Description:
              Invoking the Deflater.setDictionary() method more than once and setting the dictionary during Inflate using Inflater.setDictionary() method, causes IllegalArgumentException to be thrown. Please find the test code as given below:

<code>
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

public class SetDictionaryInvokedTwice {
      public static void main(String...args){
        try {
            byte[] input = "Trying to invoke setDictionary twice twice twice".getBytes();
            byte[] output = new byte[100];
            Deflater def = new Deflater();
            def.setDictionary("twice".getBytes());
            def.setDictionary("twice".getBytes()); // Invoking setDictionary twice
            def.setInput(input);
            def.finish();
            int compressedLen = def.deflate(output);

            Inflater inf = new Inflater();
            inf.setInput(output, 0, compressedLen);
            byte[] result = new byte[100];
            if (inf.inflate(result)== 0 && inf.needsDictionary()) {
                inf.setDictionary("twice".getBytes());
                inf.inflate(result);
            }
            inf.end();
        } catch (DataFormatException dex) {
            dex.printStackTrace();
        }
        catch(IllegalArgumentException iae){
            System.err.println("IllegalArgumentException thrown when Deflater.setDictionary is invoked twice");
            iae.printStackTrace();
        }
    }

}

</code>
<output>
IllegalArgumentException thrown when Deflater.setDictionary is invoked twice
java.lang.IllegalArgumentException
        at java.util.zip.Inflater.setDictionary(Native Method)
        at java.util.zip.Inflater.setDictionary(Inflater.java:159)
        at java.util.zip.Inflater.setDictionary(Inflater.java:173)
        at SetDictionaryInvokedTwice.main(SetDictionaryInvokedTwice.java:21)

</output>

Tried in :
<version>
bash-3.00$ java -version
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b13)
Java HotSpot(TM) Client VM (build 1.7.0-ea-b13, mixed mode)

bash-3.00$ uname -a
SunOS hrajan 5.10 Generic sun4u sparc SUNW,Sun-Blade-100
</version>
*** (#1 of 1): 2007-04-05 12:17:00 IST ###@###.###