hx:graphicImageEx displaying images represented by byte array   

I'm trying to display a list of images using hx:graphicImageEx and h:dataTable components.

<h:dataTable value="#{signature.imageList}" var="signatureImage">
	<h:column>		                      	
		 <hx:graphicImageEx   value="#{signatureImage.data}" mimeType="image/*" />
		 <h:outputText value="#{signatureImage.data[0]}"/>
                 <hx:graphicImageEx   value="#{signature.imageList[0].data}" mimeType="image/*"  />
	</h:column>
</h:dataTable>

#{signature.imageList} represents an arraylist of type Image

public class Image {
	
	private String id;
	private String type;
	private byte[] data;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
	public byte[] getData() {		
		return data;
	}
	public void setData(byte[] data) {
		this.data = data;
	}
}

The problem is with

<hx:graphicImageEx   value="#{signatureImage.data}" mimeType="image/*" />

which doesn't display the image represented by byte array .

The strange point is that:

<h:outputText value="#{signatureImage.data[0]}"/>

displays the first byte of the byte array correctly !

and

<hx:graphicImageEx   value="#{signature.imageList[0].data}" mimeType="image/*"  />

displays the first image of the image list correctly !

I don't know if the issue is with the data table or with hx:graphicImageEx !

Please help, I would appreciate any help from you

Thanks
{code}