IntelliJ IDEA - java 8 error FIX - Usage of API documented as @since 1.7+ less... (Ctrl+F1)

1. IntelliJ IDEA - Error message:

Usage of API documented as @since 1.7+ less... (Ctrl+F1)
Inspection info: 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.

2. FIX:

FIX in 4 steps:

1. Open Project Structure -> Project
-> Project SDK -> change to java / jdk 8

2. Open Project Structure -> Project
-> Project language level -> change to: "8 - Lambdas, type annotations etc."

3. Open Project Structure -> Modules
-> Language level - change to: "Lambdas, type annotations etc."

4. Open Settings -> Build, Execution, Deployment -> Compiler
-> Java Compiler -> Target bytecode version -> change to: "8"

For me it always solves the problem.

3. FIX with Screenshots

3.1. Screenshot - IntelliJ IDEA - Error message

4. Partial fix with maven plugin

Add this plugin to pom.xml and refresh dependencies

<build>
   <plugins>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.8.0</version>
         <configuration>
            <source>1.8</source>
            <target>1.8</target>
         </configuration>
      </plugin>
   </plugins>
</build>

5. This problem fix applies also to:

• Usage of API documented as @since 1.6+ idea
• Usage of API documented as @since 1.7+ idea
• Usage of API documented as @since 1.8+ idea
• Usage of API documented as @since 11+

6. This problem was seen in:

• IntelliJ IDEA 2015.0.6
• IntelliJ IDEA 2016.3
• IntelliJ IDEA 2017.3
• IntelliJ IDEA 2018.2
• IntelliJ IDEA 2019.1.1
• IntelliJ IDEA 2019.1.2
• IntelliJ IDEA 2019.1.3
• And probably others

Final thought - Java 1.8 should be configured as default.