FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)


FULL OS VERSION :
Windows XP SP2

A DESCRIPTION OF THE PROBLEM :
It seems that Client HostSpot does not properly handle assignment expression of local variables when those variables are used in a complex control flow.

The test case attached below illustrates the problem.

THE PROBLEM WAS REPRODUCIBLE WITH -Xint FLAG: No

THE PROBLEM WAS REPRODUCIBLE WITH -server FLAG: No

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile the test code below
2. Execute the code
     % java B


EXPECTED VERSUS ACTUAL BEHAVIOR :
In the test code below, RuntimeException should not be thrown, but client HostSpot throws.
ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.RuntimeException: 0 != 1
at B._assert(B.java:4)
at B.doTest(B.java:12)
at B.main(B.java:26)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class B {
    private static void _assert(int actual, int expected){
if (actual != expected){
throw new RuntimeException(actual + " != " + expected);
}
    }

    protected static void doTest() {
int a = 1;
int b = 0;
for (int i = 0; i < 2; i++){
_assert(b, i==0? 0 : 1);
boolean cont = true;
while (cont){
cont = false;
if (i == 0){
b = a;
a = 2;
}
}
}
for (int i = 0; i < 1000; i++);
    }
    public static void main(String[] args) {
for(int i = 0; i < 4; i++){
doTest();
}
    }
}


---------- END SOURCE ----------

Release Regression From : 6
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.