diff -r 7c9e31ffcd9e -r 1a05adae1cc9 src/Tools/JVM/java_ext_dirs
--- a/src/Tools/JVM/java_ext_dirs	Mon Mar 26 15:38:09 2012 +0200
+++ b/src/Tools/JVM/java_ext_dirs	Mon Mar 26 16:25:08 2012 +0200
@@ -17,7 +17,7 @@
 
 ## main
 
-exec "$ISABELLE_JDK_HOME/bin/java" \
+isabelle_jdk java \
   -classpath "$(jvmpath "$ISABELLE_HOME/src/Tools/JVM/java_ext_dirs.jar")" \
   isabelle.Java_Ext_Dirs "$(jvmpath "$ISABELLE_HOME/lib/classes/ext")"