FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Java 1.8.0_60 64 Bit, Windows 7 64 Bit.

A DESCRIPTION OF THE PROBLEM :
Java 8 introduced changed default DateFormatSymbols (JDK-7079560). As our code relies on the 3 letter month code, we noticed that the former "MRZ" (MMM) suddenly was "MÄR" - we have german system language. So we changed our complete code to use "LLL" instead of "MMM". This worked at least untill 1.8.0_51.

 With 1.8.0_60, we get "MÄR" again instead of "MRZ".

REGRESSION. Last worked in version 8u51

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Here's is a simple test case:

-----------------
        GregorianCalendar c = new GregorianCalendar();
        c.set(2014, 2, 13);
        final Date d = c.getTime();

        final String s = d.toInstant().atZone(ZoneId.systemDefault()).format(DateTimeFormatter.ofPattern("yyyyLLL", Locale.GERMAN)); //1.8.0_60: "2014Mär", 1.8.0_51: "2014Mrz"
        System.out.println("Formatted (expected '2014Mrz' up to 1.8.0_51): "+s);
---------------


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
2014Mrz
ACTUAL -
2014Mär

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
        GregorianCalendar c = new GregorianCalendar();
        c.set(2014, 2, 13);
        final Date d = c.getTime();

        final String s = d.toInstant().atZone(ZoneId.systemDefault()).format(DateTimeFormatter.ofPattern("yyyyLLL", Locale.GERMAN)); //1.8.0_60: "2014Mär", 1.8.0_51: "2014Mrz"
        System.out.println("Formatted (expected '2014Mrz' up to 1.8.0_51): "+s);
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None that I know of. I tried pattern "yyyyMMM" instead of "yyyyLLL", but the result is the same wrong string "2014Mär" (instead of "2014Mrz").