Name: sdC67446 Date: 02/24/98


Constructor java.util.zip.DeflaterOutputStream(OutputStream os)
doesn't check input parameter for null. Thus calling the write method
later causes undocumented NullPointerException.

The similar bug is present in InflaterInputStream constructor as well.
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Here is the test demonstrating the bug:
-----------------Test.java------------------------
import java.util.zip.*;
import java.io.*;

public class Test {
  
  public static void main(String[] args) {
    DeflaterOutputStream dos = new DeflaterOutputStream(null);
    try {
      dos.write(123);
    } catch (NullPointerException e) {
      System.out.println(e);
    } catch (IOException e) {
      System.out.println(e);
    }
  }
}
---------Output from the test---------------------
java.lang.NullPointerException
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