How do I increase Groovy's JVM Heap Size? -

On web claims

I should be able to give xx max to groovy but it just gives me java .io FileNotFoundException When that -Xxx file can not be found, tell me to designate some variables JAVA_OPTS but how do I do this? And how do I know that it works?

$ export JAVA_OPTS = "$ JAVA_OPTS -Xmx64M" $ Groovy