A DESCRIPTION OF THE REQUEST :
 

    ByteArrayOutputStream baos = new ByteArrayOutputStream(128);
    baos.write(123); // does NOT have a throws-exception clause
    try
    {
      baos.write("Hello world".getBytes()); // HAS a throws-exception clause
    }
    catch (IOException e)
    {
      // even though it never happens
    }

JUSTIFICATION :
It's contradictive.
And it's easy to solve, without impact.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The ByteArrayOutputStream class should extend the OutputStream#write(byte[]) method and remove the exception clause:

    @Override
    public void write(byte b[]) // no more exception here.
    {
      try { super.write(b); } catch(IOException ioe) {}
    }
ACTUAL -
Right now, you just always have to make an empty catch-block whenever you use this write(byte[]) method.

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try
    {
      baos.write(byteArray);
    }
    catch (IOException ioe)
    {
      // never happens
    }

---------- BEGIN SOURCE ----------
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try
    {
      baos.write(byteArray);
    }
    catch (IOException ioe)
    {
      // never happens
    }
---------- END SOURCE ----------