8004094: Javac compiler error - synthetic method accessor generated with duplicate name

Summary: method clash check logic should skip methods marked with ACC_SYNTHETIC
Reviewed-by: jjg

src/share/classes/com/sun/tools/javac/comp/Check.java

@@ -1833,13 +1833,15 @@ public class Check {
         for (Scope.Entry e1 = t1.tsym.members().elems; e1 != null; e1 = e1.sibling) {
             Symbol s1 = e1.sym;
             Type st1 = null;
-            if (s1.kind != MTH || !s1.isInheritedIn(site.tsym, types)) continue;
+            if (s1.kind != MTH || !s1.isInheritedIn(site.tsym, types) ||
+                    (s1.flags() & SYNTHETIC) != 0) continue;
             Symbol impl = ((MethodSymbol)s1).implementation(site.tsym, types, false);
             if (impl != null && (impl.flags() & ABSTRACT) == 0) continue;
             for (Scope.Entry e2 = t2.tsym.members().lookup(s1.name); e2.scope != null; e2 = e2.next()) {
                 Symbol s2 = e2.sym;
                 if (s1 == s2) continue;
-                if (s2.kind != MTH || !s2.isInheritedIn(site.tsym, types)) continue;
+                if (s2.kind != MTH || !s2.isInheritedIn(site.tsym, types) ||
+                        (s2.flags() & SYNTHETIC) != 0) continue;
                 if (st1 == null) st1 = types.memberType(t1, s1);
                 Type st2 = types.memberType(t2, s2);
                 if (types.overrideEquivalent(st1, st2)) {

test/tools/javac/generics/8004094/B.java

+/*
+ * Copyright (c) 2012, 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.
+ */
+abstract class A {
+
+    private static String s = null;
+
+    static void test() {
+        new Object() {
+            void m() {
+                Object o = s;
+            }
+        };
+    }
+}
+
+public abstract class B<T> extends A {
+
+    private static Integer i = null;
+
+    static void test() {
+        new Object() {
+            void m() {
+                Object o = i;
+            }
+        };
+    }
+}

test/tools/javac/generics/8004094/T8004094.java

+/*
+ * Copyright (c) 2012, 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 8004094
+ * @summary Javac compiler error - synthetic method accessor generated with duplicate name
+ *
+ * @compile B.java T8004094.java
+ */
+
+public class T8004094 extends B<Object> { }