Unrecognized VM option 'CMSClassUnloadingEnabled' when running ./sbt.sh-CodePudding

I am trying to learn Scala through the Creative Scala guide. However, I get an error when I try to run on terminal the command below that is on page 12.

Now change to the directory we just created and run SBT.
cd creative-scala-template
./sbt.sh

The error I get is:

Unrecognized VM option 'CMSClassUnloadingEnabled'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

It seems that the problem is with sbt?

I tried to follow the top comment in this other question, that says to go to the folder /usr/local/etc/sbtopts and do some changes, but my folder /usr/local/ is empty.

Can anyone tells me what I am likely doing wrong, please?

By doing java -version I get:

openjdk version "18.0.2" 2022-07-19
OpenJDK Runtime Environment (build 18.0.2 9-61)
OpenJDK 64-Bit Server VM (build 18.0.2 9-61, mixed mode, sharing)

And sbt -version gets me:

sbt version in this project: 1.7.1
sbt script version: 1.7.1

After the solution by Tim, I am now getting a different error when running ./sbt.sh. Does anyone knows how to fix this?

java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release
    at java.base/java.lang.System.setSecurityManager(System.java:416)
    at sbt.TrapExit$.installManager(TrapExit.scala:53)
    at sbt.StandardMain$.runManaged(Main.scala:128)
    at sbt.xMain.run(Main.scala:89)
    at xsbt.boot.Launch$$anonfun$run$1.apply(Launch.scala:109)
    at xsbt.boot.Launch$.withContextLoader(Launch.scala:128)
    at xsbt.boot.Launch$.run(Launch.scala:109)
    at xsbt.boot.Launch$$anonfun$apply$1.apply(Launch.scala:35)
    at xsbt.boot.Launch$.launch(Launch.scala:117)
    at xsbt.boot.Launch$.apply(Launch.scala:18)
    at xsbt.boot.Boot$.runImpl(Boot.scala:56)
    at xsbt.boot.Boot$.main(Boot.scala:18)
    at xsbt.boot.Boot.main(Boot.scala)
Error during sbt execution: java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release

CodePudding user response：

In this case, the option is defined in the sbt.sh file itself, included in the template project. This option was removed in Java 14 and later, and the guide you are using was developed with an earlier Java version.

You can edit this file and delete the text -XX: CMSClassUnloadingEnabled from it.

All of the other options currently in that file are still supported as of Java 18.

The resulting command will look like this:

java -Xmx3g -Xms1g -XX: TieredCompilation -XX:ReservedCodeCacheSize=256m -XX: UseNUMA -XX: UseParallelGC -jar sbt-launch.jar "$@"