FULL PRODUCT VERSION :
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Client VM (build 1.6.0_02-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
XP SP2

A DESCRIPTION OF THE PROBLEM :
Character decoder x-ISO-2022-CN-GB & x-ISO-2022-CN-CNS throws NullPointerException

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run test case below

ACTUAL -
Exception thrown

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
        at sun.nio.cs.ext.ISO2022_CN$Decoder.SODecode(ISO2022_CN.java:116)
        at sun.nio.cs.ext.ISO2022_CN$Decoder.decodeArrayLoop(ISO2022_CN.java:368
)
        at sun.nio.cs.ext.ISO2022_CN$Decoder.decodeLoop(ISO2022_CN.java:383)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:544)
        at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:140)
        at java.lang.StringCoding.decode(StringCoding.java:173)
        at java.lang.String.<init>(String.java:444)
        at java.lang.String.<init>(String.java:516)
        at EncErr2.main(EncErr2.java:12)
java.lang.NullPointerException
        at sun.nio.cs.ext.ISO2022_CN$Decoder.SODecode(ISO2022_CN.java:114)
        at sun.nio.cs.ext.ISO2022_CN$Decoder.decodeArrayLoop(ISO2022_CN.java:368
)
        at sun.nio.cs.ext.ISO2022_CN$Decoder.decodeLoop(ISO2022_CN.java:383)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:544)
        at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:140)
        at java.lang.StringCoding.decode(StringCoding.java:173)
        at java.lang.String.<init>(String.java:444)
        at java.lang.String.<init>(String.java:516)
        at EncErr2.main(EncErr2.java:22)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.*;
import java.nio.charset.*;
import java.util.*;
public class EncErr2 {
    public static void main(String[] args){
        String enc = "x-ISO-2022-CN-CNS";
        int c = 0xa7;
        String s = String.valueOf((char)c);
        byte[] bb = null;
        try {
            bb = s.getBytes(enc);
            String str = new String(bb,enc);
        } catch (Throwable th){
            th.printStackTrace(System.err);
        }
        enc = "x-ISO-2022-CN-GB";
        c = 0xa4;
        s = String.valueOf((char)c);
        bb = null;
        try {
            bb = s.getBytes(enc);
            String str = new String(bb,enc);
        } catch (Throwable th){
            th.printStackTrace(System.err);
        }
    }
}
---------- END SOURCE ----------