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

@@ -29,10 +29,11 @@
 import java.lang.ref.ReferenceQueue;
 import java.lang.ref.SoftReference;
 import java.lang.ref.WeakReference;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
+import java.lang.reflect.InaccessibleObjectException;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.UndeclaredThrowableException;
 import java.lang.reflect.Member;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;

@@ -471,10 +472,11 @@
     private ObjectStreamClass(final Class<?> cl) {
         this.cl = cl;
         name = cl.getName();
         isProxy = Proxy.isProxyClass(cl);
         isEnum = Enum.class.isAssignableFrom(cl);
+        boolean isInlineClass = cl.isInlineClass();
         serializable = Serializable.class.isAssignableFrom(cl);
         externalizable = Externalizable.class.isAssignableFrom(cl);
 
         Class<?> superCl = cl.getSuperclass();
         superDesc = (superCl != null) ? lookup(superCl, false) : null;

@@ -538,10 +540,12 @@
         }
 
         if (deserializeEx == null) {
             if (isEnum) {
                 deserializeEx = new ExceptionInfo(name, "enum type");
+            } else if (isInlineClass && writeReplaceMethod == null) {
+                deserializeEx = new ExceptionInfo(name, "inline class");
             } else if (cons == null) {
                 deserializeEx = new ExceptionInfo(name, "no valid constructor");
             }
         }
         for (int i = 0; i < fields.length; i++) {

@@ -1500,11 +1504,11 @@
         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;
         }
     }
 
     /**