IntelliJ IDEA启动项目报错:Error:java: System Java Compiler was not found in classpath:

IntelliJ IDEA启动项目错误:Error:java: System Java Compiler was not found in classpath。本人花了太多时间才解决。现整理一下简洁有效的方式。
1.针对java8:
Settings > java compiler > 将javac 改成 eclipse;IntelliJ IDEA启动项目报错:Error:java: System Java Compiler was not found in classpath:
2.(本人亲测)java7:
a.设置jdk版本;
IntelliJ IDEA启动项目报错:Error:java: System Java Compiler was not found in classpath:
IntelliJ IDEA启动项目报错:Error:java: System Java Compiler was not found in classpath:
b.将图中勾勾取消!!!!!!!
IntelliJ IDEA启动项目报错:Error:java: System Java Compiler was not found in classpath: