src/Tools/JVM/java_ext_dirs

ISABELLE_JDK_HOME settings variable points to JDK with javac and jar (not just JRE);
update for prospective jdk1.7.x component;

#!/usr/bin/env bash
#
# Author: Makarius
#
# Augment Java extension directories.

## diagnostics

function fail()
{
  echo "$1" >&2
  exit 2
}

[ -n "$ISABELLE_HOME" ] || fail "Missing Isabelle settings environment"


## main

exec "$ISABELLE_JDK_HOME/bin/java" \
  -classpath "$(jvmpath "$ISABELLE_HOME/src/Tools/JVM/java_ext_dirs.jar")" \
  isabelle.Java_Ext_Dirs "$(jvmpath "$ISABELLE_HOME/lib/classes/ext")"