Minor Description
The error message for indicating missing required component parameters could benefit by making the parameter names stand out from the error message better. For example, failing to bind the "object" parameter of the BeanEditForm component yields the following message:
"Parameter(s) object are required for org.apache.tapestry.corelib.components.BeanEditForm, but have not been bound."
That entire message renders in a uniform, italicized font. It is simple to misread that message though and not realize that the missing parameter name is "object". If "object" were rendered in a non-italicized font, in a fixed-width font, in bold, or any other differentiator to call attention to it, the error message could be greatly enhanced.