FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
$ javac -J-showversion -fullversion Test3.java
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b71)
Java HotSpot(TM) Client VM (build 16.0-b08, mixed mode, sharing)

javac full version "1.7.0-ea-b71"
$ java -showversion Test3
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b71)
Java HotSpot(TM) Server VM (build 16.0-b08, mixed mode)

Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
        at Test3.testInnerClassWithMismatchedOuterType(Test3.java:26)
        at Test3.main(Test3.java:30)
$ cat -n Test3.java
     1 import java.util.*;
     2
     3 class Test3 {
     4 static class ListHolder<T> {
     5 final List<T> list = new ArrayList<T>();
     6
     7 class Inserter {
     8 Inserter(T itemToAdd) {
     9 list.add(itemToAdd);
    10 }
    11 }
    12 }
    13
    14 static class StringListHolder extends ListHolder<String> {
    15 class IntInserter extends ListHolder<Integer>.Inserter {
    16 IntInserter() {
    17 super(42);
    18 }
    19 }
    20 }
    21
    22 public void testInnerClassWithMismatchedOuterType() {
    23 StringListHolder list = new StringListHolder();
    24 list.new IntInserter();
    25
    26 System.out.println(list.list.get(0).length());
    27 }
    28
    29 public static void main(String... args) {
    30 new Test3().testInnerClassWithMismatchedOuterType();
    31 }
    32 }
    33


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The program should fail to compile.
ACTUAL -
The program compiles and causes a class cast exception.

REPRODUCIBILITY :
This bug can be reproduced always.