Name: sdC67446 Date: 02/12/98


Constructor java.util.zip.DeflaterOutputStream(OutputStream os, Deflater def)
doesn't check parameter "def" 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) {

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    Deflater def = null;
    
    DeflaterOutputStream defOS = new DeflaterOutputStream(bos, def);
    System.out.println("Constructed!");
    
    try {
      defOS.write(100);
    } catch ( NullPointerException e ) {
      System.out.println("NullPointerException thrown while writing!");
    } catch ( IOException e ) {
      System.out.println(e);
    }
  }
}
---------Output from the test---------------------
Constructed!
NullPointerException thrown while writing!
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