more explicit jvm_name;

--- a/src/Pure/System/gui_setup.scala	Wed Dec 22 11:52:57 2010 +0100
+++ b/src/Pure/System/gui_setup.scala	Wed Dec 22 12:05:17 2010 +0100
@@ -39,7 +39,7 @@
     // values
     if (Platform.is_windows)
       text.append("Cygwin root: " + Cygwin.check_root() + "\n")
-    text.append("JVM name: " + System.getProperty("java.vm.name") + "\n")
+    text.append("JVM name: " + Platform.jvm_name + "\n")
     text.append("JVM platform: " + Platform.jvm_platform + "\n")
     try {
       val isabelle_system = new Isabelle_System

--- a/src/Pure/System/platform.scala	Wed Dec 22 11:52:57 2010 +0100
+++ b/src/Pure/System/platform.scala	Wed Dec 22 12:05:17 2010 +0100
@@ -53,6 +53,12 @@
   }
 
 
+  /* JVM name */
+
+  val jvm_name: String = java.lang.System.getProperty("java.vm.name")
+  val is_hotspot: Boolean = jvm_name.startsWith("Java HotSpot")
+
+
   /* Swing look-and-feel */
 
   private def find_laf(name: String): Option[String] =