Index: src/test/groovy/util/ProxyGeneratorTest.groovy
===================================================================
--- src/test/groovy/util/ProxyGeneratorTest.groovy	(revision 11194)
+++ src/test/groovy/util/ProxyGeneratorTest.groovy	(working copy)
@@ -82,6 +82,19 @@
         assert testClass.myMethodX() == "the injected X"
         assert testClass.myMethodE() == "the injected E"
     }
+    
+    void testDelegateForGROOVY_2705() {
+        def delegate = [1, 2, 3, 4, 5]
+        def testClass = ProxyGenerator.instantiateDelegate([List], delegate)
+        assert testClass instanceof List
+        assert 5 == testClass.size() 
+        assert [1, 2, 3, 4, 5] == testClass.iterator().collect { it }
+        assert 3 == testClass[2]
+        testClass[3] = 99
+        assert 99 == testClass[3]
+        testClass.removeRange(1, 3)
+        assert [1, 99, 5] == testClass
+    }
 }
 
 class TestClass {
Index: src/main/groovy/util/ProxyGenerator.java
===================================================================
--- src/main/groovy/util/ProxyGenerator.java	(revision 11194)
+++ src/main/groovy/util/ProxyGenerator.java	(working copy)
@@ -338,7 +338,7 @@
                 Method method = protectedMethods[i];
                 if (method.getName().indexOf('$') != -1)
                   continue;
-                if (Modifier.isProtected(method.getModifiers()))
+                if (Modifier.isProtected(method.getModifiers()) && !containsEquivalentMethod(protectedMethodList, method))
                     protectedMethodList.add(method);
             }
             currentClass = currentClass.getSuperclass();