Charset versus InputStreamReader: incoherence with Cp037

Question

Hello
I am tring to use the java.nio.Charset class and it seems incoherent with the InputStreamReader support of various encoding scheme, specialy the EBCDIC IBM US one: Cp037...
java version "1.4.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_02-b06)
Java HotSpot(TM) Client VM (build 1.4.1_02-b06, mixed mode)
What's wrong with this code!!!
* @author Francis ANDRE
import java.io.*;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.*;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
public class EBCDIC {
     String     charset;
     EBCDIC(String charset) {
          this.charset = charset;
     InputStreamReader open(InputStream is) throws UnsupportedEncodingException {
          InputStreamReader isr = new InputStreamReader(is, charset);
          return isr;
     void read(InputStreamReader is) throws IOException {
          String css = is.getEncoding();
          System.out.println(css);
          char[]     ib = new char[4];
          is.read(ib);
          System.out.println(ib);
     void decode(byte[] in) {
          Charset          charset = Charset.forName("Cp037");
          CharsetDecoder decoder = charset.newDecoder();
          ByteBuffer bytes     = ByteBuffer.wrap(in);
          CharBuffer chars = null;
          try {
               chars = decoder.decode(bytes);
          } catch (CharacterCodingException e) {
               System.err.println("Error decoding");
               System.exit(-1);
     public static void main(String[] args) {
//          Convert.main(null);
          try {
               EBCDIC ebcdic = new EBCDIC("Cp037");
               byte[] in = {(byte) 0xF1, (byte) 0xF2, (byte) 0xF3, (byte) 0xF4 };
               ByteArrayInputStream bais = new ByteArrayInputStream(in);
               InputStreamReader isr = ebcdic.open(bais);
               ebcdic.read(isr);
               System.out.println(Charset.availableCharsets() );
               System.out.println("Is Cp037 supported: " + Charset.isSupported("Cp037"));
               ebcdic.decode(in);
          } catch (Exception e) {
               e.printStackTrace();
C: java EBCDIC
Cp037
1234
{Big5=Big5, Big5-HKSCS=Big5-HKSCS, EUC-CN=EUC-CN, EUC-JP=EUC-JP, euc-jp-linux=eu
c-jp-linux, EUC-KR=EUC-KR, EUC-TW=EUC-TW, GB18030=GB18030, GBK=GBK, ISCII91=ISCI
I91, ISO-2022-CN-CNS=ISO-2022-CN-CNS, ISO-2022-CN-GB=ISO-2022-CN-GB, ISO-2022-KR
=ISO-2022-KR, ISO-8859-1=ISO-8859-1, ISO-8859-13=ISO-8859-13, ISO-8859-15=ISO-88
59-15, ISO-8859-2=ISO-8859-2, ISO-8859-3=ISO-8859-3, ISO-8859-4=ISO-8859-4, ISO-
8859-5=ISO-8859-5, ISO-8859-6=ISO-8859-6, ISO-8859-7=ISO-8859-7, ISO-8859-8=ISO-
8859-8, ISO-8859-9=ISO-8859-9, JIS0201=JIS0201, JIS0208=JIS0208, JIS0212=JIS0212
, Johab=Johab, KOI8-R=KOI8-R, Shift_JIS=Shift_JIS, TIS-620=TIS-620, US-ASCII=US-
ASCII, UTF-16=UTF-16, UTF-16BE=UTF-16BE, UTF-16LE=UTF-16LE, UTF-8=UTF-8, windows
-1250=windows-1250, windows-1251=windows-1251, windows-1252=windows-1252, window
s-1253=windows-1253, windows-1254=windows-1254, windows-1255=windows-1255, windo
ws-1256=windows-1256, windows-1257=windows-1257, windows-1258=windows-1258, wind
ows-936=windows-936, windows-949=windows-949, windows-950=windows-950}
Is Cp037 supported: false
java.nio.charset.UnsupportedCharsetException: Cp037
at java.nio.charset.Charset.forName(Charset.java:428)
at EBCDIC.decode(EBCDIC.java:40)
at EBCDIC.main(EBCDIC.java:67)

Answer 1

http://java.sun.com/j2se/1.4.1/docs/guide/intl/encoding.doc.html
as you can see, cp037 is not (yet?) supported by java.nio.