primefaces - 我如何将graphicImage与ViewScoped Bean一起使用？

Question

我有一颗豆子

@ManagedBean
@ViewScoped
public class ProfileBean implements Serializable{
...

private StreamedContent photo2;

public ProfileBean() {

    InputStream iStream = FacesContext.getCurrentInstance().getExternalContext().getResourceAsStream("/resources/images/somePhoto.png");

    photo2 = new DefaultStreamedContent(iStream, "image/png");

    } 
public StreamedContent getPhoto2() {
    return photo2;
}

public void setPhoto2(StreamedContent photo2) {
    this.photo2 = photo2;
}

}

和图形图像

<p:graphicImage value="#{profileBean.photo2}" library="images" width="110" height="150" id="photo" />

图片没有出现/我试过了，就像这里建议的那样

但两个请求都是 RENDER_RESPONSE ...

可能有其他方法，也许没有primefaces？