Change the initialization of interface compliant with specs

As per Java Language Spec, java.lang.Object is not supertype of
Java interface, the proposed change is to skip the initialization
of java.lang.Object as the supertype of the interface and
initialize its super interfaces instead.

Fixes: #24153

Author: lzhou2025

runtime/vm/ClassInitialization.cpp

@@ -709,47 +709,50 @@ classInitStateMachine(J9VMThread *currentThread, J9Class *clazz, J9ClassInitStat
 				J9ITable *superITable = NULL;
 				J9ITable *firstITable = NULL;
 				J9ITable *iTable = NULL;
-				if (NULL != superclazz) {
-					Trc_VM_classInitStateMachine_initSuperclass(currentThread);
-					PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, initializationLock);
-					classInitStateMachine(currentThread, superclazz, J9_CLASS_INIT_INITIALIZED);
-					initializationLock = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
-					clazz = VM_VMHelpers::currentClass(clazz);
-					superclazz = VM_VMHelpers::getSuperclass(clazz);
-					if (VM_VMHelpers::exceptionPending(currentThread)) {
-						goto initFailed;
+
+				/* Do not initialize the superclass java.lang.Object of interfaces */
+				if (!J9ROMCLASS_IS_INTERFACE(clazz->romClass)) {
+					if (NULL != superclazz) {
+						Trc_VM_classInitStateMachine_initSuperclass(currentThread);
+						PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, initializationLock);
+						classInitStateMachine(currentThread, superclazz, J9_CLASS_INIT_INITIALIZED);
+						initializationLock = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
+						clazz = VM_VMHelpers::currentClass(clazz);
+						superclazz = VM_VMHelpers::getSuperclass(clazz);
+						if (VM_VMHelpers::exceptionPending(currentThread)) {
+							goto initFailed;
+						}
+						superITable = (J9ITable*)superclazz->iTable;
 					}
-					superITable = (J9ITable*)superclazz->iTable;
 				}
-				/* Do not initialize the superinterfaces of interfaces */
-				if (!J9_ARE_ANY_BITS_SET(clazz->romClass->modifiers, J9AccInterface)) {
-					/* Initialize super-interfaces with non-static, non-abstract methods */
-					Trc_VM_classInitStateMachine_initSuperInterfacesWithNonStaticNonAbstractMethods(currentThread, clazz);
-					/* Don't traverse all iTables - indirect super-interfaces are initialized with the superclass */
-					firstITable = (J9ITable*)clazz->iTable;
-					iTable = firstITable;
-					while (iTable != superITable) {
-						J9Class *interfaceClazz = iTable->interfaceClass;
-						if (J9_ARE_ANY_BITS_SET(interfaceClazz->romClass->extraModifiers, J9AccClassHasNonStaticNonAbstractMethods)) {
-							PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, initializationLock);
-							classInitStateMachine(currentThread, interfaceClazz, J9_CLASS_INIT_INITIALIZED);
-							initializationLock = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
-							clazz = VM_VMHelpers::currentClass(clazz);
-							if (VM_VMHelpers::exceptionPending(currentThread)) {
-								goto initFailed;
-							}
-							/* Ensure that we are still traversing a valid iTable chain */
-							if (firstITable != (J9ITable*)clazz->iTable) {
-								iTable = (J9ITable*)clazz->iTable;
-								if (NULL != superclazz) {
-									superclazz = VM_VMHelpers::getSuperclass(clazz);
-									superITable = (J9ITable*)superclazz->iTable;
-								}
-								continue;
+
+				/* Initialize super-interfaces with non-static, non-abstract methods */
+				Trc_VM_classInitStateMachine_initSuperInterfacesWithNonStaticNonAbstractMethods(currentThread, clazz);
+				/* Don't traverse all iTables - indirect super-interfaces are initialized with the superclass */
+				firstITable = (J9ITable*)clazz->iTable;
+				iTable = firstITable;
+				while (iTable != superITable) {
+					J9Class *interfaceClazz = iTable->interfaceClass;
+
+					if (J9_ARE_ANY_BITS_SET(interfaceClazz->romClass->extraModifiers, J9AccClassHasNonStaticNonAbstractMethods)) {
+						PUSH_OBJECT_IN_SPECIAL_FRAME(currentThread, initializationLock);
+						classInitStateMachine(currentThread, interfaceClazz, J9_CLASS_INIT_INITIALIZED);
+						initializationLock = POP_OBJECT_IN_SPECIAL_FRAME(currentThread);
+						clazz = VM_VMHelpers::currentClass(clazz);
+						if (VM_VMHelpers::exceptionPending(currentThread)) {
+							goto initFailed;
+						}
+						/* Ensure that we are still traversing a valid iTable chain */
+						if (firstITable != (J9ITable*)clazz->iTable) {
+							iTable = (J9ITable*)clazz->iTable;
+							if (NULL != superclazz) {
+								superclazz = VM_VMHelpers::getSuperclass(clazz);
+								superITable = (J9ITable*)superclazz->iTable;
 							}
+							continue;
 						}
-						iTable = iTable->next;
 					}
+					iTable = iTable->next;
 				}
 
 #if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)