idea启动tomcat时Cannot start compilation: the output path is not specified for module "main". Specify the output path in the Project Structure dialog.
解决方法：
file--》Project Structure...--》Project--》Project compiler output:中选择项目，并在后面加一个out
比如我项目UXS-Nielsen-TelecomChannel，Project compiler output:中就填D:\idea_items\UXS-Nielsen-TelecomChannel\out