Stephen wrote:
Daniel Frey wrote:
Timothy,
After a regexp search through my *.java files I find that I've got exactly on component with two constructors. AnimationQueue has one parameter-less and one parameter-ful constructor:
public AnimationQueue() public AnimationQueue(Image backgroundImage)
However, this is not a compnent in Merlins sense as it is not mentioned in any block.xml. It's just a class behind the scenes. Can this be the cause?
Or do you mean two constructors with the same signature?
I need to goo look at the code in detail - but basically what the exception is saying is that there is a component (i.e. a class with an associated .xinfo) that has multiple public constructors. For a number of reasons this is considered to be ambigouse.
Cheers, Stephen.
I've got three .xinfo files in my build tree:
Application.xinfo -- no constructors
HierarchialResourceManagerFacade.xinfo -- no constructors
SimpleSplash.xinfo -- two constructors public SimpleSplash(ImageIcon backgroundImage) public SimpleSplash(ImageIcon backgroundImage, Component component)
I hope the reference to Component is not a framework reference!
Bingo. I think that's the reason: No default constructor or configuraiton to address one of the given constructors (if the second solution is possible).
I'm on the way to transform this class to a Merlin component. However, it needs at least a ImageIcon for the background. How do I handle this with Merlin? Do I need to have a default constructor and an mutator for the backgroundImage property? Why not, seems kind of a proper solution... Except that the Splash may be without background image, which would be nice to be enforced by passing it in the constructor.
You can handle this my defining a custom context entry. Basically you component SimpleSplash declares under either the constructor or under a contextualization method that it needs an entry of the type ImageIcon.
E.g.:
/**
* @avalon.entry key="splash" type="x.u.z.ImageIcon"
*/
public SimpleSplash( Context context )
{
ImageIcon icon = (ImageIcon) context.get( "splash" );
// whatever
}Then in the block (or packaged profile for the component) you declare to merlin how to build your image icon. For details on constructed context entries - take a look at the following example:
http://avalon.apache.org/merlin/starting/tutorial/context/entries.html
Cheers, Stephen.
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