diff -r 51560e392e1b -r 34fac6fb9b03 lib/Tools/scala
--- a/lib/Tools/scala	Thu Aug 23 20:49:00 2012 +0200
+++ b/lib/Tools/scala	Thu Aug 23 21:23:14 2012 +0200
@@ -8,4 +8,4 @@
 
 CLASSPATH="$(jvmpath "$CLASSPATH")"
 isabelle_scala scala -Dfile.encoding=UTF-8 \
-  "-Djava.ext.dirs=$("$ISABELLE_HOME/src/Tools/JVM/java_ext_dirs")" "$@"
+  "-Djava.ext.dirs=$(jvmpath "$ISABELLE_JAVA_EXT:$ISABELLE_HOME/lib/classes/ext")" "$@"