java enum hashcode not stable among JDK 7

FULL PRODUCT VERSION :
JDK 1.7 Version
=============
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b22)
Java HotSpot(TM) Client VM (build 23.0-b21, mixed mode, sharing)

JDK 1.6 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)



ADDITIONAL OS VERSION INFORMATION :
System: Microsoft XP Professional version 2002 Service Pack 3
Version: 5.1.2600 Service Pack 3 Build 2600

A DESCRIPTION OF THE PROBLEM :
The hash code value is not stable in JDK 1.7, but t is same in JDK 1.6 if you run multiple time.

REGRESSION. Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Source code is attached. Kindly run the source code for the JDK version mentioned.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The hash code value is not stable in JDK 1.7
ACTUAL -
JDK 1.7
=======
G:\javapgms>java TestEnum
hashCode get: 18426253
hashCode instance: 77

G:\javapgms>java TestEnum
hashCode get: 3195425
hashCode instance: 77

G:\javapgms>java TestEnum
hashCode get: 3195425
hashCode instance: 77

JDK 1.6
======
G:\javapgms>java TestEnum
hashCode get: 11394033
hashCode instance: 77

G:\javapgms>java TestEnum
hashCode get: 11394033
hashCode instance: 77

G:\javapgms>java TestEnum
hashCode get: 11394033
hashCode instance: 77

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
The below program were tried in JDK 1.6 and JDK1.7

The hash code value is not stable in JDK 1.7, but it is same in JDK 1.6

class TestEnum {
    enum Gender {
        M("Male"), F("Female");

private String description;

Gender(String description){
this.description = description;
}
    }

public static void main(String args[]) {
TestEnum t = new TestEnum();
t.setGender(Gender.M.name());
System.out.println("hashCode get: " + t.getGender().hashCode());
System.out.println("hashCode instance: " + t.gender.hashCode());
    }

public String gender = null;

public void setGender(String gender){
this.gender = gender;
}

public Gender getGender(){
return Gender.valueOf(this.gender);
}

}


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