8281295: Prototype serialization/deserialization using Unsafe.

src/java.base/share/classes/java/io/ObjectInputStream.java

@@ -2283,7 +2283,6 @@ private Object readOrdinaryObject(boolean unshared)
             if (!unshared)
                 handles.setObject(passHandle, obj);
         } else if (desc.isExternalizable()) {
-            assert obj != null;
             if (desc.isValue()) {
                 throw new NotSerializableException("Externalizable not valid for value class "
                         + cl.getName());
@@ -2293,14 +2292,13 @@ private Object readOrdinaryObject(boolean unshared)
             readExternalData((Externalizable) obj, desc);
         } else if (desc.isValue()) {
             // For value objects, read the fields and finish the buffer before publishing the ref
-            assert obj != null;
+            assert obj != null : "obj == null: " + desc;
             readSerialData(obj, desc);
             obj = desc.finishValue(obj);
             if (!unshared)
                 handles.setObject(passHandle, obj);
         } else {
             // For all other objects, publish the ref and then read the data
-            assert obj != null;
             if (!unshared)
                 handles.setObject(passHandle, obj);
             readSerialData(obj, desc);

src/java.base/share/classes/java/io/ObjectStreamClass.java

@@ -450,9 +450,7 @@ public Void run() {
         if (deserializeEx == null) {
             if (isEnum) {
                 deserializeEx = new ExceptionInfo(name, "enum type");
-            } else if (cl.isValue() && writeReplaceMethod == null) {
-                deserializeEx = new ExceptionInfo(name, "value class");
-            } else if (cons == null && !isRecord) {
+            } else if (cons == null && !(isRecord | isValue)) {
                 deserializeEx = new ExceptionInfo(name, "no valid constructor");
             }
         }

test/jdk/java/io/Serializable/valueObjects/ValueSerialization.java

@@ -24,7 +24,6 @@
 /*
  * @test
  * @summary ValueSerialization support of value classes
- * @compile -XDenablePrimitiveClasses Point.java Line.java NonFlattenValue.java Serialization.java
  * @run testng/othervm ValueSerialization
  */