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

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@@ -28,10 +28,11 @@
  import java.lang.invoke.MethodHandle;
  import java.lang.invoke.MethodHandles;
  import java.lang.invoke.MethodType;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Field;
+ import java.lang.reflect.InaccessibleObjectException;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.RecordComponent;
  import java.lang.reflect.UndeclaredThrowableException;
  import java.lang.reflect.Member;
  import java.lang.reflect.Method;

@@ -441,10 +442,12 @@
          }
  
          if (deserializeEx == null) {
              if (isEnum) {
                  deserializeEx = new ExceptionInfo(name, "enum type");
+             } else if (cl.isValue() && writeReplaceMethod == null) {
+                 deserializeEx = new ExceptionInfo(name, cl.isPrimitiveClass() ? "primitive class" : "value class");
              } else if (cons == null && !isRecord) {
                  deserializeEx = new ExceptionInfo(name, "no valid constructor");
              }
          }
          if (isRecord && canonicalCtr == null) {

@@ -1428,11 +1431,11 @@
          try {
              Constructor<?> cons = cl.getDeclaredConstructor((Class<?>[]) null);
              cons.setAccessible(true);
              return ((cons.getModifiers() & Modifier.PUBLIC) != 0) ?
                  cons : null;
-         } catch (NoSuchMethodException ex) {
+         } catch (NoSuchMethodException | InaccessibleObjectException ex) {
              return null;
          }
      }
  
      /**

@@ -1757,12 +1760,14 @@
                  String[] ifaceNames = new String[interfaces.length];
                  for (int i = 0; i < interfaces.length; i++) {
                      ifaceNames[i] = interfaces[i].getName();
                  }
                  Arrays.sort(ifaceNames);
+                 // Skip IdentityObject to keep the computed SVUID the same.
                  for (int i = 0; i < ifaceNames.length; i++) {
-                     dout.writeUTF(ifaceNames[i]);
+                     if (!"java.lang.IdentityObject".equals(ifaceNames[i]))
+                         dout.writeUTF(ifaceNames[i]);
                  }
              }
  
              Field[] fields = cl.getDeclaredFields();
              MemberSignature[] fieldSigs = new MemberSignature[fields.length];
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