The javalaunchhelper class is implemented in two places

• Java

Today, I upgraded my IntelliJ idea on MacOS Sierra. Now, this error occurs when I run the application in the console:

Solution

You can find all the details here:

>Warning in idea-170117 "objc: class javalaunchhelper implemented in two..." run console

This is the 0700 old bug in Java on MAC used by the IDE when starting the application This message is harmless and can be safely ignored Oracle developer comments:

Problem is fixed in Java 9 and Java 8 update 152

If it annoys you or affects your application in any way (it shouldn't), the solution of IntelliJ idea is through in idea Add idea. In properties No. launcher = true to disable idea_ RT launcher agent (help | edit custom properties..) The solution will take effect the next time you restart the IDE

However, I do not recommend disabling the IntelliJ idea launcher agent It is used for normal shutdown (exit button), thread dump, solution is too long, command line exceeds operating system limit, etc It may not be worth losing these features just to hide harmless messages, but it's up to you

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