IntelliJ won't accept Java8 and diamonds at the end of List/Map
I'm using the latest JDK and everywhere from project creation to now everything is set to Java8 or SDK 8.
Still, intelliJ gives me this issue:
The red lamp tells me to change to Java7.
This is my project settings: 
and this is the Modules section: 
As you can see; I specifically changed it from the SDK default to java 8 when I got the error, but no result.
The compiler settings look like this: 
I'm on a macbook and the intelliJ is the community version. Does anyone know why this is happening and how I fix it?
Try to run the project, if this is your error message:
Then I suggest you have a little look into your pom -file.
This project was built using the intelliJ maven project setting, and it was missing this lovely line of code:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
IntelliJ doesn't (at least in my case) generate the version in the pom (despite that I picked all the settings for it).
I tried specifying the compiler version in the plugin too, to no avail. Have you tried invalidating the cache? It's File -> Invalidate Caches/Restart... . I would probably restart as well for good measure.