8012028: Metafactory-generated lambda classes should be final

8008941: isSynthetic() returns false for lambda instances
Reviewed-by: mduigou

src/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java

@@ -184,7 +184,7 @@ import java.security.PrivilegedAction;
         for (int i=0; i<markerInterfaces.length; i++) {
             interfaces[i+1] = markerInterfaces[i].getName().replace('.', '/');
         }
-        cw.visit(CLASSFILE_VERSION, ACC_SUPER + ACC_FINAL,
+        cw.visit(CLASSFILE_VERSION, ACC_SUPER + ACC_FINAL + ACC_SYNTHETIC,
                  lambdaClassName, null,
                  NAME_MAGIC_ACCESSOR_IMPL, interfaces);
 

test/java/lang/invoke/lambda/LambdaClassFinal.java

+/*
+ * Copyright (c) 2013, 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.
+ *
+ * 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
+ * @bug 8012028
+ * @summary Generated Lambda implementing class should be final
+ */
+
+import java.lang.reflect.Modifier;
+import java.io.Serializable;
+
+public class LambdaClassFinal {
+
+    interface I {
+        void m();
+    }
+
+    interface Iser extends Serializable {
+        void m();
+    }
+
+    static void assertTrue(boolean cond) {
+        if (!cond)
+            throw new AssertionError();
+    }
+
+    public static void main(String[] args) throws Exception {
+        new LambdaClassFinal().test();
+    }
+
+     void test() throws Exception {
+        I lam = () -> { };
+        assertTrue((lam.getClass().getModifiers() & Modifier.FINAL) != 0);
+        Iser slam = () -> { };
+        assertTrue((slam.getClass().getModifiers() & Modifier.FINAL) != 0);
+    }
+}

test/java/lang/invoke/lambda/LambdaClassSynthetic.java

+/*
+ * Copyright (c) 2013, 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.
+ *
+ * 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
+ * @bug 8008941
+ * @summary Generated Lambda implementing class should be synthetic
+ */
+
+import java.lang.reflect.Modifier;
+import java.io.Serializable;
+
+public class LambdaClassSynthetic {
+
+    interface I {
+        void m();
+    }
+
+    interface Iser extends Serializable {
+        void m();
+    }
+
+    static void assertTrue(boolean cond) {
+        if (!cond)
+            throw new AssertionError();
+    }
+
+    public static void main(String[] args) throws Exception {
+        new LambdaClassFinal().test();
+    }
+
+    void test() throws Exception {
+        I lam = () -> { };
+        assertTrue(lam.getClass().isSynthetic());
+        Iser slam = () -> { };
+        assertTrue(slam.getClass().isSynthetic());
+    }
+}