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diff --git a/java/src/test/java/com/google/protobuf/test_extra_interfaces.proto b/java/src/test/java/com/google/protobuf/test_extra_interfaces.proto
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: Darick Tong (darick@google.com)
+
+package protobuf_unittest;
+
+message Proto1 {
+  option experimental_java_message_interface =
+      "com.google.protobuf.ExtraInterfaces.HasBoolValue";
+
+  option experimental_java_interface_extends =
+      "com.google.protobuf.ExtraInterfaces.HasByteValue";
+
+  option experimental_java_message_interface =
+      "com.google.protobuf.ExtraInterfaces.HasStringValue<Proto1>";
+
+  option experimental_java_builder_interface =
+      "com.google.protobuf.ExtraInterfaces.HasStringValueBuilder"
+      "<Proto1, Builder>";
+
+  optional string string_value = 1;
+  optional bool bool_value = 2;
+  optional bytes byte_value = 3;
+  optional int32 int_value = 4;
+}
+
+message Proto2 {
+  option experimental_java_message_interface =
+      "com.google.protobuf.ExtraInterfaces.HasBoolValue";
+
+  optional bool bool_value = 1;
+}