Class JavaLaunchHelper is implemented in two places

Issue:

Today I upgraded my Intellij Idea on macOS Sierra, and now, when I run apps in console I have this error:

objc[3648]: Class JavaLaunchHelper is implemented in both 
/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/bin/java (0x10d19c4c0) and 
/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x10ea194e0). 
One of the two will be used. Which one is undefined.

Answers:

You can find all the details here:

IDEA-170117 "objc: Class JavaLaunchHelper is implemented in both ..." warning in Run consoles
It's the old bug in Java on Mac that got triggered by the Java Agent being used by the IDE when starting the app. This message is harmless and is safe to ignore. Oracle developer's comment:

The message is be