idea常见错误

• 错误1：private field ‘xxx‘ is never assigned

按Alt+Enter快捷键，选择第2项
参考：https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070

• 错误2：启动时报错，不能找到主启动类

# 清除缓存并重启
File–>Invalidate Cache/Restart…