FULL PRODUCT VERSION :
java version "1.6.0",
java version "1.5.0_04",
java version "1.4.2_05"

ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.19-1.2288.2.4.fc5,
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
com.sun.imageio.plugins.pngPNGMetadata#mergeNativeTree incorrectly stores iTXt_compressionFlag values.   At line 1406 (iTXt_compressionFlag.add(new Boolean(compressionFlag));), values are added to the iTXt_compressionFlag ArrayList as Boolean objects.  If they are later retieved in a call to getNativeTree the objects are cast to Integer, which creates an exception.  Other references to iTXt_compressionFlag use Integer, so line 1406 should store the value as an integer.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
a new test.png file, with an iTXt cluster containing the text "<xml></xml>"
ACTUAL -
java.lang.ClassCastException, see below

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Integer
	at com.sun.imageio.plugins.png.PNGImageWriter.write_iTXt(PNGImageWriter.java:680)
	at com.sun.imageio.plugins.png.PNGImageWriter.write(PNGImageWriter.java:1120)
	at javax.imageio.ImageWriter.write(ImageWriter.java:580)
	at org.mbari.aosn.moqua.image.Test1.main(Test1.java:56)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package org.mbari.aosn.moqua.image;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.IIOImage;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.FileImageOutputStream;
import javax.imageio.stream.ImageOutputStream;

import org.w3c.dom.Node;

import com.sun.imageio.plugins.png.PNGImageWriter;
import com.sun.imageio.plugins.png.PNGImageWriterSpi;

public class Test1 {

	static public void main(String args[]) {
		try {
			File file = new File("test.png");
			BufferedImage image = new BufferedImage(128, 128,
					BufferedImage.TYPE_4BYTE_ABGR_PRE);
			Graphics2D graph = image.createGraphics();
			graph.setPaintMode();
			graph.setColor(Color.orange);
			graph.fillRect(32, 32, 64, 64);
			graph.dispose();
			ImageOutputStream imageOutputStream = new FileImageOutputStream(
					file);
			ImageTypeSpecifier imageTypeSpecifier = new ImageTypeSpecifier(
					image);
			ImageWriter imageWriter = new PNGImageWriter(
					new PNGImageWriterSpi());
			imageWriter.setOutput(imageOutputStream);
			IIOMetadata metadata = imageWriter.getDefaultImageMetadata(
					imageTypeSpecifier, null);
			String formatNames[] = metadata.getMetadataFormatNames();
			for (String formatName : formatNames) {
				IIOMetadataFormat format = metadata
						.getMetadataFormat(formatName);
				Node node = metadata.getAsTree(formatName);
				if (formatName.contains("png")) {
					IIOMetadataNode iTXt = new IIOMetadataNode("iTXt");
					IIOMetadataNode iTXtEntry = new IIOMetadataNode("iTXtEntry");
					iTXtEntry.setAttribute("keyword", "XML:com.adobe.xmp");
					iTXtEntry.setAttribute("compressionFlag", "false");
					iTXtEntry.setAttribute("compressionMethod", "0");
					iTXtEntry.setAttribute("languageTag", "en");
					iTXtEntry.setAttribute("translatedKeyword",
							"XML:com.adobe.xmp");
					iTXtEntry.setAttribute("text", "<xml></xml>");
					iTXt.appendChild(iTXtEntry);
					node.appendChild(iTXt);
					metadata.setFromTree(formatName, node);
					break;
				}
			}
			imageWriter.write(new IIOImage(image, null, metadata));
			imageOutputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
before calling mageWriter.write(new IIOImage(image, null, metadata));
insert the following lines (which resolves this problem and a similar problem involving iTXt_compressionMethod):

			if(metadata instanceof PNGMetadata){
				List iTXt_compressionFlag = ((PNGMetadata)metadata).iTXt_compressionFlag;
				for(int i = 0; i < iTXt_compressionFlag.size(); ++i){
					Object flag = iTXt_compressionFlag.get(i);
					if(flag instanceof Boolean){
						iTXt_compressionFlag.set(i,Integer.valueOf(((Boolean)flag).booleanValue()?1:0));
					}
				}
				List iTXt_compressionMethod = ((PNGMetadata)metadata).iTXt_compressionMethod;
				for(int i = 0; i < iTXt_compressionMethod.size(); ++i){
					Object method = iTXt_compressionMethod.get(i);
					if(method instanceof String){
						try{
							iTXt_compressionMethod.set(i,Integer.valueOf((String)method));
						} catch (NumberFormatException NFE) {
							iTXt_compressionMethod.set(i,Integer.valueOf(0));
						}
					}
				}
			}