Name: bkR10012 Date: 04/18/2001


Spec. of the class javax.imageio.ImageReader says:

"processWarningOccurred

protected void processWarningOccurred(String baseName,
                                      String keyword)

     Broadcasts a localized warning message to all registered
     IIOReadWarningListeners by calling their warningOccurred
     method with a string taken from a ResourceBundle."
     
Spec. doesn't describe any exceptions for this method.
But method processWarningOccurred throws unexpected exceptions
in following cases:

NullPointerException - if locale has not been set when listener is added
NullPointerException - if baseName or keyword is null
MissingResourceException - if no resource bundle for the specified
                           base name can be found
MissingResourceException - if no object for the given key can be found
ClassCastException - if the object found for the given key is not a string

See test source and log below.
---------------------------------------- test.java
import javax.imageio.*;
import javax.imageio.event.*;
import javax.imageio.spi.*;
import javax.imageio.metadata.*;
import java.util.*;
import java.awt.image.BufferedImage;
import java.io.IOException;

public class test {

    public static void main(String argv[]) {
        DummyImageReaderImpl ireader;
        MyReadWarningListener rwl;
        Locale[] locales = {new Locale("ru"),
                            new Locale("fr"),
                            new Locale("uk"),
                           };
        Locale new_locale;
        
        ireader = new DummyImageReaderImpl(null);
        rwl = new MyReadWarningListener();

        ireader.addIIOReadWarningListener(rwl);
        ireader.setAvailableLocales(locales);
        new_locale = new Locale("fr");
        ireader.setLocale(new_locale);

        try {
            ireader.processWarningOccurred("Stats", "water");
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 1: " + ee);
        }
        
        ireader.removeAllIIOReadWarningListeners();
        ireader.addIIOReadWarningListener(rwl);
         
        try {
            ireader.processWarningOccurred("NonExistent", "water");
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 2: " + ee);
        }
        try {
            ireader.processWarningOccurred("Stats", "anyKey");
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 3: " + ee);
        }
        try {
            ireader.processWarningOccurred(null, "water");
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 4: " + ee);
        }
        try {
            ireader.processWarningOccurred("Stats", null);
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 5: " + ee);
        }
        try {
            ireader.processWarningOccurred("Stats", "int");
        } catch (Throwable ee) {
            System.out.println("Unexpected exception 6: " + ee);
        }

        ireader.processWarningOccurred("Stats", "water");
    }
}

class DummyImageReaderImpl extends ImageReader {
    public DummyImageReaderImpl(ImageReaderSpi originatingProvider) {
        super(originatingProvider);
    }
    public void processWarningOccurred(String baseName, String keyword) {
        super.processWarningOccurred(baseName, keyword);
    }
    public void setAvailableLocales(Locale[] locales) {
        if (locales == null || locales.length == 0)
            availableLocales = null;
        else
            availableLocales = (Locale[])locales.clone();
    }
    public int getNumImages(boolean allowSearch)
        throws IOException {return 1;}
    public int getWidth(int imageIndex) throws IOException {return 1;}
    public int getHeight(int imageIndex) throws IOException {return 1;}
    public Iterator getImageTypes(int imageIndex)
        throws IOException {return null;}
    public IIOMetadata getStreamMetadata()
        throws IOException {return null;}
    public IIOMetadata getImageMetadata(int imageIndex)
        throws IOException {return null;}
    public BufferedImage read(int imageIndex, ImageReadParam param)
        throws IOException {return null;}
}

class MyReadWarningListener implements IIOReadWarningListener {
    public void warningOccurred(ImageReader source, String warning) {
        System.out.println(warning);
    }
}
---------------------------------------- Stats_fr.java
import java.util.*;

public class Stats_fr extends ListResourceBundle {
  public Object[][] getContents(){
    return contents;
  }
  private Object[][] contents = {
    {"coffee", new String("coffee from Stats_fr class")},
    {"tea", new String("tea from Stats_fr class")},
    {"water", new String("water from Stats_fr class")},
    {"int", new Integer(1)}
  };
}
----------------------------------------
% java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b60)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b60, mixed mode)
% java test
Unexpected exception 1: java.lang.NullPointerException
Unexpected exception 2: java.util.MissingResourceException: Can't find
bundle for base name NonExistent, locale fr
Unexpected exception 3: java.util.MissingResourceException: Can't find
resource for bundle Stats_fr, key anyKey
Unexpected exception 4: java.lang.NullPointerException
Unexpected exception 5: java.lang.NullPointerException
Unexpected exception 6: java.lang.ClassCastException: java.lang.Integer
water from Stats_fr class
----------------------------------------
This bug causes failure of the new JCK test
api/javax_imageio/ImageReader/index.html#readWarningListener

======================================================================

Name: bkR10012 Date: 05/11/2001


The method processWarningOccurred in javax.imageio.ImageWriter
also throws the same unexpected exceptions in the same cases.

This bug causes failure of the new JCK test
api/javax_imageio/ImageWriter/index.html#writeWarningListener


======================================================================