Error:java: invalid source release: 8 in Intellij. What does it mean?

Question

Im trying to compile some code in I\'m using Intellij Ultimate 13.1.4, but I get the following error and I have no idea what it means:

Information:Using java         


        

Answer 1

For Gradle users having this issues, if nothing above helps this is what solved my problem - apply this declarations in your build.gradle files:

targetCompatibility = 1.6 //or 1.7;1.8 and so on
sourceCompatibility = 1.6 //or 1.7;1.8 and so on

Problem solved!