FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b141)
Java HotSpot(TM) Client VM (build 21.0-b11, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Good code causes a compiler error.
This is a regression. Not happened in 1.7.0-ea-b139
The error code is:

error: length in Array is defined in an inaccessible class or interface

REGRESSION. Last worked in version 7

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the code below.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Non compiler errors.
ACTUAL -
C:\data\LearnJAVA2\JDK7Bugs\src\ArraylengthError.java
    Error:Error:line (5)error: length in Array is defined in an inaccessible class or interface

ERROR MESSAGES/STACK TRACES THAT OCCUR :
C:\data\LearnJAVA2\JDK7Bugs\src\ArraylengthError.java
    Error:Error:line (5)error: length in Array is defined in an inaccessible class or interface

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class ArraylengthError {

    protected static int arraylength(Class<? extends Enum<?>> etype) {

        int n = etype.getEnumConstants().length;

        return n;
    }

}

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

CUSTOMER SUBMITTED WORKAROUND :
We can change all such pattern in code, but it is quite difficult.