Introduction to errors that occur when upgrading IntelliJ Idea on Mac

Upgraded IntelliJ Idea on Mac today

After upgrading to 2017.01, when running the program, the following red warning appears:

objc[20556]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home/bin/java (0x108ada4c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x108bb64e0). One of the two will be used. Which one is undefined.

stackoverflow said this is a java on Mac bug, but this does not affect normal programming work.

Solution:

In idea, go to Help > Edit Custom Properties...

Modify idea.properties and add the following content:

# custom IntelliJ IDEA properties
idea_rt
idea.no.launcher=true

Restart idea

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