strange problems while you are using Intellij IDEA

sometimes strange problems occur if you use IDEA,比如你用sbt或maven编译成功但是用IDEA编译报错报错，

此时一般是项目的字符集和IDEA默认字符集冲突的问题，解决方法就是统一设置，目前咱们项目字符集统一是UTF-8

但是有时候，还会出现一下问题，此时一般是只有少数的errors 多数的警告，改字符集的情况一般是多数的errors(一般上百)

解决办法如下：

$ rm -rf .idea*
$ sbt gen-idea

File/Open in IDEA, answer yes to the question about converting to the new project structure
$ rm -rf projectFilesBackUp  to remove the backup files created during the conversion.

It gets a little annoying... when IDEA imports an SBT project it keeps track of dependency changes and updates stuff on the fly, not so with this work around.