DefaultStreamedContent cannot be cast to java.lang.String

[meinereiner]

Hi,

I just started with PrimeFaces and wanted to that simple example. In my first step I only want to display an image:

Code: Select all

@ManagedBean(name = "dynamicimagecontroller")
@SessionScoped
public class DynamicImageController {

    private StreamedContent image;

    public DynamicImageController() {

        File f = new File("C:/test.jpg");
        if( f.exists()){
            InputStream stream = null;
            try {
                stream = new FileInputStream(f);
                image = new DefaultStreamedContent(stream, "image/jpeg");
            } catch (FileNotFoundException ex) {
                Logger.getLogger(DynamicImageController.class.getName()).log(Level.SEVERE, null, ex);
            } finally {
                try {
                    stream.close();
                } catch (IOException ex) {
                    Logger.getLogger(DynamicImageController.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }

    }

    public StreamedContent getImage() {
        return image;
    }


}

It doesn't matter which way of the InputStream I'm using or where the file is located (inside the project or external) I get every time that error message:

Code: Select all

java.lang.ClassCastException: org.primefaces.model.DefaultStreamedContent cannot be cast to java.lang.String
	at com.sun.faces.renderkit.RenderKitUtils.getImageSource(RenderKitUtils.java:1282)
	at com.sun.faces.renderkit.html_basic.ImageRenderer.encodeEnd(ImageRenderer.java:97)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:878)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:295)
	at com.sun.faces.renderkit.html_basic.TableRenderer.renderRow(TableRenderer.java:380)
	at com.sun.faces.renderkit.html_basic.TableRenderer.encodeChildren(TableRenderer.java:161)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:287)
	at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:106)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
	at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:380)
	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
	at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
	at java.lang.Thread.run(Thread.java:619)

I've found that message already in the forum but only in case with an ImageSwitch.
I only want to use it that way:

Code: Select all

<h:graphicImage value="#{dynamicimagecontroller.image}" />

What am I doing wrong?

meinereiner

[cagatay.civici]

Hi, you need p:graphicImage not h:graphicImage, also I'm not sure if p:imageSwitch supports dynamic images.