I haven't done any groovy for a while and when I ran my groovy command I got this:

$ groovy
Error occurred during initialization of VM
java.lang.Error: Could not create SecurityManager
    at java.lang.System.initPhase3(java.base@11.0.2/System.java:2057)
Caused by: java.lang.ClassNotFoundException: allow
    at jdk.internal.loader.BuiltinClassLoader.loadClass(java.base@11.0.2/BuiltinClassLoader.java:583)
    at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(java.base@11.0.2/ClassLoaders.java:178)
    at java.lang.ClassLoader.loadClass(java.base@11.0.2/ClassLoader.java:521)
    at java.lang.Class.forName0(java.base@11.0.2/Native Method)
    at java.lang.Class.forName(java.base@11.0.2/Class.java:398)
    at java.lang.System.initPhase3(java.base@11.0.2/System.java:2042)

I reinstalled groovy with brew reinstall groovy but it didn't make any difference. After a bit of Googling I found a solution.

1. Locate your groovy executable. Mine is in /usr/local/bin/groovy
2. Load it into your favourite editor and modify the security manager name from java.security.manager to java.security.SecurityManager, as follows:

JAVA_HOME="${JAVA_HOME:-/usr/local/opt/openjdk/libexec/openjdk.jdk/Contents/Home}" JAVA_OPTS="$JAVA_OPTS -Djava.security.manager=allow" exec "/usr/local/Cellar/groovy/4.0.1_1/libexec    /bin/groovy"  "$@"

to

JAVA_HOME="${JAVA_HOME:-/usr/local/opt/openjdk/libexec/openjdk.jdk/Contents/Home}" JAVA_OPTS="$JAVA_OPTS -Djava.security.SecurityManager=allow" exec "/usr/local/Cellar/groovy/4.0.1_1/libexec    /bin/groovy"  "$@"

That's it! Do the same for the other groovy supporting programs like: groovyConsole, groovyConsole_completion, groovy_completion, groovyc, groovyc_completion, groovydoc, groovydoc_completion, groovysh, groovysh_completion, also located in /usr/local/bin.