grails问题Cannot load JDBC driver class 'net.sourceforge.jtds.jdbc.Driver'解决方案

今天使用grails连接sqlserver数据库，数据源也配置了，jar包也放到lib文件夹里了，一输入：grails  run-app，结果傻眼了！

| Error 2016-10-19 16:02:53,562 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.spring
framework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernatePr
operties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.spr
ingframework.beans.factory.BeanCreationException: Error creating bean with name'dialectDetector': Invocation of init method failed; nested exception is org.spr
ingframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'net.sourceforge.jtds.jdbc.Driver'
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.B
eanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'session
Factory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference
to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Er
ror creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hiberna
te.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init me
thod failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apac
he.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'net.sourceforge.jtds.jdbc.Driver'
   Line | Method
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|   138 | run      in java.util.concurrent.FutureTask
|   895 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   918 | run      in     ''
^   662 | run . .  in java.lang.Thread

纳尼！和例子一模一样的配置，看到这一句Cannot load JDBC driver class 'net.sourceforge.jtds.jdbc.Driver'，我以为是jtds包的问题，换了两个jar包，结果不行！重写了一遍代码也是不行，后来，没办法，找度娘！姥姥，也是不靠谱；后来，参照了http://zhidao.baidu.com/link?url=2eIWhOfuzoP9W8rhcls1SxzlpeowLYggVXzNulISUsBG-T_Xt2GiyF5EZuylTL7LzNW53H0NBNRfs7-laMaF2Pd63LWvC7MWvkqTfFcBmQO；

最终执行

E:\grailswork\hellograils>grails clean
| Application cleaned.


E:\grailswork\hellograils>grails compile

E:\grailswork\hellograils>grails run-app

原来grails和java一样啊，有时候也不编译，