Web项目与Tomcat的7 Tomcat服务器

Question

我得到的默认Vaadin代码下面的错误上部署

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似乎是从Java 8到来。
您是否使用JDK 8部署了应用程序？