot create jdbc driver of class ' ' for connect URL 'jdbc:mysql://localhos'
rn rn rn rn rn rnrn在本地运行没有问题,打包成war文件放到云主机的tomcat7下就出现cannot create jdbc driver of class ' ' for connect URL 'jdbc:mysql://localhos:3306/720world'这个错误,lib中也有驱动包mysql-connector-java-5.1.26-bin.jar
SQL语句为什么报错?
Select Str(Round(Detail_Week1_Weight/(BasicInfo_Height*BasicInfo_Height),2)) as Detail_Week1_BMI from tb_Detail where Detail_No = 'LD-001-001'rnrn报错:至少一个参数没有被指定值。
Cannot load JDBC driver class 'com.microsoft.jdbc.sqlserver.SQLServerDriver'
server.xml web.xml等地方都配置好了,直接在tomcat下能运行。但是在jbuilder环境下就是不能运行。把包mssqlserver.jar; msbase.jar ;msutil.jar;commons-collections-3.1.jar;commons-dbcp-1.2.1.jar;commons-pool-1.2.jar;都放进了WEB-INF\lib和Commom\lib下都没有结果,classpath里面也设置了。。。。。rn网上说的所有方法都试过了。rn跪求答案
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