部署在tomcat服務器上的Web項目

Question

我在Tomcat 7的默認Vaadin代碼上收到以下錯誤。

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似乎來自Java 8 。
您是否使用JDK 8部署了該應用程序？