diff --git a/runtime/bcutil/ClassFileOracle.cpp b/runtime/bcutil/ClassFileOracle.cpp
index 74f3165dcb1..4e84ec162fc 100644
--- a/runtime/bcutil/ClassFileOracle.cpp
+++ b/runtime/bcutil/ClassFileOracle.cpp
@@ -231,8 +231,10 @@ ClassFileOracle::ClassFileOracle(BufferManager *bufferManager, J9CfrClassFile *c
 	_hasNonStaticFields(false),
 	_hasNonEmptyConstructor(false),
 	_preloadAttribute(NULL),
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 	_implicitCreation(NULL),
-#endif /* J9VM_OPT_VALHALLA_VALUE_TYPES */
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 	_recordComponentCount(0),
 	_permittedSubclassesAttribute(NULL),
 	_isSealed(false),
@@ -457,6 +459,11 @@ ClassFileOracle::walkFields()
 			case CFR_ATTRIBUTE_Deprecated:
 				/* Do nothing */
 				break;
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+			case CFR_ATTRIBUTE_NullRestricted:
+				_fieldsInfo[fieldIndex].isNullRestricted = true;
+				break;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 			default:
 				Trc_BCU_ClassFileOracle_walkFields_UnknownAttribute((U_32)attrib->tag, (U_32)getUTF8Length(attrib->nameIndex), getUTF8Data(attrib->nameIndex), attrib->length);
 				break;
@@ -615,11 +622,13 @@ ClassFileOracle::walkAttributes()
 			}
 			break;
 		}
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 		case CFR_ATTRIBUTE_ImplicitCreation: {
 			_implicitCreation = (J9CfrAttributeImplicitCreation *)attrib;
 			break;
 		}
-#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 #if JAVA_SPEC_VERSION >= 11
 		case CFR_ATTRIBUTE_NestMembers:
 			/* ignore CFR_ATTRIBUTE_NestMembers for hidden classes, as the nest members never know the name of hidden classes */
diff --git a/runtime/bcutil/ClassFileOracle.hpp b/runtime/bcutil/ClassFileOracle.hpp
index a82a2138431..a1ef6ae693b 100644
--- a/runtime/bcutil/ClassFileOracle.hpp
+++ b/runtime/bcutil/ClassFileOracle.hpp
@@ -46,9 +46,6 @@
  * */
 #define UTF8_INDEX_FROM_CLASS_INDEX(cp, cpIndex)  ((U_16)((cpIndex == 0)? 0 : cp[cpIndex].slot1))
 
-#define IMPLICIT_CREATION_FLAGS_DEFAULT 1
-#define IMPLICIT_CREATION_FLAGS_NON_ATOMIC 2
-
 class BufferManager;
 class ConstantPoolMap;
 class ROMClassCreationContext;
@@ -68,6 +65,9 @@ class ClassFileOracle
 		J9CfrAttributeRuntimeVisibleAnnotations *annotationsAttribute;
 		J9CfrAttributeRuntimeVisibleTypeAnnotations *typeAnnotationsAttribute;
 		bool isFieldContended;
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+		bool isNullRestricted;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 	};
 
 	struct StackMapFrameInfo
@@ -345,7 +345,9 @@ class FieldIterator
 		bool hasAnnotation() const { return _fieldsInfo[_index].annotationsAttribute != NULL;}
 		bool hasTypeAnnotation() const { return _fieldsInfo[_index].typeAnnotationsAttribute != NULL;}
 		bool isFieldContended() const { return _fieldsInfo[_index].isFieldContended; }
-
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+		bool isNullRestricted() const { return _fieldsInfo[_index].isNullRestricted; }
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 		U_32 getConstantValueSlot1() const { return _classFile->constantPool[getConstantValueConstantPoolIndex()].slot1; }
 		U_32 getConstantValueSlot2() const { return _classFile->constantPool[getConstantValueConstantPoolIndex()].slot2; }
@@ -1020,10 +1022,6 @@ class RecordComponentIterator
 	bool needsIdentityFlag() const { return _isIdentityFlagNeeded; }
 	bool hasIdentityFlagSet() const { return _hasIdentityFlagSet; }
 	bool isValueType() const { return _isValueType; }
-	bool hasImplicitCreation() const { return NULL != _implicitCreation; }
-	U_16 getImplicitCreationFlags() const { return hasImplicitCreation() ? _implicitCreation->implicitCreationFlags : 0; }
-	bool isImplicitCreationHasDefaultValue() const { return J9_ARE_ALL_BITS_SET(getImplicitCreationFlags(), IMPLICIT_CREATION_FLAGS_DEFAULT); }
-	bool isImplicitCreationNonAtomic() const { return J9_ARE_ALL_BITS_SET(getImplicitCreationFlags(), IMPLICIT_CREATION_FLAGS_NON_ATOMIC); }
 	bool hasPreloadClasses() const { return NULL != _preloadAttribute; }
 	U_16 getPreloadClassCount() const { return  hasPreloadClasses() ? _preloadAttribute->numberOfClasses : 0; }
 
@@ -1035,7 +1033,16 @@ class RecordComponentIterator
 		}
 		return result;
 	}
-#endif /* J9VM_OPT_VALHALLA_VALUE_TYPES */
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+	#define IMPLICIT_CREATION_FLAGS_DEFAULT 1
+	#define IMPLICIT_CREATION_FLAGS_NON_ATOMIC 2
+
+	bool hasImplicitCreation() const { return NULL != _implicitCreation; }
+	U_16 getImplicitCreationFlags() const { return hasImplicitCreation() ? _implicitCreation->implicitCreationFlags : 0; }
+	bool isImplicitCreationHasDefaultValue() const { return J9_ARE_ALL_BITS_SET(getImplicitCreationFlags(), IMPLICIT_CREATION_FLAGS_DEFAULT); }
+	bool isImplicitCreationNonAtomic() const { return J9_ARE_ALL_BITS_SET(getImplicitCreationFlags(), IMPLICIT_CREATION_FLAGS_NON_ATOMIC); }
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 	U_16 getPermittedSubclassesClassNameAtIndex(U_16 index) const {
 		U_16 result = 0;
@@ -1165,9 +1172,11 @@ class RecordComponentIterator
 	J9CfrAttributeBootstrapMethods *_bootstrapMethodsAttribute;
 	J9CfrAttributePermittedSubclasses *_permittedSubclassesAttribute;
 #if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
-	J9CfrAttributeImplicitCreation *_implicitCreation;
 	J9CfrAttributePreload *_preloadAttribute;
 #endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+	J9CfrAttributeImplicitCreation *_implicitCreation;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 #if JAVA_SPEC_VERSION >= 11
 	J9CfrAttributeNestMembers *_nestMembers;
 #endif /* JAVA_SPEC_VERSION >= 11 */
diff --git a/runtime/bcutil/ROMClassBuilder.cpp b/runtime/bcutil/ROMClassBuilder.cpp
index de4b027f93c..7ecc59ece08 100644
--- a/runtime/bcutil/ROMClassBuilder.cpp
+++ b/runtime/bcutil/ROMClassBuilder.cpp
@@ -1337,14 +1337,14 @@ ROMClassBuilder::computeExtraModifiers(ClassFileOracle *classFileOracle, ROMClas
 		modifiers |= J9AccSealed;
 	}
 
-#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 	if (classFileOracle->isImplicitCreationNonAtomic()) {
 		modifiers |= J9AccImplicitCreateNonAtomic;
 	}
 	if (classFileOracle->isImplicitCreationHasDefaultValue()) {
 		modifiers |= J9AccImplicitCreateHasDefaultValue;
 	}
-#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 	return modifiers;
 }
diff --git a/runtime/bcutil/ROMClassWriter.cpp b/runtime/bcutil/ROMClassWriter.cpp
index fe25d6706be..ad8aaf318d1 100644
--- a/runtime/bcutil/ROMClassWriter.cpp
+++ b/runtime/bcutil/ROMClassWriter.cpp
@@ -651,6 +651,11 @@ ROMClassWriter::writeFields(Cursor *cursor, bool markAndCountOnly)
 			if (iterator.hasTypeAnnotation()) {
 				modifiers |= J9FieldFlagHasTypeAnnotations;
 			}
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+			if (iterator.isNullRestricted()) {
+				modifiers |= J9FieldFlagIsNullRestricted;
+			}
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 			cursor->writeU32(modifiers, Cursor::GENERIC);
 		}
diff --git a/runtime/bcutil/attrlookup.gperf b/runtime/bcutil/attrlookup.gperf
index 3343182bf08..24386de5d12 100644
--- a/runtime/bcutil/attrlookup.gperf
+++ b/runtime/bcutil/attrlookup.gperf
@@ -24,7 +24,10 @@
  * This file is the input to the gperf utility for generating a perfect
  * hash table of attribute names, which is used by attributeTagFor().
  *
- * To generate attrlookup.h, use the following command-line with gperf 3.0.4:
+ * Types generated by gperf cause compiler issues in the OpenJ9 Windows builds,
+ * use the existing types.
+ *
+ * To generate attrlookup.h, use the following command-line with the latest version of gperf:
  *
  *   gperf -CD -t --output-file=attrlookup.h attrlookup.gperf
  *
@@ -74,3 +77,4 @@ Record, CFR_ATTRIBUTE_Record, CFR_ATTRIBUTE_Record
 PermittedSubclasses, CFR_ATTRIBUTE_PermittedSubclasses, CFR_ATTRIBUTE_PermittedSubclasses
 ImplicitCreation, CFR_ATTRIBUTE_ImplicitCreation, CFR_ATTRIBUTE_ImplicitCreation
 Preload, CFR_ATTRIBUTE_Preload, CFR_ATTRIBUTE_Preload
+NullRestricted, CFR_ATTRIBUTE_NullRestricted, CFR_ATTRIBUTE_NullRestricted
diff --git a/runtime/bcutil/attrlookup.h b/runtime/bcutil/attrlookup.h
index fef190bc22a..ff2b0825641 100644
--- a/runtime/bcutil/attrlookup.h
+++ b/runtime/bcutil/attrlookup.h
@@ -20,7 +20,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
  *******************************************************************************/
 
-/* ANSI-C code produced by gperf version 3.0.4 */
+/* ANSI-C code produced by gperf version 3.1 */
 /* Command-line: gperf -CD -t --output-file=attrlookup.h attrlookup.gperf  */
 /* Computed positions: -k'2' */
 
@@ -48,10 +48,10 @@
       && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
       && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
 /* The character set is not based on ISO-646.  */
-#error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gnu-gperf@gnu.org>."
+#error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gperf@gnu.org>."
 #endif
 
-#line 39 "attrlookup.gperf"
+#line 42 "attrlookup.gperf"
 struct AttribType
 {
 	const char *name;
@@ -59,7 +59,7 @@ struct AttribType
 	U_8 strippedAttribCode;
 };
 
-#define TOTAL_KEYWORDS 30
+#define TOTAL_KEYWORDS 31
 #define MIN_WORD_LENGTH 4
 #define MAX_WORD_LENGTH 36
 #define MIN_HASH_VALUE 4
@@ -73,8 +73,8 @@ __inline
 inline
 #endif
 #endif
-static unsigned int
-attributeHash (register const char *str, register unsigned int len)
+static size_t
+attributeHash (register const char *str, register size_t len)
 {
   static const unsigned char asso_values[] =
     {
@@ -115,85 +115,87 @@ __attribute__ ((__gnu_inline__))
 #endif
 #endif
 const struct AttribType *
-lookupKnownAttribute (register const char *str, register unsigned int len)
+lookupKnownAttribute (register const char *str, register size_t len)
 {
   static const struct AttribType wordlist[] =
     {
-#line 47 "attrlookup.gperf"
+#line 50 "attrlookup.gperf"
       {"Code", CFR_ATTRIBUTE_Code, CFR_ATTRIBUTE_Code},
-#line 76 "attrlookup.gperf"
+#line 79 "attrlookup.gperf"
       {"Preload", CFR_ATTRIBUTE_Preload, CFR_ATTRIBUTE_Preload},
-#line 49 "attrlookup.gperf"
+#line 52 "attrlookup.gperf"
       {"Synthetic", CFR_ATTRIBUTE_Synthetic, CFR_ATTRIBUTE_Synthetic},
-#line 53 "attrlookup.gperf"
+#line 56 "attrlookup.gperf"
       {"SourceFile", CFR_ATTRIBUTE_SourceFile, CFR_ATTRIBUTE_SourceFile},
-#line 54 "attrlookup.gperf"
+#line 57 "attrlookup.gperf"
       {"InnerClasses", CFR_ATTRIBUTE_InnerClasses, CFR_ATTRIBUTE_InnerClasses},
-#line 55 "attrlookup.gperf"
+#line 58 "attrlookup.gperf"
       {"ConstantValue", CFR_ATTRIBUTE_ConstantValue, CFR_ATTRIBUTE_ConstantValue},
-#line 57 "attrlookup.gperf"
+#line 80 "attrlookup.gperf"
+      {"NullRestricted", CFR_ATTRIBUTE_NullRestricted, CFR_ATTRIBUTE_NullRestricted},
+#line 60 "attrlookup.gperf"
       {"EnclosingMethod", CFR_ATTRIBUTE_EnclosingMethod, CFR_ATTRIBUTE_EnclosingMethod},
-#line 59 "attrlookup.gperf"
+#line 62 "attrlookup.gperf"
       {"BootstrapMethods", CFR_ATTRIBUTE_BootstrapMethods, CFR_ATTRIBUTE_BootstrapMethods},
-#line 60 "attrlookup.gperf"
+#line 63 "attrlookup.gperf"
       {"AnnotationDefault", CFR_ATTRIBUTE_AnnotationDefault, CFR_ATTRIBUTE_AnnotationDefault},
-#line 61 "attrlookup.gperf"
+#line 64 "attrlookup.gperf"
       {"LocalVariableTable", CFR_ATTRIBUTE_LocalVariableTable, CFR_ATTRIBUTE_StrippedLocalVariableTable},
-#line 62 "attrlookup.gperf"
+#line 65 "attrlookup.gperf"
       {"SourceDebugExtension", CFR_ATTRIBUTE_SourceDebugExtension, CFR_ATTRIBUTE_StrippedSourceDebugExtension},
-#line 75 "attrlookup.gperf"
+#line 78 "attrlookup.gperf"
       {"ImplicitCreation", CFR_ATTRIBUTE_ImplicitCreation, CFR_ATTRIBUTE_ImplicitCreation},
-#line 63 "attrlookup.gperf"
+#line 66 "attrlookup.gperf"
       {"LocalVariableTypeTable", CFR_ATTRIBUTE_LocalVariableTypeTable, CFR_ATTRIBUTE_StrippedLocalVariableTypeTable},
-#line 48 "attrlookup.gperf"
+#line 51 "attrlookup.gperf"
       {"StackMap", CFR_ATTRIBUTE_StackMap, CFR_ATTRIBUTE_StackMap},
-#line 50 "attrlookup.gperf"
+#line 53 "attrlookup.gperf"
       {"Signature", CFR_ATTRIBUTE_Signature, CFR_ATTRIBUTE_Signature},
-#line 64 "attrlookup.gperf"
+#line 67 "attrlookup.gperf"
       {"RuntimeVisibleAnnotations", CFR_ATTRIBUTE_RuntimeVisibleAnnotations, CFR_ATTRIBUTE_RuntimeVisibleAnnotations},
-#line 65 "attrlookup.gperf"
+#line 68 "attrlookup.gperf"
       {"RuntimeInvisibleAnnotations", CFR_ATTRIBUTE_RuntimeInvisibleAnnotations, CFR_ATTRIBUTE_RuntimeInvisibleAnnotations},
-#line 56 "attrlookup.gperf"
+#line 59 "attrlookup.gperf"
       {"StackMapTable", CFR_ATTRIBUTE_StackMapTable, CFR_ATTRIBUTE_StackMapTable},
-#line 66 "attrlookup.gperf"
+#line 69 "attrlookup.gperf"
       {"RuntimeVisibleTypeAnnotations", CFR_ATTRIBUTE_RuntimeVisibleTypeAnnotations, CFR_ATTRIBUTE_RuntimeVisibleTypeAnnotations},
-#line 58 "attrlookup.gperf"
+#line 61 "attrlookup.gperf"
       {"LineNumberTable", CFR_ATTRIBUTE_LineNumberTable, CFR_ATTRIBUTE_StrippedLineNumberTable},
-#line 67 "attrlookup.gperf"
+#line 70 "attrlookup.gperf"
       {"RuntimeInvisibleTypeAnnotations", CFR_ATTRIBUTE_RuntimeInvisibleTypeAnnotations, CFR_ATTRIBUTE_RuntimeInvisibleTypeAnnotations},
-#line 68 "attrlookup.gperf"
+#line 71 "attrlookup.gperf"
       {"RuntimeVisibleParameterAnnotations", CFR_ATTRIBUTE_RuntimeVisibleParameterAnnotations, CFR_ATTRIBUTE_RuntimeVisibleParameterAnnotations},
-#line 52 "attrlookup.gperf"
+#line 55 "attrlookup.gperf"
       {"Exceptions", CFR_ATTRIBUTE_Exceptions, CFR_ATTRIBUTE_Exceptions},
-#line 69 "attrlookup.gperf"
+#line 72 "attrlookup.gperf"
       {"RuntimeInvisibleParameterAnnotations", CFR_ATTRIBUTE_RuntimeInvisibleParameterAnnotations, CFR_ATTRIBUTE_RuntimeInvisibleParameterAnnotations},
-#line 73 "attrlookup.gperf"
+#line 76 "attrlookup.gperf"
       {"Record", CFR_ATTRIBUTE_Record, CFR_ATTRIBUTE_Record},
-#line 72 "attrlookup.gperf"
+#line 75 "attrlookup.gperf"
       {"NestHost", CFR_ATTRIBUTE_NestHost, CFR_ATTRIBUTE_NestHost},
-#line 51 "attrlookup.gperf"
+#line 54 "attrlookup.gperf"
       {"Deprecated", CFR_ATTRIBUTE_Deprecated, CFR_ATTRIBUTE_Deprecated},
-#line 71 "attrlookup.gperf"
+#line 74 "attrlookup.gperf"
       {"NestMembers", CFR_ATTRIBUTE_NestMembers, CFR_ATTRIBUTE_NestMembers},
-#line 70 "attrlookup.gperf"
+#line 73 "attrlookup.gperf"
       {"MethodParameters", CFR_ATTRIBUTE_MethodParameters, CFR_ATTRIBUTE_MethodParameters},
-#line 74 "attrlookup.gperf"
+#line 77 "attrlookup.gperf"
       {"PermittedSubclasses", CFR_ATTRIBUTE_PermittedSubclasses, CFR_ATTRIBUTE_PermittedSubclasses}
     };
 
   static const signed char lookup[] =
     {
       -1, -1, -1, -1,  0, -1, -1,  1, -1,  2,  3, -1,  4,  5,
-      -1,  6,  7,  8,  9, -1, 10, 11, 12, 13, 14, 15, -1, 16,
-      17, 18, 19, 20, -1, -1, 21, 22, 23, 24, -1, 25, -1, 26,
-      27, -1, -1, -1, -1, 28, -1, -1, 29
+       6,  7,  8,  9, 10, -1, 11, 12, 13, 14, 15, 16, -1, 17,
+      18, 19, 20, 21, -1, -1, 22, 23, 24, 25, -1, 26, -1, 27,
+      28, -1, -1, -1, -1, 29, -1, -1, 30
     };
 
   if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
     {
-      register int key = attributeHash (str, len);
+      register size_t key = attributeHash (str, len);
 
-      if (key <= MAX_HASH_VALUE && key >= 0)
+      if (key <= MAX_HASH_VALUE)
         {
           register int index = lookup[key];
 
diff --git a/runtime/bcutil/cfreader.c b/runtime/bcutil/cfreader.c
index 3262460c04b..c4b4e43bff0 100644
--- a/runtime/bcutil/cfreader.c
+++ b/runtime/bcutil/cfreader.c
@@ -110,7 +110,7 @@ utf8Equal(J9CfrConstantPoolInfo* utf8, char* string, UDATA length)
 static U_8 
 attributeTagFor(J9CfrConstantPoolInfo *utf8, BOOLEAN stripDebugAttributes)
 {
-	const struct AttribType *attribType = lookupKnownAttribute((const char *)utf8->bytes, (unsigned int)utf8->slot1);
+	const struct AttribType *attribType = lookupKnownAttribute((const char *)utf8->bytes, (size_t)utf8->slot1);
 
 	if (NULL != attribType) {
 		return (stripDebugAttributes ? attribType->strippedAttribCode : attribType->attribCode);
@@ -148,8 +148,10 @@ readAttributes(J9CfrClassFile * classfile, J9CfrAttribute *** pAttributes, U_32
 	J9CfrAttributePermittedSubclasses *permittedSubclasses;
 #if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
 	J9CfrAttributePreload *preload;
-	J9CfrAttributeImplicitCreation *implicitCreation;
 #endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+	J9CfrAttributeImplicitCreation *implicitCreation;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 #if JAVA_SPEC_VERSION >= 11
 	J9CfrAttributeNestHost *nestHost;
 	J9CfrAttributeNestMembers *nestMembers;
@@ -174,8 +176,11 @@ readAttributes(J9CfrClassFile * classfile, J9CfrAttribute *** pAttributes, U_32
 	BOOLEAN permittedSubclassesAttributeRead = FALSE;
 #if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
 	BOOLEAN preloadAttributeRead = FALSE;
-	BOOLEAN implicitCreationAttributeRead = FALSE;
 #endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
+	BOOLEAN implicitCreationAttributeRead = FALSE;
+	BOOLEAN nullRestrictedAttributeRead = FALSE;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 #if JAVA_SPEC_VERSION >= 11
 	BOOLEAN nestAttributeRead = FALSE;
 #endif /* JAVA_SPEC_VERSION >= 11 */
@@ -953,7 +958,8 @@ readAttributes(J9CfrClassFile * classfile, J9CfrAttribute *** pAttributes, U_32
 				NEXT_U16(preload->classes[j], index);
 			}
 			break;
-
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 		case CFR_ATTRIBUTE_ImplicitCreation:
 			/* JVMS: There may be at most one ImplicitCreation attribute in the attributes table of a ClassFile structure... */
 			if (implicitCreationAttributeRead) {
@@ -972,7 +978,23 @@ readAttributes(J9CfrClassFile * classfile, J9CfrAttribute *** pAttributes, U_32
 			NEXT_U16(implicitCreation->implicitCreationFlags, index);
 
 			break;
-#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+	case CFR_ATTRIBUTE_NullRestricted:
+		/* JVMS: There must be no more than one NullRestricted attribute in the attributes table of a field_info structure */
+		if (nullRestrictedAttributeRead) {
+			errorCode = J9NLS_CFR_ERR_MULTIPLE_NULLRESTRICTED_ATTRIBUTES__ID;
+			offset = address;
+			goto _errorFound;
+		}
+		nullRestrictedAttributeRead = TRUE;
+
+		if (!ALLOC_CAST(attrib, J9CfrAttributeNullRestricted, J9CfrAttribute)) {
+			return -2;
+		}
+		if (length != 0) {
+			errorCode = J9NLS_CFR_ERR_NULLRESTRICTED_ATTRIBUTES_LENGTH_IS_ZERO__ID;
+		}
+		break;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 #if JAVA_SPEC_VERSION >= 11
 		case CFR_ATTRIBUTE_NestHost:
@@ -2607,7 +2629,8 @@ checkAttributes(J9PortLibrary* portLib, J9CfrClassFile* classfile, J9CfrAttribut
 				}
 			}
 			break;
-
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 		case CFR_ATTRIBUTE_ImplicitCreation:
 			value = ((J9CfrAttributeImplicitCreation*)attrib)->nameIndex;
 			if ((0 == value) || (value >= cpCount)) {
@@ -2621,7 +2644,15 @@ checkAttributes(J9PortLibrary* portLib, J9CfrClassFile* classfile, J9CfrAttribut
 				break;
 			}
 			break;
-#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+		case CFR_ATTRIBUTE_NullRestricted:
+			value = ((J9CfrAttributeNullRestricted*)attrib)->nameIndex;
+			if ((0 == value) || (value >= cpCount)) {
+				errorCode = J9NLS_CFR_ERR_BAD_INDEX__ID;
+				goto _errorFound;
+				break;
+			}
+			break;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 #if JAVA_SPEC_VERSION >= 11
 		case CFR_ATTRIBUTE_NestHost:
diff --git a/runtime/nls/cfre/cfrerr.nls b/runtime/nls/cfre/cfrerr.nls
index 1758088f463..64da2e506f3 100644
--- a/runtime/nls/cfre/cfrerr.nls
+++ b/runtime/nls/cfre/cfrerr.nls
@@ -1734,3 +1734,19 @@ J9NLS_CFR_ERR_IMPLICITCREATION_NAME_NOT_UTF8.explanation=Please consult the Java
 J9NLS_CFR_ERR_IMPLICITCREATION_NAME_NOT_UTF8.system_action=The JVM will throw a verification or classloading related exception such as java.lang.ClassFormatError.
 J9NLS_CFR_ERR_IMPLICITCREATION_NAME_NOT_UTF8.user_response=Contact the provider of the classfile for a corrected version.
 # END NON-TRANSLATABLE
+
+# NullRestricted is not translatable
+J9NLS_CFR_ERR_MULTIPLE_NULLRESTRICTED_ATTRIBUTES=Multiple NullRestricted attributes present
+# START NON-TRANSLATABLE
+J9NLS_CFR_ERR_MULTIPLE_NULLRESTRICTED_ATTRIBUTES.explanation=Please consult the Java Virtual Machine Specification for a detailed explanation.
+J9NLS_CFR_ERR_MULTIPLE_NULLRESTRICTED_ATTRIBUTES.system_action=The JVM will throw a verification or classloading related exception such as java.lang.ClassFormatError.
+J9NLS_CFR_ERR_MULTIPLE_NULLRESTRICTED_ATTRIBUTES.user_response=Contact the provider of the classfile for a corrected version.
+# END NON-TRANSLATABLE
+
+# NullRestricted is not translatable
+J9NLS_CFR_ERR_NULLRESTRICTED_ATTRIBUTES_LENGTH_IS_ZERO=NullRestricted attribute_length item must be zero
+# START NON-TRANSLATABLE
+J9NLS_CFR_ERR_NULLRESTRICTED_ATTRIBUTES_LENGTH_IS_ZERO.explanation=Please consult the Java Virtual Machine Specification for a detailed explanation.
+J9NLS_CFR_ERR_NULLRESTRICTED_ATTRIBUTES_LENGTH_IS_ZERO.system_action=The JVM will throw a verification or classloading related exception such as java.lang.ClassFormatError.
+J9NLS_CFR_ERR_NULLRESTRICTED_ATTRIBUTES_LENGTH_IS_ZERO.user_response=Contact the provider of the classfile for a corrected version.
+# END NON-TRANSLATABLE
diff --git a/runtime/oti/cfr.h b/runtime/oti/cfr.h
index 4b21f34c917..79205e1ce52 100644
--- a/runtime/oti/cfr.h
+++ b/runtime/oti/cfr.h
@@ -243,6 +243,7 @@ typedef struct J9CfrAttribute {
 #define CFR_ATTRIBUTE_PermittedSubclasses 28
 #define CFR_ATTRIBUTE_Preload 29
 #define CFR_ATTRIBUTE_ImplicitCreation 30
+#define CFR_ATTRIBUTE_NullRestricted 31
 #define CFR_ATTRIBUTE_StrippedLocalVariableTypeTable  122
 #define CFR_ATTRIBUTE_StrippedSourceDebugExtension  123
 #define CFR_ATTRIBUTE_StrippedInnerClasses  124
@@ -542,7 +543,8 @@ typedef struct J9CfrAttributePreload {
     U_16 numberOfClasses;
     U_16* classes;
 } J9CfrAttributePreload;
-
+#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 typedef struct J9CfrAttributeImplicitCreation {
     U_8 tag;
     U_16 nameIndex;
@@ -551,7 +553,13 @@ typedef struct J9CfrAttributeImplicitCreation {
     U_16 implicitCreationFlags;
 } J9CfrAttributeImplicitCreation;
 
-#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
+typedef struct J9CfrAttributeNullRestricted {
+    U_8 tag;
+    U_16 nameIndex;
+    U_32 length;
+    UDATA romAddress;
+} J9CfrAttributeNullRestricted;
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 /* @ddr_namespace: map_to_type=J9CfrConstantPoolInfo */
 
diff --git a/runtime/oti/j9nonbuilder.h b/runtime/oti/j9nonbuilder.h
index 1188fe6b9e7..58f79cd16b1 100644
--- a/runtime/oti/j9nonbuilder.h
+++ b/runtime/oti/j9nonbuilder.h
@@ -100,7 +100,7 @@
 #define J9FieldFlagIsContended 0x10000000
 #define J9FieldFlagObject 0x20000
 #define J9FieldFlagFlattened 0x1000000
-#define J9FieldFlagUnused_2000000 0x2000000
+#define J9FieldFlagIsNullRestricted 0x2000000
 #define J9FieldFlagUnused_4000000 0x4000000
 #define J9FieldFlagPutResolved 0x8000000
 #define J9FieldFlagResolved 0x80000000
diff --git a/runtime/vm/createramclass.cpp b/runtime/vm/createramclass.cpp
index 4081d1ad9de..35bb5d34754 100644
--- a/runtime/vm/createramclass.cpp
+++ b/runtime/vm/createramclass.cpp
@@ -2300,6 +2300,7 @@ internalCreateRAMClassDone(J9VMThread *vmThread, J9ClassLoader *classLoader, J9C
 			}
 		}
 
+#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
 		if (J9ROMCLASS_ALLOWS_NON_ATOMIC_CREATION(romClass)) {
 			classFlags |= J9ClassAllowsNonAtomicCreation;
 		}
@@ -2307,6 +2308,7 @@ internalCreateRAMClassDone(J9VMThread *vmThread, J9ClassLoader *classLoader, J9C
 			/* J9ClassIsValueType is being reused here intentionally */
 			classFlags |= J9ClassIsValueType;
 		}
+#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
 
 		if (J9ROMCLASS_IS_VALUE(romClass)) {
 			classFlags |= J9ClassIsValueType;