a4j:mediaOutput Refresh use Get

[pioug]

Hello,

My code

	<a4j:mediaOutput element="img" cacheable="false" id="imgVignette"
				mimeType="image/jpeg" createContent="#{EventController.paint}"
				value="#{EventController.uploadedFileDate}">
				<f:param value="#{fileUploadBean.timeStamp}" name="time" />

</a4j:mediaOutput>

When i call a refresh

<a4j:commandButton render="imgVignette"

                        value="refreesh upload"></a4j:commandButton>

The call result :

http://127.0.0.1:8080/myapp/rfRes/org.richfaces.resource.MediaOutputResource.html?do=eAF1enc0XN!39tU7o!feiZ7o0bsQvXcm6iijBtEJovcePXqCYGSIEqJ3EsyoUaKNkOjE6!P5fdf3fddvrXffte4f5zx772efe9e5Z-37NBwBWP5QgNzymZt9gL2gh72ns-BzBzewo59M2qTZW5Avrwc6AAR5AwCA5QsFSP8vSsnLywNs7znBAo1YKLpGoQN etc...

but the request was too long, how i can resolve this.

Last version of Richfaces 4

Thanks