From 6ce63a4a5b9247d9b66d8735a12da0985d76a9f8 Mon Sep 17 00:00:00 2001
From: Liam Miller-Cushon <cushon@google.com>
Date: Wed, 7 Jan 2026 01:21:35 +0100
Subject: [PATCH] Add a test

---
 ...bleObjectMethodReferencesOnInterfaces.java | 135 ++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 test/langtools/tools/javac/lambda/SerializableObjectMethodReferencesOnInterfaces.java

diff --git a/test/langtools/tools/javac/lambda/SerializableObjectMethodReferencesOnInterfaces.java b/test/langtools/tools/javac/lambda/SerializableObjectMethodReferencesOnInterfaces.java
new file mode 100644
index 00000000000..27fb3ac9aa5
--- /dev/null
+++ b/test/langtools/tools/javac/lambda/SerializableObjectMethodReferencesOnInterfaces.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2026, Google LLC 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @summary test lambda deserialization for Object method references on interfaces
+ * @library /tools/lib
+ * @modules jdk.compiler/com.sun.tools.javac.api
+ *          jdk.compiler/com.sun.tools.javac.main
+ *          jdk.jdeps/com.sun.tools.javap
+ * @build toolbox.ToolBox toolbox.JavacTask
+ * @run main SerializableObjectMethodReferencesOnInterfaces
+ */
+
+import java.io.Serializable;
+import java.lang.classfile.*;
+import java.lang.classfile.ClassFile;
+import java.lang.classfile.ClassModel;
+import java.lang.classfile.CodeElement;
+import java.lang.classfile.MethodModel;
+import java.lang.classfile.instruction.ConstantInstruction;
+import java.lang.classfile.instruction.InvokeInstruction;
+import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Iterator;
+
+public class SerializableObjectMethodReferencesOnInterfaces {
+
+    public static void main(String... args) throws Exception {
+        new SerializableObjectMethodReferencesOnInterfaces().run();
+    }
+
+    static class Test {
+        interface I1 extends Serializable {}
+
+        interface I2 extends I1 {
+            @Override
+            public int hashCode();
+        }
+
+        interface F<T, R> extends Serializable {
+            R apply(T t);
+        }
+
+        void f() throws Exception {
+            F<I1, Integer> f1 = I1::hashCode;
+            F<I2, Integer> f2 = I2::hashCode;
+        }
+    }
+
+    public void run() throws Exception {
+        URL url =
+                SerializableObjectMethodReferencesOnInterfaces.class.getResource(
+                        "SerializableObjectMethodReferencesOnInterfaces$Test.class");
+        Path file = Paths.get(url.toURI());
+
+        ClassModel cf = ClassFile.of().parse(file);
+        String actual = printDeserializationTests(cf);
+        String expected =
+                """
+                getImplMethodKind 5
+                getFunctionalInterfaceClass SerializableObjectMethodReferencesOnInterfaces$Test$F
+                getFunctionalInterfaceMethodName apply
+                getFunctionalInterfaceMethodSignature (Ljava/lang/Object;)Ljava/lang/Object;
+                getImplClass java/lang/Object
+                getImplMethodSignature ()I
+                getImplMethodKind 5
+                getFunctionalInterfaceClass SerializableObjectMethodReferencesOnInterfaces$Test$F
+                getFunctionalInterfaceMethodName apply
+                getFunctionalInterfaceMethodSignature (Ljava/lang/Object;)Ljava/lang/Object;
+                getImplClass java/lang/Object
+                getImplMethodSignature ()I
+                """;
+        if (!actual.equals(expected)) {
+            throw new AssertionError(
+                    "Unexpected deserialization tests, expected:\n"
+                            + expected
+                            + "\nactual:\n"
+                            + actual);
+        }
+    }
+
+    private static String printDeserializationTests(ClassModel cf) {
+        MethodModel m =
+                cf.methods().stream()
+                        .filter(
+                                x ->
+                                        x.methodName()
+                                                .stringValue()
+                                                .contentEquals("$deserializeLambda$"))
+                        .findFirst()
+                        .get();
+        Iterator<CodeElement> it = m.code().get().iterator();
+        StringBuilder sb = new StringBuilder();
+        while (it.hasNext()) {
+            CodeElement curr = it.next();
+            if (curr instanceof InvokeInstruction i
+                    && i.method()
+                            .owner()
+                            .asInternalName()
+                            .contentEquals("java/lang/invoke/SerializedLambda")) {
+                CodeElement next = it.next();
+                if (next instanceof ConstantInstruction c) {
+                    sb.append(
+                            i.method().name().stringValue()
+                                    + " "
+                                    + c.constantValue().toString()
+                                    + "\n");
+                }
+            }
+        }
+        return sb.toString();
+    }
+}