idea启动报错：Access denied for user 'root '@'192.168.100.XXX' (using password: YES)

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sysUserMapper' defined in file [D:\workspace\b2b_refactor\b2b_refactor\target\classes\com\zj\web\system\mapper\SysUserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gctxSqlSessionFactory' defined in class path resource [com/zj/config/DataSourceConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'gctxSqlSessionFactory' threw exception; nested exception is com.baomidou.mybatisplus.exceptions.MybatisPlusException: Error: GlobalConfigUtils setMetaData Fail ! Cause:java.sql.SQLException: Access denied for user 'root '@'192.168.100.206' (using password: YES)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1357)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1249)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
... 149 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'gctxSqlSessionFactory' defined in class path resource [com/zj/config/DataSourceConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'gctxSqlSessionFactory' threw exception; nested exception is com.baomidou.mybatisplus.exceptions.MybatisPlusException: Error: GlobalConfigUtils setMetaData Fail ! Cause:java.sql.SQLException: Access denied for user 'root '@'192.168.100.XXX' (using password: YES)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1342)
... 160 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'gctxSqlSessionFactory' threw exception; nested exception is com.baomidou.mybatisplus.exceptions.MybatisPlusException: Error: GlobalConfigUtils setMetaData Fail ! Cause:java.sql.SQLException: Access denied for user 'root '@'192.168.100.206' (using password: YES)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 172 common frames omitted
Caused by: com.baomidou.mybatisplus.exceptions.MybatisPlusException: Error: GlobalConfigUtils setMetaData Fail ! Cause:java.sql.SQLException: Access denied for user 'root '@'192.168.100.206' (using password: YES)
at com.baomidou.mybatisplus.toolkit.GlobalConfigUtils.setMetaData(GlobalConfigUtils.java:196)
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:560)
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.afterPropertiesSet(MybatisSqlSessionFactoryBean.java:385)
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.getObject(MybatisSqlSessionFactoryBean.java:608)
at com.zj.config.DataSourceConfig.gctxSqlSessionFactory(DataSourceConfig.java:63)
at com.zj.config.DataSourceConfig$$EnhancerBySpringCGLIB$$4aa4d4ab.CGLIB$gctxSqlSessionFactory$2(<generated>)
at com.zj.config.DataSourceConfig$$EnhancerBySpringCGLIB$$4aa4d4ab$$FastClassBySpringCGLIB$$39462b28.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358)
at com.zj.config.DataSourceConfig$$EnhancerBySpringCGLIB$$4aa4d4ab.gctxSqlSessionFactory(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 173 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:64866', transport: 'socket'

Process finished with exit code 1

解决方法：

网上建议的解决方案都是，

　这是因为当前用户没有访问mysql的权限导致的在mysql中执行：grant all privileges on *.* to root@'%' identified by 'root';

就可以访问了。

　尝试了好多遍：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
   flush privileges;

都不合适。。。。。

在配置文件中，

spring.datasource.gctx.driverClassName = com.mysql.jdbc.Driver
spring.datasource.gctx.url= jdbc:mysql://192.168.100.XXX:3306/b2b_test?useUnicode=yes&characterEncoding=UTF-8&useSSL=false
spring.datasource.gctx.username = root 
spring.datasource.gctx.password = 123456
配置文件第四行，root后面加了一个空格，粗心大意导致的问题，

最终，去掉空格，问题解决。

原文地址：https://www.cnblogs.com/bruce-young/p/10101243.html