7122138: IAE thrown because Introspector ignores synthetic methods

Reviewed-by: rupashka

src/share/classes/java/beans/Introspector.java

@@ -473,7 +473,7 @@ public class Introspector {
             // Now analyze each method.
             for (int i = 0; i < methodList.length; i++) {
                 Method method = methodList[i];
-                if (method == null || method.isSynthetic()) {
+                if (method == null) {
                     continue;
                 }
                 // skip static methods.

src/share/classes/java/beans/PropertyDescriptor.java

@@ -559,7 +559,7 @@ public class PropertyDescriptor extends FeatureDescriptor {
 
         // Normally give priority to y's readMethod.
         try {
-            if (yr != null && yr.getDeclaringClass() == getClass0()) {
+            if (isAssignable(xr, yr)) {
                 setReadMethod(yr);
             } else {
                 setReadMethod(xr);
@@ -713,4 +713,37 @@ public class PropertyDescriptor extends FeatureDescriptor {
         appendTo(sb, "readMethod", this.readMethodRef);
         appendTo(sb, "writeMethod", this.writeMethodRef);
     }
+
+    private boolean isAssignable(Method m1, Method m2) {
+        if (m1 == null) {
+            return true; // choose second method
+        }
+        if (m2 == null) {
+            return false; // choose first method
+        }
+        if (!m1.getName().equals(m2.getName())) {
+            return true; // choose second method by default
+        }
+        Class<?> type1 = m1.getDeclaringClass();
+        Class<?> type2 = m2.getDeclaringClass();
+        if (!type1.isAssignableFrom(type2)) {
+            return false; // choose first method: it declared later
+        }
+        type1 = getReturnType(getClass0(), m1);
+        type2 = getReturnType(getClass0(), m2);
+        if (!type1.isAssignableFrom(type2)) {
+            return false; // choose first method: it overrides return type
+        }
+        Class<?>[] args1 = getParameterTypes(getClass0(), m1);
+        Class<?>[] args2 = getParameterTypes(getClass0(), m2);
+        if (args1.length != args2.length) {
+            return true; // choose second method by default
+        }
+        for (int i = 0; i < args1.length; i++) {
+            if (!args1[i].isAssignableFrom(args2[i])) {
+                return false; // choose first method: it overrides parameter
+            }
+        }
+        return true; // choose second method
+    }
 }

test/java/beans/Introspector/7122138/Test7122138.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 7122138
+ * @summary Tests generic methods reflection
+ * @author Sergey Malenkov
+ * @library ..
+ */
+
+import pack.Sub;
+
+public class Test7122138 {
+
+    public static void main(String[] args) throws Exception {
+        Class<Sub> type = Sub.class;
+        Sub object = type.newInstance();
+        String name = "name";
+        BeanUtils.getPropertyDescriptor(type, name).getWriteMethod().invoke(object, name);
+        if (!name.equals(object.getName())) {
+            throw new Error("name is not set");
+        }
+    }
+}

test/java/beans/Introspector/7122138/pack/Sub.java

+package pack;
+
+public class Sub<String> extends Super {
+}

test/java/beans/Introspector/7122138/pack/Super.java

+package pack;
+
+class Super<T> {
+
+    T name;
+
+    public void setName(T name) {
+        this.name = name;
+    }
+
+    public T getName() {
+        return name;
+    }
+}