diff -r 60b6c759134f -r e1b4b14ded58 lib/Tools/java
--- a/lib/Tools/java	Fri Oct 05 17:49:10 2018 +0200
+++ b/lib/Tools/java	Fri Oct 05 23:49:12 2018 +0200
@@ -10,5 +10,4 @@
 unset CLASSPATH
 
 isabelle_java java "${JAVA_ARGS[@]}" \
-  "-Djava.ext.dirs=$(platform_path "$ISABELLE_JDK_HOME/jre/lib/ext")" \
   -classpath "$(platform_path "$ISABELLE_CLASSPATH")" "$@"