FULL PRODUCT 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)


Windows NT Version 4.0
Build 1381 Service pack 4

 DESCRIPTION OF THE PROBLEM :
If the wrapped stream of an InputStreamReader returns 0 in its read() method, InputStreamReader throws java.lang.Error.  This can be confusing and difficult to isolate.  It appears no such error was thrown in 1.3.0, 1.3.1_03.  A more graceful handling or additional documentation explicitly stating this may prevent  xxxxx s from making the same mistake.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See sample code.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
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 sun.nio.cs.StreamDecoder.read0(StreamDecoder.java:129)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:172)
        at java.io.InputStreamReader.read(InputStreamReader.java:167)
        at Test.go(Test.java:20)
        at Test.main(Test.java:6)

---------- BEGIN SOURCE ----------
import java.io.*;

public class Test {

  public static void main(String args[]) throws java.io.FileNotFoundException,
java.io.IOException {
    Test t=new Test(); t.go();
  }

  public void go() throws java.io.FileNotFoundException, java.io.IOException {
    InputStream inputStream=new FileInputStream("anyfile") {
      public int read(byte[] b, int off, int len) {
        //...
        return 0;
      }
    };

    inputStream.read(new byte[1],0,1); //ok

    InputStreamReader inputStreamr=new InputStreamReader(inputStream);
    inputStreamr.read(new char[1],0,1); //error
  }
}

---------- END SOURCE ----------
(Review ID: 146523) 
======================================================================

N/A

With the current 1.4.1 build, the test case provided in the description
loops forever.  This is another fencepost case in the StreamDecoder logic.

--  xxxxx@xxxxx  2002/5/14

If InputStream.read returns zero, we now throw an IOException with the
following message: Underlying input stream returned zero bytes.  Bug 4779065
has been filed to request clarification of the spec for InputStream.read
if no bytes are read.

--  xxxxx@xxxxx  2002-11-14

Good test scaffold, very thorough!

Good Bug by milka

Sun should consider fix it.

This is a big problem when using javax.comm.  If DSR is
dropped during a read it causes this crash...Please fix it!!

We are currently developing a major commercial software 
product and this bug is preventing us from moving to Java 
1.4.1. Does anyone at Sun know if this will be fixed in the 
1.4.2(Mantis release)?