--- /dev/null 2019-07-24 16:12:24.284000000 -0700
+++ new/src/java.base/share/classes/java/io/Serial.java 2019-08-06 12:53:39.985000999 -0700
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.io;
+
+import java.lang.annotation.*;
+
+/**
+ * Indicates that an annotated field or method is part of the {@linkplain
+ * Serializable serialization mechanism} defined by the
+ * Java Object Serialization Specification. This
+ * annotation type is intended to allow compile-time checking of
+ * serialization-related declarations, analogous to the checking
+ * enabled by the {@link java.lang.Override} annotation type to
+ * validate method overriding. {@code Serializable} classes are encouraged to
+ * use @Serial
annotations to help a compiler catch
+ * mis-declared serialization-related fields and methods,
+ * mis-declarations that my otherwise be difficult to detect.
+ *
+ *
Specifically, annotations of this type should be + * applied to serialization-related methods and fields in classes + * declared to be {@code Serializable}. The five serialization-related + * methods are: + * + *
@Serial
annotation is one of the defined serialization-related
+ * methods or fields declared in a meaningful context and issue a warning
+ * if that is not the case.
+ *
+ * It is a semantic error to apply this annotation to other fields or methods, including: + *