Dynamic a4j:mediaOutput with Java

[maitscha]

Hi!

I'd like to create a MediaOutput with Java. Here is my code:

HtmlDataList imageList = new HtmlDataList();
imageList.setValueExpression("value", createValueExpression("#{" + beanName + ".dataMap['" + keyString + "'].files}"));
imageList.setVar("file");

... // add some items

// thumbnail
MediaOutput thumbnail = new MediaOutput();
thumbnail.setId(FacesContext.getCurrentInstance().getViewRoot().createUniqueId());
thumbnail.setElement("img");
thumbnail.setCacheable(false);
thumbnail.setSession(true);
thumbnail.setRendered(true);
thumbnail.setValueExpression("value", createValueExpression("#{file.data}"));
thumbnail.setValueExpression("mimeType", createValueExpression("#{file.contentType}"));
thumbnail.setCreateContentExpression(createMethodExpression("#{imagePainter.paintThumbnail}"));

// add to imagelist
imageList.getChildren().add(downloadLink);
imageList.getChildren().add(spacer);
imageList.getChildren().add(deleteLink);
imageList.getChildren().add(thumbnail);

@Name("imagePainter")
@Scope(ScopeType.STATELESS)
public class ImagePainter {

 public void paintThumbnail(OutputStream out, Object data) throws IOException{
 ... // paints the image to out
 }
}

The problem is that the MediaOutput is not rendered and the ImagePainter gets not called.

Any ideas?

Regards, Christoph.

[ilya_shaikovsky]

any errors in server log?

[maitscha]

No errors, only the following in DEBUG mode:

07:52:49,213 DEBUG [RendererBase] Start encoding of component trialDataEditorForm:decoAround1_0:j_id91:1:j_id57 with class org.ajax4jsf.component.html.MediaOutput
07:52:49,213 DEBUG [InternetResourceBuilder] Return instance of internet resource builder org.ajax4jsf.resource.ResourceBuilderImpl@1e220c
07:52:49,213 DEBUG [InternetResourceBuilder] Return instance of internet resource builder org.ajax4jsf.resource.ResourceBuilderImpl@1e220c
07:52:49,230 DEBUG [ResourceBuilderImpl] Build URI for Resource with key [org.ajax4jsf.resource.UserResource/n/s/-1487394660] as : /.../a4j/s/3_2_2.SR1org.ajax4jsf.resource.UserResource/n/s/-1487394660/DATA/eAHsvQdAFMuyMDxkRQVRURQJIiYyS86HDAoiOYlIWDIssCwoCKuioiAgKKAgoJKzZAF....
07:52:49,244 DEBUG [RendererBase] Finish encoding of component trialDataEditorForm:decoAround1_0:j_id91:1:j_id57 with class org.ajax4jsf.component.html.MediaOutput
07:52:49,245 DEBUG [RendererBase] Start encoding of component trialDataEditorForm:decoAround1_0:j_id91:2:j_id94 with class org.richfaces.component.html.HtmlSpacer
07:52:49,245 DEBUG [InternetResourceBuilder] Return instance of internet resource builder org.ajax4jsf.resource.ResourceBuilderImpl@1e220c
07:52:49,245 DEBUG [ResourceBuilderImpl] Build URI for Resource with key [images/spacer.gif] as : /.../a4j/g/3_2_2.SR1images/spacer.gif
07:52:49,246 DEBUG [RendererBase] Finish encoding of component trialDataEditorForm:decoAround1_0:j_id91:2:j_id94 with class org.richfaces.component.html.HtmlSpacer
07:52:49,246 DEBUG [RendererBase] Start encoding of component trialDataEditorForm:decoAround1_0:j_id91:2:j_id56 with class org.ajax4jsf.component.html.HtmlAjaxCommandLink
...

[maitscha]

I have found the answer. The value property must not be too large, so I used a Long for it and now it works.