錯誤提示： The project was not built since its build path is incomplete. Cannot find the class file for j

錯誤提示：
The project was not built since its build path is incomplete. Cannot find the class file for java.util.Map Entry.FixthebuildpaththentrybuildingthisprojectThetypejava.util.Map Entry. Fix the build path then try building this project The type java.util.MapEntry cannot be resolved. It is indirectly referenced from required .class files HibernateSessionFactory.java
原因：項目不適用jdk1.8，改成MyEclipse內建的1.6就行了。tomcat還是原來的1.8。（更改預設的jdk，然後重啟）