Problem with display binary image in portlet

Hi everyone,
I'm writing a simple portlet to display an image from a binary image.
However, what I get from the portlet is all binary data. This is what I have
done:

		response.setContentType("image/gif");
		OutputStream outStream = response.getPortletOutputStream();
		byte image[] = null;
		try {
			image = getImage();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		outStream.write(image);
		outStream.flush();

and this is my portlet.xml
	<portlet>
		<portlet-name>Image</portlet-name>
		<display-name>Image Portlet</display-name>
		<portlet-class>
			org.apache.ws.axis2.ImageGetter
		</portlet-class>
		<supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
        </supports>
		<supports>
			<mime-type>image/gif</mime-type>
			<portlet-mode>VIEW</portlet-mode>
		</supports>
		<portlet-info>
			<title>Image Title</title>
		</portlet-info>
	</portlet>

Could anyone please help me out of this.
Thank you so much.
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