Class JavaLaunchHelper is implemented in two places

Question

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

User · Answer

Same error  I upgrade my Junit and resolve it  org junit jupiter junit-jupiter-api 5 0 0-M6   to  org junit jupiter junit-jupiter-api 5 0 0

User · Answer

Since    this message is harmless    see the  CrazyCoder s answer   a simple and safe workaround is that you can fold this buzzing message in console by IntelliJ IDEA settings     Preferences -  Editor - General - Console -  Fold console lines that contain  Of course  you can use  Find Action     cmd shift A on mac  and type Fold console lines that contain so as to navigate more effectively  add Class JavaLaunchHelper is implemented in both     On my computer  It turns out   LGTM  b      And you can unfold the message to check it again     PS      As of October 2017  this issue is now resolved in jdk1 9 jdk1 8 152 jdk1 7 161   for more info  see the  muttonUp s answer

User · Answer

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 from this 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 Java 8 update 152   If it annoys you or affects your apps in any way  it shouldn t   the workaround for IntelliJ IDEA is to disable idea rt launcher agent by adding idea no launcher true into idea properties  Help   Edit Custom Properties      The workaround will take effect on the next restart of the IDE     I don t recommend disabling IntelliJ IDEA launcher agent  though  It s used for such features as graceful shutdown  Exit button   thread dumps  workarounds a problem with too long command line exceeding OS limits  etc  Losing these features just for the sake of hiding the harmless message is probably not worth it  but it s up to you

User · Answer

I have found the other workaround  to exclude libinstrument dylib from project path  To do so  go to the Preferences -  Build  Execution and Deployment -  Compiler -  Excludes -    and here add file by the path in error message

User · Answer

This was an issue for me years ago and I d previously fixed it in Eclipse by excluding 1 7 from my projects  but it became an issue again for IntelliJ  which I recently installed  I fixed it by    Uninstalling the JDK   cd  Library Java JavaVirtualMachines sudo rm -rf jdk1 8 0 45 jdk    I had jdk1 8 0 45 jdk installed  obviously you should uninstall whichever java version is listed in that folder  The offending files are located in that folder and should be deleted   Downloading and installing JDK 9     Note that the next time you create a new project  or open an existing project  you will need to set the project SDK to point to the new JDK install  You also may still see this bug or have it creep back if you have JDK 1 7 installed in your JavaVirtualMachines folder  which is what I believe happened to me

User · Answer

I am using Intellij Idea 2017 and I got into the same problem  What solved the problem for me was to simply    close the project in intelliJ  File -  New -  project from existing resources  use Import from external model  if any   open the project again

User · Answer

This happened to me when I installed Intellij IDEA 2017  go to menu  Preferences -  Build  Execution  Deployment -  Debugger and disable the option   Force Classic VM for JDK 1 3 x and earlier    This works to me

[java] Class JavaLaunchHelper is implemented in two places

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