I have installed scala, sbt on Mac. When I try to run sbt it gives an error Unrecognized VM option 'CMSClassUnloadingEnabledn-J-Xmx2Gn'. I think there is an issue with JVM but could not find any help for this error.
More error info: Did you mean '(+/-)CMSClassUnloadingEnabled'? Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.
32 Answers
I faced the same issue after I ran the command I ran this command: echo '-J-XX:+CMSClassUnloadingEnabled\n-J-Xmx2G\n' >> /usr/local/etc/sbtopts. It seems the file /usr/local/etc/sbtopts contained both options in same line, separated by \n, i.e. the actual contents of the file were -J-XX:+CMSClassUnloadingEnabled\n-J-Xmx2G\n
The solution was to remove \n by editing this file, and pressing enter key instead, so that the contents of file /usr/local/etc/sbtopts look the way David mentioned in his response.
My guess is that the sbt configuration is confused with regards to line breaks and mangles something like
-J-XX:+CMSClassUnloadingEnabled -J-Xmx2G into one line
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