Intellij - Unable to use newer Java 8 classes - Error : “Usage of API documented as @since 1.6+..”

Question

I\'m trying to use a java.lang.function.Function in my java 8 code base, but i keep getting the following error in Intellij.

Usage of API

Answer 1

If you are using maven then Add below line in your configuration pom.xml file and then reimport or build it from maven.

    
        
            org.apache.maven.plugins
            maven-compiler-plugin
            3.3
            
                1.8
                1.8
            
        
    

Else select java compiler and Language Level from below path.

File > Project Structure > Project Settings > Modules > your Module name > Sources > Language Level > choose the one which you need.

Change Language level from here :-