simplified JVM startup, based on stronger assumptions about the Java version provided as Isabelle component;
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke Java within the Isabelle environment
CLASSPATH="$(jvmpath "$CLASSPATH")"
isabelle_jdk java -Dfile.encoding=UTF-8 -server \
"-Djava.ext.dirs=$(jvmpath "$ISABELLE_JAVA_EXT:$ISABELLE_HOME/lib/classes/ext")" "$@"