In this line of java-default-options, we set the JVM parameter -XX:ParallelGCThreads based on a calculated "core_limit" value, the number of CPU cores the container has been assigned.

https://github.com/jboss-container-images/openjdk/blob/develop/modules/jvm/bash/artifacts/opt/jboss/container/java/jvm/java-default-options#L127

The JVM , by default, will do the same thing, so we do not need to specify this. Also this does not make sense to specify if the GC is changed from ParallelGC to another by the user. Therefore, we should remove that parameter from the script.