1.无效的源发行版

File->Project Structure
选择 Modules ->Dependencies

选择 Modules -> Sources

将Language level 8后,程序成功运行.
2.connot resolve symbol HttpServletRequest
File->Project Structure
选择 Modules ->Dependencies
选择+->library

添加Tomcat8.5.31
File->Project Structure
选择 Modules ->Dependencies
选择 Modules -> Sources
将Language level 8后,程序成功运行.
2.connot resolve symbol HttpServletRequest
File->Project Structure
选择 Modules ->Dependencies
选择+->library
添加Tomcat8.5.31
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