“Usage of API documented as @sin

在使用jdk1.8IntStream的时候报

Usage of API documented as @since 1.8+ 
This inspection finds all usages of methods that have @since tag in their documentation. 
This may be useful when development is performed under newer SDK version as the target platform for production.

Maven项目每个Module都有单独的pom.xml，如果不在pom.xml中进行配置，则默认将Module的Language Level设置为5。所以要在pom.xml文件中添加插件进行配置。

<plugin>      
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.6.0</version>
   <configuration>
      <source>1.8</source>
      <target>1.8</target>
   </configuration>
</plugin>