Web項目與Tomcat的7 Tomcat服務器

Question

我得到的默認Vaadin代碼下面的錯誤上部署

Multiple markers at this line 
    - The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files 
    - The type java.util.function.Consumer cannot be resolved. It is indirectly referenced from 
    required .class files 
    - The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files 

Answer 1

java.util.function.Consumer似乎是從Java 8到來。
您是否使用JDK 8部署了應用程序？