Mac版本IntelliJ Idea 2017.1在运行程序时，Console出现红色警告『objc[4163]: Class JavaLaunchHelper is implemented in both XXX』
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objc[4163]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home/bin/java (0x1004784c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x101d824e0). One of the two will be used. Which one is undefined.

但不影响运行结果。stackoverflow上该类问题处理意见如下：

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 benign, there is no negative impact fromthis problem since both copies of that class are identical (compiled from the exact same source). It is purely a cosmetic issue.
The problem is fixed in Java 9 and in Java8 update 152.

If it annoys you or affects your apps in any way, the workaroundfor IntelliJ IDEA is to disable idea_rt launcher agent by addingidea.no.launcher=true into idea.properties (Help | Edit Custom Properties…).

照此方法可以让IntelliJ 不出现红色告警信息。

总的来说，上述警告信息是Java Mac版本的一个Bug，即IDE启动app时被Java代理器触发了这个警告。不过这个警告对程序没有任务伤害，你可以选择忽视它。