If someone will have the same problem in the future, here is the solution: The content I put into value attribute is an object which holds binary data of a image. I want to display a pdf file using JSF and rich faces, using a4j tag library. Can anyone give me a quick how-to?. The a4j:mediaOutput> component implements one of the basic features specified in the framework. The component is a facility for generating images, video.
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ValueExpression must evaluate to java.
This attribute assigns an access key to an element. An access key is a single character from the document character set.
Authors should consider the input method of the expected reader when specifying an accesskey. The possible values are “bottom”, “middle”, “top”, “left” and “right”.
The default value is “middle”. ValueExpression must evaluate to a4n. The default value for this attribute depends on the user agent. Attribute is a flag that defines the caching strategy.
If ‘cacheable’ is set to false, the response will not be cached. If it is set to true, it will be cached and the serialized value of ‘value’ attribute plays the role of a cache key. The attribute specifies shape and it position on the screen. Coordinates are relative to the top left corner of an object. All values are lengths. All values are comma separated. MethodExpression signature must match void createContent java.
Method call expression to send generated resource to OutputStream. It must have two parameter with a medioautput of java. Object deserialized value of data attribute. MethodExpression signature must match void createContentExpression java.
Attribute references to the method that will be used for content creating. The method accepts two parameters. The first parameter has an OutputStream type.
It is a reference to the steam that should be used for output. The second parameter is a reference to a ‘value’ attribute of the component. Direction indication for text that does not inherit directionality. The attribute allows to manage caching and defines the period after which a resource is reloaded. Base language of a resource specified with the href attribute; hreflang may only be mediaoutpyt with href.
The default value is not specified, but is generally a small, non-zero length. The attribute allows to manage caching. A browser can send request with the header “If-Modified-Since” for necessity of object reloading. If time of modification is earlier, then the framework doesn’t call generation and return code The client-side script method to be called when the element loses the focus either when pointing a device or tabbing navigation.
The attribute may be used with the same elements as onfocus. The relationship from the current document to the anchor specified by this hyperlink. The value of this attribute is a space-separated list of link types.
A reverse link from the anchor specified by this hyperlink to the current document. This attribute specifies the shape of a region. The possible values are “default”, “rect”, “circle” and “poly”.
mediaOutput (RichFaces JSF components library Tag library documentation)
Assigns one or more CSS class names to the component. Corresponds to the HTML “class” attribute. This attribute specifies the position of the current element in the tabbing order for z4j current document. This value must be a number between 0 and User agents should ignore leading zeros.
NullPointerExeption and NetworkError 400 (Bad Request) by using a4j:mediaOutput from RichFaces
This attribute specifies the name of a frame where a document is to be opened. By assigning a name to a frame via the name attribute, authors can refer to it as the “target” of links defined by other elements.
Data value calculated at render time and stored in URI also as part of cache Keyat generation time passed to send method. Can be used for update cache at change of generating conditions, and for creating beans as “Lightweight” pattern components request scope. Since serialized data stored in URI, avoid using big objects.