diff -r 7c9e31ffcd9e -r 1a05adae1cc9 lib/Tools/java
--- a/lib/Tools/java	Mon Mar 26 15:38:09 2012 +0200
+++ b/lib/Tools/java	Mon Mar 26 16:25:08 2012 +0200
@@ -6,21 +6,12 @@
 
 CLASSPATH="$(jvmpath "$CLASSPATH")"
 
-JAVA_EXE="$ISABELLE_JDK_HOME/bin/java"
-
-if "$JAVA_EXE" -version >/dev/null 2>/dev/null; then
-  :
-else
-  echo "Bad Java executable: \"$JAVA_EXE\"" >&2
-  exit 2
-fi
-
-if "$JAVA_EXE" -server >/dev/null 2>/dev/null; then
+if isabelle_jdk java -server >/dev/null 2>/dev/null; then
   SERVER="-server"
 else
   SERVER=""
 fi
 
-exec "$JAVA_EXE" -Dfile.encoding=UTF-8 $SERVER \
+exec "$ISABELLE_JDK_HOME/bin/java" -Dfile.encoding=UTF-8 $SERVER \
   "-Djava.ext.dirs=$("$ISABELLE_HOME/src/Tools/JVM/java_ext_dirs")" "$@"