absorb final CLASSPATH as well, such that tools might provide that by elementary means, without the "classpath" shell function (e.g. kodkodi/nitpick);
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke Java within the Isabelle environment
declare -a JAVA_ARGS; eval "JAVA_ARGS=($ISABELLE_JAVA_SYSTEM_OPTIONS)"
[ -n "$CLASSPATH" ] && classpath "$CLASSPATH"
unset CLASSPATH
isabelle_jdk java "${JAVA_ARGS[@]}" \
-classpath "$(jvmpath "$ISABELLE_CLASSPATH")" "$@"