less authentic SHA1.digest: trust Scala side on blobs and avoid re-calculation via Foreign Language Interface, which might be a cause of problems;
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke Scala compiler within the Isabelle environment
isabelle_admin_build jars || exit $?
isabelle_scala scalac -Dfile.encoding=UTF-8 \
-classpath "$(jvmpath "$ISABELLE_CLASSPATH")" "$@"