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错误日志： Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-10-06 12:36:22.842 ERROR 11976 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed org.sprin.

这个错误发生在我做一个权限管理项目当中 错误代码 @Override public Results<Void> changePassword(String username, String oldPassword, String newPassword) { // 根据用户名查询 SysUser user = sysUserMapper.selcetUserByUsername(username); // 判断用户是否为空