Java 8: Class JavaLaunchHelper is implemented in both

Question

I'm trying to launch Cassandra and I'm running into an issue with JavaLaunchHelper being located in two places. I'm running Java 8. Here's the exact error:

objc[413]: Class JavaLaunchHelper is implemented in both
/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java and 
/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/libinstrument.dylib. 
One of the two will be used. Which one is undefined.

Found a similar question for Java 7:

Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined

What's the best way to go about solving this?

score 16 · Answer 1 · edited May 23 '17 at 11:33

16

This is a bug in the JDK and is still not fixed (as of 8u25). See more info here.

edited May 23 '17 at 11:33

Community

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answered Nov 06 '14 at 16:32

J.R. Garcia

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What is the solution? – Shajeel Afzal Jun 09 '15 at 02:55
@ShajeelAfzal Simply believe that both versions of the code are kept the same by oracle and ignore the message. – Gangnus Jun 15 '16 at 06:53

score 1 · Answer 2 · answered May 13 '14 at 04:28

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Shouldn't be a problem, just an annoying message. But Cassandra hasn't been verified against java 8 yet, so you may see some strangeness.

answered May 13 '14 at 04:28

Zanson

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You are right that it isn't a problem, but this is not an answer... It also most definitely is not a Cassandra problem. – DCKing Jun 24 '14 at 19:54
@DCKing I'll select a better answer if someone offers one up. – user3181113 Jul 03 '14 at 03:17

score 1 · Answer 3 · answered Feb 21 '17 at 15:20

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You must go to Preferences/Build, Execution, Deployment/Debugger and disable the option: "Force Classic VM for JDK 1.3.x and earlier" This works for me

answered Feb 21 '17 at 15:20

David Figueroa

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maybe it was a coincidence on your side, because it has no effect on me – andrei Mar 09 '17 at 16:31

Andrew · Answer 4 · 2017-02-13T19:59:04.957

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put lines to files ~/.bashrc (or/and ~/.zshrc) and save

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home 
export PATH=$JAVA_HOME/bin:$PATH

and then restart (logout/login) terminal (IDE)

edited Feb 13 '17 at 19:59

answered Oct 04 '16 at 21:08

Andrew

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This doesn't work for me. Both are set and the warning still occurs with 1.8.0_111 in both zsh and bash. – Spanky Quigman Nov 01 '16 at 02:32
I'm running jdk1.8.0_102 and I still get the error even after trying this solution as well – MichaelF Feb 13 '17 at 00:35
@MichaelF Check if you're using java version you want with terminal command "java -version" – Andrew Feb 13 '17 at 15:41
@Andrey Yes, it is running the right version. I just continually get this now, even if I am running with your fixes to the bashrc – MichaelF Feb 13 '17 at 18:41

score 0 · Answer 5 · answered Mar 27 '17 at 03:01

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Two steps fix this problem:

1.Navigate to /Library/Internet Plug-Ins and remove the JavaAppletPlugin.plugin directory.

2.Navigate to /Library/PreferencePanes and remove JavaControlPanel.prefpane.

Essentially, do one thing: uninstall jre !

answered Mar 27 '17 at 03:01

Charles He

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Java 8: Class JavaLaunchHelper is implemented in both

5 Answers5