Index: compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedTypeBinding.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedTypeBinding.java,v
retrieving revision 1.94
diff -u -r1.94 ParameterizedTypeBinding.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedTypeBinding.java	12 Apr 2007 10:32:24 -0000	1.94
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedTypeBinding.java	24 May 2007 19:30:57 -0000
@@ -399,6 +399,7 @@
 	 */
 	public MethodBinding getExactConstructor(TypeBinding[] argumentTypes) {
 		int argCount = argumentTypes.length;
+		MethodBinding match = null;
 
 		if ((tagBits & TagBits.AreMethodsComplete) != 0) { // have resolved all arg types & return type of the methods
 			long range;
@@ -409,8 +410,9 @@
 						TypeBinding[] toMatch = method.parameters;
 						for (int iarg = 0; iarg < argCount; iarg++)
 							if (toMatch[iarg] != argumentTypes[iarg])
-								continue nextMethod;
-						return method;
+								continue nextMethod;;
+						if (match != null) return null; // collision case
+						match = method;
 					}
 				}
 			}
@@ -422,12 +424,13 @@
 				if (toMatch.length == argCount) {
 					for (int p = 0; p < argCount; p++)
 						if (toMatch[p] != argumentTypes[p])
-							continue nextMethod;
-						return method;
+							continue nextMethod;;
+						if (match != null) return null; // collision case
+						match = method;
 				}
 			}
 		}
-		return null;
+		return match;
 	}
 
 	/**
Index: src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java,v
retrieving revision 1.44
diff -u -r1.44 AmbiguousMethodTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java	24 May 2007 14:29:36 -0000	1.44
+++ src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java	24 May 2007 19:30:57 -0000
@@ -2039,4 +2039,35 @@
 		},
 		"");
 }
+// https://bugs.eclipse.org/bugs/show_bug.cgi?id=188960
+public void test059() {
+	this.runNegativeTest(
+		new String[] {
+			"X.java",
+			"class X<T> {\n" + 
+			"	X() {}\n" + 
+			"	X(String s) {}\n" + 
+			"	X(T t) {}\n" + 
+			"}\n" +
+			"class NoErrorSubclass extends X<String> {}\n" +
+			"class StringOnlySubClass extends X<String> {\n" +
+			"	StringOnlySubClass(String s) { super(s); }\n" +
+			"}\n" +
+			"class Test {\n" +
+			"	Object s = new X<String>(\"xyz\");\n" +
+			"}"
+		},
+		"----------\n" + 
+		"1. ERROR in X.java (at line 8)\n" + 
+		"	StringOnlySubClass(String s) { super(s); }\n" + 
+		"	                               ^^^^^^^^^\n" + 
+		"The constructor X<String>(String) is ambiguous\n" + 
+		"----------\n" + 
+		"2. ERROR in X.java (at line 11)\n" + 
+		"	Object s = new X<String>(\"xyz\");\n" + 
+		"	           ^^^^^^^^^^^^^^^^^^^^\n" + 
+		"The constructor X<String>(String) is ambiguous\n" + 
+		"----------\n"
+	);
+}
 }