@Column(name="forumImg", unique=false, nullable=true)
	private byte[] forumImg;
	public byte[] getForumImg() {
		return forumImg;
	}
	public void setForumImg(byte[] forumImg) {
		this.forumImg = forumImg;
	}

<p:dataTable id="mistrForumId" value="#{mistrBean.forumList}" var="forumItem" rowKey="#{forumItem.forumId}" 
   selectionMode="single" selection="#{mistrBean.forumUnit}">
   <p:column headerText="Тема форума" width="400px">
   	<h:outputText value="#{forumItem.forumName}"/>
   </p:column>
   <p:column width="200px">
   	<p:graphicImage value="#{mistrBean.retImageContent(forumItem.forumImg)}" width="50px" height="50px">
           <f:param name="id" value="#{forumItem.forumId}" />
	</p:graphicImage>
   </p:column>
... ....

	/** Конвертор байтового потока */
	public DefaultStreamedContent retImageContent(byte[] forumImg){
		System.out.println("forumImg.length=:"+forumImg.length);
		if (FacesContext.getCurrentInstance().getCurrentPhaseId() == PhaseId.RENDER_RESPONSE) {
			return new DefaultStreamedContent();
		}else{
			return new DefaultStreamedContent(new ByteArrayInputStream(forumImg), "image/png");
		}
	}

04:07:51,161 SEVERE [org.primefaces.application.PrimeResourceHandler] (http--127.0.0.1-8080-3) Error in streaming dynamic resource. java.lang.NullPointerException
04:07:51,161 SEVERE [org.primefaces.application.PrimeResourceHandler] (http--127.0.0.1-8080-5) Error in streaming dynamic resource. java.lang.NullPointerException
04:07:51,162 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/customShop].[Faces Servlet]] (http--127.0.0.1-8080-3) Servlet.service() for servlet Faces Servlet threw exception: java.io.IOException: javax.el.ELException: java.lang.NullPointerException