Name: auR10023 Date: 03/19/2002



Method java.nio.channels.Channels.newReader(ReadableByteChannel ch,
CharsetDecoder dec, int minBufferCap) called with minBufferCap = 0, 1
and CharsetDecoder of the UTF-16 charset returns Reader with following
incorrect behavior:

if minBufferCap=1, obtained Reader hangs when Reader.read() operation is
performed. if minBufferCap=0, obtained Reader throws java.lang.Error
exception.

Here is the example:
-------------test.java--------------
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;

public class test {
    public static void main(String[] args) {
        try {
            Charset cs = Charset.forName("UTF-16");
            ByteArrayInputStream bis = new ByteArrayInputStream(new byte[100]);
            ReadableByteChannel ch = Channels.newChannel(bis);
            Reader r = Channels.newReader(ch, cs.newDecoder(),
                Integer.parseInt(args[0]));
            char [] arr = new char[10];
            r.read(arr, 0, arr.length);
        } catch (Exception e) {
            System.out.println("Exception: ");
            e.printStackTrace(System.out);
            return;
        }
    }
}

#java -version
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

#java test 0
Exception in thread "main" java.lang.Error
        at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:417)
        at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:442)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:179)
        at test.main(test.java:15)
        
#java test 1
        -- hangs

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