--- a/hotspot/src/share/vm/prims/unsafe.cpp	Thu Apr 21 20:49:11 2016 -0700
+++ b/hotspot/src/share/vm/prims/unsafe.cpp	Fri Apr 22 01:04:00 2016 -0700
@@ -133,13 +133,22 @@
 
 ///// Data in the Java heap.
 
+#define truncate_jboolean(x) ((x) & 1)
+#define truncate_jbyte(x) (x)
+#define truncate_jshort(x) (x)
+#define truncate_jchar(x) (x)
+#define truncate_jint(x) (x)
+#define truncate_jlong(x) (x)
+#define truncate_jfloat(x) (x)
+#define truncate_jdouble(x) (x)
+
 #define GET_FIELD(obj, offset, type_name, v) \
   oop p = JNIHandles::resolve(obj); \
   type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
 
 #define SET_FIELD(obj, offset, type_name, x) \
   oop p = JNIHandles::resolve(obj); \
-  *(type_name*)index_oop_from_field_offset_long(p, offset) = x
+  *(type_name*)index_oop_from_field_offset_long(p, offset) = truncate_##type_name(x)
 
 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
   oop p = JNIHandles::resolve(obj); \
@@ -150,7 +159,7 @@
 
 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
   oop p = JNIHandles::resolve(obj); \
-  OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
+  OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), truncate_##type_name(x));
 
 
 // Get/SetObject must be special-cased, since it works with handles.